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Cap Screws & Bolts
Head, Body & Thread Dimensions
Mechanical and Performance Requirements
Head, Body & Thread Dimensions
Mechanical and Performance Requirements
Hex Lag Screws, Steel, Stainless & Galvanized .......... 73
Step Bolts ...................................................................... 93
Hex Cap Screws
Head & Thread Dimensions (all grades) ................ 74
Grade 2 ............................................................. 74-75
18-8 Stainless Steel .......................................... 74-75
316 Stainless Steel ........................................... 74-75
Grade 5 ............................................................. 76-77
Grade 8 ............................................................. 76-77
Serrated Hex Washer Flange Screws ............................ 94
Structural Bolts, A325 & A490 .............................. 78-81
Plow Bolts
No. 3 Head ............................................................. 98
Grade 5 & 8 ...................................................... 98-99
Clipped Head ....................................................... 100
Tension Control Bolts, A325 .................................. 80-81
Frame Bolts, Grade-8 ................................................... 95
Flange Screws, 12-Point ............................................... 96
T-Head Bolts ................................................................. 97
Heavy Hex Bolts ........................................................... 82
Elevator Bolts ............................................................. 101
Heavy Hex Cap Screws ................................................ 83
Hanger Bolts ............................................................... 102
Hex Machine Bolts, Galvanized ............................. 84-85
Dowel Screws ............................................................. 103
Hex Tap Bolts, Grades 2, 5 & 8 .............................. 86-87
Carriage Bolts
Square Neck, Low Carbon ..................................... 88
Square Neck, Hot-Dip Galvanized ......................... 88
Square Neck, Grade 5 ...................................... 88-89
Square Neck, 18-8 Stainless Steel.................... 88-89
Short Neck, Low Carbon ....................................... 90
Ribbed Neck, Low Carbon ..................................... 91
Fin Neck, Low Carbon ........................................... 92
72
Forged Eyebolts
Plain Pattern ................................................. 104-105
Shoulder Pattern ........................................... 104-105
Slotted Flat Cap Screws .............................................. 106
Square Bolts ................................................................ 107
External Thread Dimensions, Class 2A ...................... 108
Steel, Stainless &
Hot-Dip Galvanized
Bolts & Cap Screws
Lag Screws
‡
L
H
F
S
GIMLET POINT
G
E
ASME B18.2.11996
HEX L AG SCREWS
Basic Product
Diameter
Threads
Per Inch
E
F
G
H
S
Body or
Shoulder
Diameter
Width Across Flats
Width Across
Corners
Head Height
Shoulder
Length
Max
Min
Basic
Max
Min
Max
Min
Basic
Max
Min
Min
No. 10
0.1900
11
0.199
0.178
9/32
0.281
0.271
0.323
0.309
1/8
0.140
0.110
0.094
1/4
0.2500
10
0.260
0.237
7/16
0.438
0.425
0.505
0.484
11/64
0.188
0.150
0.094
5/16
0.3125
9
0.324
0.298
1/2
0.500
0.484
0.577
0.552
7/32
0.235
0.195
0.125
3/8
0.3750
7
0.388
0.360
9/16
0.562
0.544
0.650
0.620
1/4
0.268
0.226
0.125
7/16
0.4375
7
0.452
0.421
5/8
0.625
0.603
0.722
0.687
19/64
0.316
0.272
0.156
1/2
0.5000
6
0.515
0.482
3/4
0.750
0.725
0.866
0.826
11/32
0.364
0.302
0.156
5/8
0.6250
5
0.642
0.605
15/16
0.938
0.906
1.083
1.033
27/64
0.444
0.378
0.312
3/4
0.7500
4-1/2
0.768
0.729
1-1/8
1.125
1.088
1.299
1.240
1/2
0.524
0.455
0.375
7/8
0.8750
4
0.895
0.852
1-5/16
1.312
1.269
1.516
1.447
37/64
0.604
0.531
0.375
Nominal Screw Length
Nominal Screw Size
Thru 6 in.
Over 6 in.
1/2 and smaller
±0.12
±0.25
Over 1/2
±0.25
±0.25
Tolerance on Length
‡Length of a lag screw is measured from the underhead bearing surface to the extreme end of the screw.
Description
A full-bodied bolt with hex head, spaced threads and a gimlet point.
Applications/
Advantages
Steel, Electro-plated Zinc: For use in wood in non-corrosive environments.
Steel, Hot-Dip Galvanized: For use in corrosive environments.
Stainless: Has superior corrosion resistance to galvanized steel bolts.
Material
Steel: AISI 1006 - 1022 or equivalent steel.
Stainless: 18-8 stainless.
Heat Treatment
Stainless: The austenitic alloys develop their strength through work hardening during the fastener manufacturing process, as seen
from the hardness properties below. The only heat treatment normally available on austenitic stainless alloys is annealing, which is
done at approximately 1900°F to a dead soft condition and is not normally thermally reversible.
Hardness
Steel: Rockwell B70 - B100.
Stainless: 1/4 through 1/2 in. diameter-- Rockwell B95 - C32.
Tensile Strength
Steel: 60,000 psi. minimum
Stainless: 100,000 - 125,000 psi. (approximate)
Minimum Thread
Length
The minimum length of thread shall be equal to 1/2 the nominal screw length plus 0.50 in., or 5.00 in., whichever is shorter.
Screws too short for this formula shall be threaded as close to the head as practicable.
Plating
See Appendix-A for information on the plating of steel lag bolts.
73
Head and Thread
Dimensions
Cap Screws & Bolts
H
Hex Cap
Screws
F
H
J
J
E
LT
Y
o
+0
30 -15
G
E
Y
o
+0
30 -15
LT
‡
UNDERSIDE OF HEAD
L
L‡
Cut Thread
Rolled Thread
‡Length of a cap screw is measured from the underhead bearing surface to the extreme end of the screw.
ASME B18.2.11996
HEX CAP SCREWS
E
F
G
Width Across Flats
Width
Across
Corners
H
J
Head Height
Wrenching
Height
Y
LT
Thread Length
Nominal or
Basic Product
Diameter
Body Diameter
Max
Min
Basic
Max
Min
Max
Min
Basic
Max
Min
Transition
Thread
Length
For
Screw
Lengths
≤6 in.
For
Screw
Lengths
> 6 in.
Min
Ref
Ref
Max
1/4
0.2500
0.2500
0.2450
7/16
0.438
0.428
0.505
0.488
5/32
0.163
0.150
0.106
0.750
1.000
0.250
5/16
0.3125
0.3125
0.3065
1/2
0.500
0.489
0.577
0.557
13/64
0.211
.0195
0.140
0.875
1.125
0.278
3/8
0.3750
0.3750
0.3690
9/16
0.562
0.551
0.650
0.628
15/64
0.243
0.226
0.160
1.000
1.250
0.312
7/16
0.4375
0.4375
0.4305
5/8
0.625
0.612
0.722
0.698
9/32
0.291
0.272
0.195
1.125
1.375
0.357
1/2
0.5000
0.5000
0.4930
3/4
0.750
0.736
0.866
0.840
5/16
0.323
0.302
0.215
1.250
1.500
0.385
9/16
0.5625
0.5625
0.5545
13/16
0.812
0.798
0.938
0.910
23/64
0.371
0.348
0.250
1.375
1.625
0.417
5/8
0.6250
0.6250
0.6170
15/16
0.938
0.922
1.083
1.051
25/64
0.403
0.378
0.269
1.500
1.750
0.455
3/4
0.7500
0.7500
0.7410
1-1/8
1.125
1.100
1.299
1.254
15/32
0.483
0.455
0.324
1.750
2.000
0.500
7/8
0.8750
0.8750
0.8660
1-5/16
1.312
1.285
1.516
1.465
35/64
0.563
0.531
0.378
2.000
2.250
0.556
1
1.0000
1.0000
0.9900
1-1/2
1.500
1.469
1.732
1.675
39/64
0.627
0.591
0.416
2.250
2.500
0.625
1-1/8
1.1250
1.1250
1.1140
1-11/16
1.688
1.631
1.949
1.859
11/16
0.718
0.658
0.461
2.500
2.750
0.714
1-1/4
1.2500
1.2500
1.2390
1-7/8
1.875
1.812
2.165
2.066
25/32
0.813
0.749
0.530
2.750
3.000
0.714
1-1/2
1.5000
1.5000
1.4880
2-1/4
2.250
2.175
2.598
2.480
1-5/16
0.974
0.902
0.640
3.250
3.500
0.833
Nominal Screw Length
Nominal
Screw Size
Tolerance on Length
74
Up to 1 in.,
incl.
Over 1 in. to
2-1/2 in., incl.
Over 2-1/2 in.
to 4 in., incl.
Over 4 in. to
6 in., incl.
Longer than 6 in.
1/4 to 3/8
-0.03
-0.04
-0.06
-0.10
-0.18
7/16 and 1/2
-0.03
-0.06
-0.08
-0.10
-0.18
9/16 to 3/4
-0.03
-0.08
-0.10
-0.10
-0.18
7/8 and 1
....
-0.10
-0.14
-0.16
-0.20
1-1/8 to 1-1/2
....
-0.12
-0.16
-0.18
-0.22
Hex Cap Screws, Gr-2,
18-8 & 316 Stainless
Mechanical & Bolts & Cap Screws
Performance Data
**
x
GRADE-2 HEX CAP SCREW
Description
A low or medium carbon steel, externally threaded mechanical device 1/4" diameter or larger, with a trimmed hex head and a
washer face on the bearing surface.
Applications/
Advantages
Economical for use in non-critical applications where the fastener is not subject to extreme temperatures or stress beyond the limits
listed herein.
Material
AISI 1006 - 1050 or equivalent steel.
Hardness
1/4 through 3/4 in. diameter, 6 in. and shorter in length: Rockwell B80 - B100.
1/4 through 3/4 in. diameter, over 6 in. in length: Rockwell B70 - B100.
7/8 through 1-1/2 in. diameter, all lengths: Rockwell B70 - B100.
Proof Load
1/4 through 3/4 in. diameter, 6 in. and shorter in length: 55,000 psi.
1/4 through 3/4 in. diameter, over 6 in. in length: 33,000 psi.
7/8 through 1-1/2 in. diameter, all lengths: 33,000 psi.
Yield Strength*
1/4 through 3/4 in. diameter, 6 in. and shorter in length: 57,000 psi. minimum.
1/4 through 3/4 in. diameter, over 6 in. in length: 36,000 psi. minimum.
7/8 through 1-1/2 in. diameter, all lengths: 36,000 psi. minimum.
Tensile Strength
1/4 through 3/4 in. diameter, 6 in. and shorter in length: 74,000 psi. minimum.
1/4 through 3/4 in. diameter, over 6 in. in length: 60,000 psi. minimum.
7/8 through 1-1/2 in. diameter, all lengths: 60,000 psi. minimum.
Elongation*
18% minimum (all diameters)
Reduction of Area*
35% minimum (all sizes)
Plating
See Appendix-A for plating information
x
F5
**
9 3-C
x
HEX CAP SCREW--STAINLESS STEEL, 18-8 & 316
F5
**
9 3-G
Description
18-8 and 316 stainless steel cap screws are both made from austenitic alloys as described below.
Applications/
Advantages
18-8: Used in products that require general atmospheric corrosion resistance, such as chemical and food-processing equipment.
Some chemical environments may require special corrosion resistant materials and precautions.
316: The molybdenum content gives this type of stainless even greater corrosion resistance than 18-8 as well as superior strength
at high temperatures.
Material
18-8: A cap screw made from one of the following austenitic alloys: 303, 303Se, 304, XM7, all of which are characterized as having
a chromium content of 17-19% and nickel content of 8-10%.
316: A cap screw made from 316 stainless steel, an austenitic alloy which differs from 18-8 by its molybdenum content (2-3%) and
a higher nickel content (10-14%).
Heat Treatment
The austenitic alloys develop their strength through work hardening during the fastener manufacturing process, as seen from the
hardness properties below. The only heat treatment normally available on austenitic stainless alloys is annealing, which is done at
approximately 1900°F to a dead soft condition and is not normally thermally reversible.
Hardness
1/4 through 5/8 in. diameter: Rockwell B95 - C32
3/4 through 1 in. diameter: Rockwell B80 - C32
Yield Strength*
1/4 through 5/8 in. diameter, 2.25D and longer: 65,000 psi. minimum
3/4" (2.25D & longer) & 7/8 through 1 in. diameter (3D & longer): 45,000 psi. minimum
Tensile Strength
1/4 through 5/8 in. diameter, 2.25D and longer: 100,000 - 150,000 psi.
3/4" (2.25D & longer) & 7/8 through 1 in. diameter (3D & longer): 85,000 - 140,000 psi.
Elongation in 4D*
1/4 through 5/8 in. diameter: 20% minimum; 3/4 through 1 in. diameter: 25% minimum.
D = Nominal diameter of the screw in inches
*These properties are tested only on machined specimens when the testing machine cannot provide for full testing of the parts.
**Product standards require the manufacturer’s head marking to appear on the top of all cap screws 1/4” diameter and larger. “X” represents one location such a marking may appear.
75
Head and Thread
Dimensions
Cap Screws & Bolts
H
Grades-5 & 8
Cap Screws
F
H
J
J
E
G
E
LT
Y
o
+0
30 -15
Y
o
+0
30 -15
LT
L‡
‡
L
Cut Thread
UNDERSIDE OF HEAD
Rolled Thread
‡Length of a cap screw is measured from the underhead bearing surface to the extreme end of the screw.
ASME B18.2.11996
HEX CAP SCREWS
E
F
G
Width Across Flats
Width
Across
Corners
H
J
Head Height
Wrenching
Height
Y
LT
Thread Length
Nominal or
Basic Product
Diameter
Body Diameter
For
Screw
Lengths
≤6 in.
For
Screw
Lengths
> 6 in.
Transition
Thread
Length
Max
Min
Basic
Max
Min
Max
Min
Basic
Max
Min
Min
Ref
Ref
Max
1/4
0.2500
0.2500
0.2450
7/16
0.438
0.428
0.505
0.488
5/32
0.163
0.150
0.106
0.750
1.000
0.250
5/16
0.3125
0.3125
0.3065
1/2
0.500
0.489
0.577
0.557
13/64
0.211
.0195
0.140
0.875
1.125
0.278
3/8
0.3750
0.3750
0.3690
9/16
0.562
0.551
0.650
0.628
15/64
0.243
0.226
0.160
1.000
1.250
0.312
7/16
0.4375
0.4375
0.4305
5/8
0.625
0.612
0.722
0.698
9/32
0.291
0.272
0.195
1.125
1.375
0.357
1/2
0.5000
0.5000
0.4930
3/4
0.750
0.736
0.866
0.840
5/16
0.323
0.302
0.215
1.250
1.500
0.385
9/16
0.5625
0.5625
0.5545
13/16
0.812
0.798
0.938
0.910
23/64
0.371
0.348
0.250
1.375
1.625
0.417
5/8
0.6250
0.6250
0.6170
15/16
0.938
0.922
1.083
1.051
25/64
0.403
0.378
0.269
1.500
1.750
0.455
3/4
0.7500
0.7500
0.7410
1-1/8
1.125
1.100
1.299
1.254
15/32
0.483
0.455
0.324
1.750
2.000
0.500
7/8
0.8750
0.8750
0.8660
1-5/16
1.312
1.285
1.516
1.465
35/64
0.563
0.531
0.378
2.000
2.250
0.556
1
1.0000
1.0000
0.9900
1-1/2
1.500
1.469
1.732
1.675
39/64
0.627
0.591
0.416
2.250
2.500
0.625
1-1/8
1.1250
1.1250
1.1140
1-11/16
1.688
1.631
1.949
1.859
11/16
0.718
0.658
0.461
2.500
2.750
0.714
1-1/4
1.2500
1.2500
1.2390
1-7/8
1.875
1.812
2.165
2.066
25/32
0.813
0.749
0.530
2.750
3.000
0.714
1-1/2
1.5000
1.5000
1.4880
2-1/4
2.250
2.175
2.598
2.480
1-5/16
0.974
0.902
0.640
3.250
3.500
0.833
Nominal Screw Length
Nominal
Screw Size
Tolerance on Length
76
Up to 1 in.,
incl.
Over 1 in. to
2-1/2 in., incl.
Over 2-1/2 in.
to 4 in., incl.
Over 4 in. to
6 in., incl.
Longer than 6 in.
1/4 to 3/8
-0.03
-0.04
-0.06
-0.10
-0.18
7/16 and 1/2
-0.03
-0.06
-0.08
-0.10
-0.18
9/16 to 3/4
-0.03
-0.08
-0.10
-0.10
-0.18
7/8 and 1
....
-0.10
-0.14
-0.16
-0.20
1-1/8 to 1-1/2
....
-0.12
-0.16
-0.18
-0.22
Grades 5 & 8
Cap Screws
Mechanical &
Performance Data
Bolts & Cap Screws
**
GRADE-5 HEX CAP SCREW
x
Description
A cap screw made from medium carbon steel and heat-treated.
Applications/
Advantages
Has greater tensile strength than a Grade-2. Yield-to-tensile ratio is the lowest of all heat treated steels.
Heat Treatment
Grade-5 cap screws shall be heat treated, oil or water quenched, at the option of the manufacturer, and tempered at a minimum
tempering temperature of 800°F.
Material
Medium carbon steel. Use of an alloy steel is also acceptable.
Core Hardness
1/4 through 1 in. diameter, all lengths: Rockwell C25 - C34.
1-1/8 through 1-1/2 in. diameter, all lengths: Rockwell C19 - C30.
Surface Hardness
1/4 through 1 in. diameter, all lengths: Rockwell 30N54 maximum.
1-1/8 through 1-1/2 in. diameter, all lengths: Rockwell 30N50 maximum.
Proof Load
1/4 through 1 in. diameter, all lengths: 85,000 psi.
1-1/8 through 1-1/2 in. diameter, all lengths: 74,000 psi.
Yield Strength*
1/4 through 1 in. diameter, all lengths: 92,000 psi. minimum
1-1/8 through 1-1/2 in. diameter, all lengths: 81,000 psi. minimum
Tensile Strength
1/4 through 1 in. diameter, all lengths: 120,000 psi. minimum
1-1/8 through 1-1/2 in. diameter, all lengths: 105,000 psi. minimum
Elongation*
14% minimum (all diameters)
Reduction of Area*
35% minimum (all sizes)
Plating
See Appendix-A for plating information.
**
GRADE-8 HEX CAP SCREW
x
Description
A cap screw made from medium carbon alloy steel and heat-treated.
Applications/
Advantages
Has greater tensile strength than a Grade-5. Designed for use in high stress applications. See specifications below for more
information on how the Grade-8 exceeds the strength of a Grade-5.
Heat Treatment
Grade-8 cap screws shall be heat-treated, oil-quenched and tempered at a minimum temperature of 800°F.
Material
Medium carbon alloy steel. Note: For diameters 1/4 through 7/16 inch, it is permissible to use AISI 1541 steel.
Core Hardness
1/4 through 1-1/2 in. diameter, all lengths: Rockwell C33 - C39.
Surface Hardness
1/4 through 1-1/2 in. diameter, all lengths: Rockwell 30N58.6 maximum.
Proof Load
1/4 through 1-1/2 in. diameter, all lengths: 120,000 psi.
Yield Strength*
1/4 through 1-1/2 in. diameter, all lengths: 130,000 psi. minimum
Tensile Strength
1/4 through 1-1/2 in. diameter, all lengths: 150,000 psi. minimum
Elongation*
12% minimum (all diameters)
Reduction of Area*
35% minimum (all sizes)
Plating
See Appendix-A for plating information.
*These properties are tested only on machined specimens when the testing machine cannot provide for full testing of the parts.
**Product standards require the manufacturer’s head marking to appear on the top of all cap screws 1/4” diameter and larger. “X” represents one location such a marking may appear.
77
Head and Thread
Dimensions
Cap Screws & Bolts
H
A325 & A490
Structural Bolts
F
H
R
R
E
LT
Y
o
+0
30 -15
G
E
Y
o
+0
30 -15
LT
‡
L
‡
L
Cut Thread
Rolled Thread
‡Length of a structural bolt is measured from the underhead bearing surface to the extreme end of the bolt.
ASME 18.2.61996
STRUCTURAL BOLTS, A325 & A490
E
Nominal Size
or Basic
Product
Diameter
F
Body Diameter
Max
Min
G
Width Across Flats
H
Width Across
Corners
Basic
Max
Min
Max
Min
R
Radius of
Fillet
Head Height
Basic
Max
LT
Min
Max
Y
TransiThread
tion
Length Thread
Length
Min
Ref
Max,
Ref
1/2
0.5000
0.515
0.482
7/8
0.875
0.850
1.010
0.969
5/16
0.323
0.302
0.031
0.009
1.00
0.19
5/8
0.6250
0.642
0.605
1-1/16
1.062
1.031
1.227
1.175
25/64
0.403
0.378
0.062
0.021
1.25
0.22
3/4
0.7500
0.768
0.729
1-1/4
1.250
1.212
1.443
1.383
15/32
0.483
0.455
0.062
0.021
1.38
0.25
7/8
0.8750
0.895
0.852
1-7/16
1.438
1.394
1.660
1.589
35/64
0.563
0.531
0.062
0.031
1.50
0.28
1
1.0000
1.022
0.976
1-5/8
1.625
1.575
1.876
1.796
39/64
0.627
0.591
0.093
0.062
1.75
0.31
1 1/8
1.1250
1.149
1.098
1-13/16
1.812
1.756
2.093
2.002
11/16
0.718
0.658
0.093
0.062
2.00
0.34
1 1/4
1.2500
1.277
1.223
2
2.000
1.938
2.309
2.209
25/32
0.813
0.749
0.093
0.062
2.00
0.38
1 3/8
1.3750
1.404
1.345
2-3/16
2.188
2.119
2.526
2.416
27/32
0.878
0.810
0.093
0.062
2.25
0.44
1 1/2
1.5000
1.531
1.470
2-3/8
2.375
2.300
2.742
2.622
15/16
0.974
0.902
0.093
0.062
2.25
0.44
Nominal Screw Length
Nominal Screw Size
Tolerance on Length
78
Through 6 in.
Over 6 in.
1/2
-0.12
-0.19
5/8
-0.12
-0.25
3/4 through 1
-0.19
-0.25
1 1/8 through 1 1/2
-0.25
-0.25
A325 & A490
Structural Bolts
Mechanical &
Performance Data
Bolts & Cap Screws
**
**
A325
x
ASTM A325 BOLTS, Type 1
A325
x
Description
A heavy hex bolt made of medium carbon steel. The bearing surface shall be flat and washer faced, and the point is chamfered.
Applications/
Advantages
Commonly used in structural steel joints in heavy construction.
Material
Type 1 bolts shall be made from a carbon steel which conforms to the following chemical composition requirements-Carbon: 0.25-0.58%; Manganese: 0.57% minimum; Phosphorus: 0.048% maximum; Sulfur: 0.058% maximum
Heat Treatment
Type 1 bolts shall be heat treated by quenching in a liquid medium from above the austenitizing temperature and then tempering by
reheating to a temperature of at least 800°F.
Hardness
1/2" through 1" diameter, inclusive: Rockwell C24 - 35
1-1/8" through 1-1/2" diameter, inclusive: Rockwell C19 - 31
Proof Load
1/2" through 1" diameter, inclusive: 85,000 psi.
1-1/8" through 1-1/2" diameter, inclusive: 74,000 psi.
Yield Strength
1/2" through 1" diameter, inclusive: 92,000 psi. minimum
1-1/8" through 1-1/2" diameter, inclusive: 81,000 psi. minimum
Tensile Strength
1/2" through 1" diameter, inclusive: 120,000 psi. minimum
1-1/8" through 1-1/2" diameter, inclusive: 105,000 psi. minimum
Plating
See Appendix-A for plating information.
**
A490
x
**
ASTM A490 BOLTS, Types 1 & 3
Type 1
A490
x
Type 3
Description
A heavy hex bolt made of alloy steel. The bearing surface shall be flat and washer-faced, and the point is chamfered.
Applications/
Advantages
Used in structural steel joints in heavy construction when greater yield and tensile strengths than those of an A325 bolt are required. A
Type 3 bolt is approximately twice as resistant to corrosion as a Type 1 bolt.
Material
Type 1 bolts shall be made from an alloy steel which conforms to the following chemical composition requirements-Carbon: 0.28-0.50% (for 1-1/2" diameter: 0.33-0.55%); Phosphorus: 0.045% maximum; Sulfur: 0.045% maximum.
Type 3 bolts shall be made from a corrosion resistant steel which conforms to the following chemical composition requirements-- Carbon:
0.19-0.55%; Manganese: 0.37% minimum; Phosphorus: 0.045% maximum; Sulfur: 0.055% maximum; Copper: 0.63% maximum;
Chromium: 0.42% minimum; Nickel: 0.17% minimum; Molybdenum: 0.14% minimum.
Heat Treatment
Type 1 bolts shall be heat treated by quenching in oil from above the transformation temperature. Type 3 bolts shall be quenched in a
suitable liquid from above the transformation temperature. Type 1 and Type 3 bolts shall be tempered by reheating to a temperature of at
least 800°F.
Hardness
Rockwell C33 - 38
Proof Load
120,000 psi.
Yield Strength
130,000 psi. minimum
Tensile Strength
150,000 - 170,000 psi.
Plating
See Appendix-A for plating information.
**Product standards require the manufacturer’s head marking to appear on the top of all cap screws 1/4” diameter and larger. “X” represents one location such a marking may appear.
79
Tension Control
Bolts
Cap Screws & Bolts
A325
H
D
R
IF
C
C
E
A
325T
LT
Y
L
DIMENSIONS OF H IGH S TRENGTH T ENSION C ONTROL BOLTS
Nominal
Bolt Size
E
D
H
Body Diameter
Dia. of Bearing
Surface
Height
R
LT
Y
Radius of Fillet
Thread
Length
(Ref)
Trans.
Thread
Length
(Ref)
Max.
Min
Max.
Min.
Basic
Max.
Min.
Max.
Min
Basic
Max.
5/8
0.642
0.605
1.181
1.102
25/64
0.403
0.378
0.062
0.021
1.25
0.22
3/4
0.768
0.729
1.417
1.338
15/32
0.483
0.455
0.062
0.021
1.38
0.25
7/8
0.895
0.852
1.654
1.535
35/64
0.563
0.531
0.062
0.031
1.50
0.28
1
1.022
0.976
1.900
1.771
39/64
0.627
0.591
0.093
0.062
1.75
0.31
HEAVY H EX NUTS USED WITH T ENSION CONTROL BOLTS
Nominal
Nut Size
F
G
H
Width Across Flats
Width Across
Corners
Height
F
Basic
Max.
Min.
Max.
Min.
Basic
Max.
Min.
5/8
1-1/16
1.062
1.031
1.227
1.175
39/64
0.631
0.587
3/4
1-1/41
1.250
1.212
1.443
1.382
47/64
0.758
0.710
7/8
1-7/16
1.438
1.394
1.660
1.589
55/64
0.885
0.833
1
1-5/8
1.625
1.575
1.876
1.796
63/64
1.012
0.956
H
G
WASHERS USED W ITH TENSION CONTROL BOLTS
Nominal
Bolt Size
80
t
D
d
t
Outside Diameter
Diameter of Hole
Thickness
Nom.
Tolerances
Nom.
Tolerances
Max.
Min.
5/8
1-5/16
- 1/32: + 1/4
11/16
- 0: + 1/32
0.177
0.122
3/4
1-15/32
- 1/32: + 1/4
13/16
- 0: + 1/32
0.177
0.122
7/8
1-3/4
- 1/32: + 1/4
15/16
- 0: + 1/32
0.177
0.136
1
2
- 1/32: + 1/4
1-1/8
- 0: + 1/32
0.177
0.136
D
d
Tension Control
Bolts
A325
Bolts & Cap Screws
Description
A three piece fastening sustem consisting of: 1) a round-head bolt with a truncated, flat surface area at the top of the bolt, and a 24sided tip which protrudes from the opposite end. The tip is calibrated to shear off when the proper tension is achieved; 2) a 2H heavy
hex nut; and 3) a structural flat washer.
Applications/
Advantages
Commonly used in structural steel joints in heavy construction. Has several advantages over traditional structural bolts, including: A) no
operator or tool can over torque the fastening, B) the fastening can be visually inspected—when the tip is gone, the tension is correct; C)
installation is faster, easier and can be done by one person; D) installation process is quiter.
Component
Bolt
Material
Type 1 bolts shall be made from a carbon steel
which conforms to the following chemical
composition requirements-Carbon: 0.25-0.58%; Manganese: 0.60%
minimum; Phosphorus: 0.048% maximum;
Sulfur: 0.058% maximum
Heat Treatment
Type 1 bolts shall be heat treated by quenching
in a liquid medium from above the austenitizing
temperature and then tempering by reheating to
a temperature of at least 800°F.
2H nuts shall be heat treated to meet the
required mechanical properties.
Washers shall be through hardened.
Hardness
5/8" through 1" diameter, inclusive: Rockwell
C24 - 35
Rockwell C24 - 38
Rockwell C38 - 45
Proof Load
5/8" through 1" diameter, inclusive: 85,000 psi.
175,000 psi.
-
Yield Strength
5/8" through 1" diameter, inclusive: 92,000 psi.
minimum
-
-
Tensile Strength
5/8" through 1" diameter, inclusive: 120,000
psi. minimum
-
-
Plating
Nut
Washer
2H nuts shall be made from a carbon steel
Type 1 washers shall be made from
which conforms to the following chemical
a steel which conforms to the
composition requirements-- Carbon: 0.40%
following chemical composition
requirements: Phosphorus: 0.050%
minimum; Manganese: 1.00% maximum;
Phosphorus: 0.040% maximum; Sulfur: 0.050%
maximum; Sulfur: 0.060%
maximum; Silicon: 0.040% maximum
maximum
All components are most commonly used plain, without any secondary finish other than oil.
INSTALLATION PROCEDURE
Place the bolt into
the connection
with the washer
under the nut.
Slide the inner
socket over the
bolt tip and the
outer socket over
the nut. Press the
trigger switch.
The outer socket
will rotate and
tighten the nut
until the bolt
reaches the required tension.
When the proper
bolt tension is
reached, the tip of
the bolt will shear.
When the tip of the
bolt shears, pull
back on the
wrench until the
outer socket is no
longer engaging
the nut.
Push the ejector
lever to discharge
the severed bolt
tip.
81
Cap Screws & Bolts
H
F
H
R
R
E
G
E
LT
o
+0
30 -15
Type A307
Grades A & B
Heavy Hex Bolts
LT
o
+0
30 -15
LG
L
L
Cut Thread
UNDERSIDE OF HEAD
Rolled Thread
ASME B18.2.11996
HEAVY HEX BOLTS
E
Nominal Size
or Basic
Product
Diameter
1/2
0.5000
F
Body Diam
G
Width Across Flats
H
Width Across
Corners
R
LT
Radius of
Fillet
Head Height
Thread Length
for Bolt
Lengths
6 in. and
shorter
Over
6 in.
Max
Min
Basic
Max
Min
Max
Min
Basic
Max
Min
Max
Min
Basic
Basic
0.515
0.482
7/8
0.875
0.850
1.010
0.969
11/32
0.364
0.302
0.03
0.01
1.250
1.500
1.750
5/8
0.6250
0.642
0.605
1-1/16
1.062
1.031
1.227
1.175
27/64
0.444
0.378
0.06
0.02
1.500
3/4
0.7500
0.768
0.729
1-1/4
1.250
1.212
1.443
1.383
1/2
0.524
0.455
0.06
0.02
1.750
2.000
7/8
0.8750
0.895
0.852
1-7/16
1.438
1.394
1.660
1.589
37/64
0.604
0.531
0.06
0.02
2.000
2.250
1
1.0000
1.022
0.976
1-5/8
1.625
1.575
1.876
1.796
43/64
0.700
0.591
0.09
0.03
2.250
2.500
2.750
1 1/8
1.1250
1.149
1.098
1-13/16
1.812
1.756
2.093
2.002
3/4
0.780
0.658
0.09
0.03
2.500
1 1/4
1.2500
1.277
1.223
2
2.000
1.938
2.309
2.209
27/32
0.876
0.749
0.09
0.03
2.750
3.000
1 3/8
1.3750
1.404
1.345
2-3/16
2.188
2.119
2.526
2.416
29/32
0.940
0.810
0.09
0.03
3.000
3.250
1 1/2
1.5000
1.531
1.470
2-3/8
2.375
2.300
2.742
2.622
1
1.036
0.902
0.09
0.03
3.250
3.500
1 3/4
1.7500
1.785
1.716
2-3/4
2.750
2.662
3.175
3.035
1-5/32
1.196
1.054
0.12
0.04
3.750
4.000
2
2.0000
2.039
1.964
3-1/8
3.125
3.025
3.608
3.449
1-11/32
1.388
1.175
0.12
0.04
4.250
4.500
2 1/4
2.2500
2.305
2.214
3-1/2
3.500
3.388
4.041
3.862
1-1/2
1.548
1.327
0.19
0.06
4.750
5.000
2 1/2
2.5000
2.559
2.461
3-7/8
3.875
3.750
4.474
4.275
1-21/32
1.708
1.479
0.19
0.06
5.250
5.500
2 3/4
2.7500
2.827
2.711
4-1/4
4.250
4.112
4.907
4.688
1-13/16
1.869
1.632
0.19
0.06
5.750
6.000
3
3.0000
3.081
2.961
4-5/8
4.625
4.475
5.340
5.102
2
2.060
1.815
0.19
0.06
6.250
6.500
Nominal Screw Length
Nominal Screw Size
1/4 to 3/8
Tolerance on Length
Up to 1 in., incl.
Over 1 in. to
2 1/2 in., incl.
+0.02
+0.02
-0.04
+0.04
-0.06
+0.06
-0.10
+0.10
-0.18
-0.03
Over 2 1/2 in. to
4 in., incl.
Over 4 in. to
6 in., incl.
Longer than 6 in.
7/16 and 1/2
+0.02
-0.03
+0.04
-0.06
+0.06
-0.08
+0.08
-0.10
+0.12
-0.18
9/16 to 3/4
+0.02
-0.03
+0.06
-0.08
+0.08
-0.10
+0.10
-0.10
+0.14
-0.18
7/8 and 1
....
....
+0.08
-0.10
+0.10
-0.14
+0.12
-0.16
+0.16
-0.20
1 1/8 to 1 1/2
....
....
+0.12
-0.12
+0.16
-0.16
+0.18
-0.18
+0.22
-0.22
Over 1-1/2
....
....
+0.18
-0.18
+0.20
-0.20
+0.22
-0.22
+0.24
-0.24
Description
A low carbon steel hex bolt with a wider head than that of a standard hex bolt.
Applications/
Advantages
Offers greater wrenching area than standard hex machine bolts for use in heavy duty industrial work.
Material
Bolts shall be made from a carbon steel which conforms to the following chemical composition requirements-Grade A-- Phosphorus: 0.06% maximum; Sulfur: 0.15% maximum. Grade B-- Phosphorus: 0.04% maximum; Sulfur: 0.05% maximum
Hardness*
Bolts less than 3 times diameter in length: Grade A: Rockwell B69 - 100; Grade B: Rockwell B69 - 95;
Bolts 3 times diameter and longer: Grade A: Rockwell B100 maximum Grade B: Rockwell B69 - 95
Tensile Strength
Grade A: 60,000 psi. minimum; Grade B: 60,000 - 100,000 psi.
Elongation in 2 in.
18% minimum
Plating
See Appendix-A for plating information.
82
Heavy Hex
Cap Screws
Bolts & Cap Screws
H
H
F
W
W
E
LT
S
o
+0
30 -15
G
E
S
o
+0
30 -15
LT
L
L
Cut Thread
UNDERSIDE OF HEAD
Rolled Thread
ASME B18.2.11996
HEAVY HEX CAP S CREWS
E
Nominal Size or
Basic Product
Diameter
F
Body Diameter
G
Width Across
Flats
H
Width Across
Corners
W
Head Height
LT
S
Thread Length for
Wrench- Screw Lengths
ing
6 in. and Over
Height
shorter
6 in.
Transition
Thread
Length
Max
Min
Max
Min
Max
Min
Max
Min
Min
Basic
Basic
Max
1/2
0.5000
0.5000
0.482
0.875
0.850
1.010
0.969
0.323
0.302
0.215
1.250
1.500
0.385
5/8
0.6250
0.6250
0.605
1.062
1.031
1.227
1.175
0.403
0.378
0.269
1.500
1.750
0.455
3/4
0.7500
0.7500
0.729
1.250
1.212
1.443
1.383
0.483
0.455
0.324
1.750
2.000
0.500
7/8
0.8750
0.8750
0.852
1.438
1.394
1.660
1.589
0.563
0.531
0.378
2.000
2.250
0.556
1
1.0000
1.0000
0.976
1.625
1.575
1.876
1.796
0.627
0.591
0.416
2.250
2.500
0.625
1 1/8
1.1250
1.1250
1.098
1.812
1.756
2.093
2.002
0.718
0.658
0.461
2.500
2.750
0.714
1 1/4
1.2500
1.2500
1.223
2.000
1.938
2.309
2.209
0.813
0.749
0.530
2.750
3.000
0.714
1 3/8
1.3750
1.3750
1.345
2.188
2.119
2.526
2.416
0.878
0.810
0.569
3.000
3.250
0.833
1 1/2
1.5000
1.5000
1.470
2.375
2.300
2.742
2.622
0.974
0.902
0.640
3.250
3.500
0.833
1 3/4
1.7500
1.7500
1.716
2.750
2.662
3.175
3.035
1.134
1.054
0.748
3.750
4.000
1.000
2
2.0000
2.0000
1.964
3.125
3.025
3.608
3.449
1.263
1.175
0.825
4.250
4.500
1.111
2 1/4
2.2500
2.2500
2.214
3.500
3.388
4.041
3.862
1.423
1.327
0.933
...
5.000
1.111
2 1/2
2.5000
2.5000
2.461
3.875
3.750
4.474
4.275
1.583
1.479
1.042
...
5.500
1.250
2 3/4
2.7500
2.7500
2.711
4.250
4.112
4.907
4.688
1.744
1.632
1.151
...
6.000
1.250
3
3.0000
3.0000
2.961
4.625
4.475
5.340
5.102
1.935
1.815
1.290
...
6.500
1.250
Nominal Screw
Size
Tolerance on
Length
Nominal Screw Length
Up to 1 in., incl.
Over 1 in. to
2 1/2 in., incl.
Over 2 1/2 in. to
4 in., incl.
Over 4 in. to
6 in., incl.
Longer than 6 in.
1/4 to 3/8
+0.02
-0.03
+0.02
-0.04
+0.04
-0.06
+0.06
-0.10
+0.10
-0.18
7/16 and 1/2
+0.02
-0.03
+0.04
-0.06
+0.06
-0.08
+0.08
-0.10
+0.12
-0.18
9/16 to 3/4
+0.02
-0.03
+0.06
-0.08
+0.08
-0.10
+0.10
-0.10
+0.14
-0.18
7/8 and 1
....
....
+0.08
-0.10
+0.10
-0.14
+0.12
-0.16
+0.16
-0.20
1 1/8 to 1 1/2
....
....
+0.12
-0.12
+0.16
-0.16
+0.18
-0.18
+0.22
-0.22
Description
A low carbon steel hex cap screw with a wider head than that of a standard hex cap screw.
Applications/
Advantages
Offers greater wrenching area than standard hex cap screws and more consistent body diameter dimensions than heavy hex bolts
(the following specifications pertain to Grade-2 heavy hex cap screws; performance requirements for grades 5 & 8 are on page 63).
Material
Grade-2 heavy hex cap screws shall be made from a carbon steel which conforms to the following chemical composition
requirements-- Carbon: 0.55% maximum; Phosphorus: 0.048% maximum; Sulfur: 0.058% maximum
Hardness*
Rockwell B80 - 100
Tensile Strength
74,000 psi. minimum
Proof Load
55,000 psi.
Elongation in 2 in.
18% minimum
Plating
See Appendix-A for plating information.
83
Cap Screws & Bolts
H
F
H
R
R
E
o
+0
30 -15
Hex Machine
Bolts
Hot Dip Galvanized
G
E
LT
LG
o
+0
30 -15
‡
LT
L
L‡
Cut Thread
UNDERSIDE OF HEAD
Rolled Thread
‡Length of a machine bolt is measured from the underhead bearing surface to the extreme end of the bolt.
ASME B18.2.11996
HEX MACHINE BOLTS
E
Nominal
Size Or
Basic
Diameter
F
G
H
R
LT
Thread Length
For Bolt Lengths
Body Diameter
Width Across
Corners
Width Across Flats
Radius of
Fillet
Head Height
6 in.
and
shorter
over
6 in.
Max.
Min.
Basic
Max.
Min.
Max.
Min.
Basic
Max.
Min.
Max.
Min.
Basic
Basic
1/4 0.2500
0.260
0.237
7/16
0.438
0.425
0.505
0.484
11/64
0.188
0.150
0.03
0.01
0.750
1.000
5/16 0.3125
0.324
0.298
1/2
0.500
0.484
0.577
0.552
7/32
0.235
0.195
0.03
0.01
0.875
1.125
3/8 0.3750
0.388
0.360
9/16
0.562
0.544
0.650
0.620
1/4
0.268
0.226
0.03
0.01
1.000
1.250
1/2 0.5000
0.515
0.482
3/4
0.750
0.725
0.866
0.826
11/32
0.364
0.302
0.03
0.01
1.250
1.500
5/8 0.6250
0.642
0.605
15/16
0.938
0.906
1.083
1.033
27/64
0.444
0.378
0.06
0.02
1.500
1.750
3/4 0.7500
0.768
0.729
1-1/8
1.125
1.088
1.299
1.240
1/2
0.524
0.455
0.06
0.02
1.750
2.000
7/8 0.8750
0.895
0.852
1-5/16
1.312
1.269
1.516
1.447
37/64
0.604
0.531
0.06
0.02
2.000
2.250
1
1.022
0.976
1-1/2
1.500
1.450
1.732
1.653
43/64
0.700
0.591
0.09
0.03
2.250
2.500
1.0000
Nominal Screw Length
Nominal Screw Size
Tolerance on Length
84
Up to1 in., incl.
Over 1 in. to
2-1/2 in., incl.
Over 2-1/2 in. to
4 in., incl.
Over 4 in. to
6 in., incl.
Longer than 6 in.
1/4 to 3/8
+0.02, -0.03
+0.02, -0.04
+0.04, -0.06
+0.06, -0.10
+0.10, -0.18
7/16 and 1/2
+0.02, -0.03
+0.04, -0.06
+0.06, -0.08
+0.08, -0.10
+0.12, -0.18
9/16 to 3/4
+0.02, -0.03
+0.06, -0.08
+0.08, -0.10
+0.10, -0.10
+0.14, -0.18
7/8 and 1
...
+0.08, -0.10
+0.10, -0.14
+0.12, -0.16
+0.16, -0.20
Hex Machine
Bolts
Hot Dip Galvanized
Bolts & Cap Screws
**
x
Description
A low or medium carbon steel, externally threaded mechanical device, 1/4 inch in diameter or larger, with a trimmed hex head and
a hot-dip galvanized coating. A hex bolt does not have a washer face on its bearing surface as does a hex cap screw, nor does it
have a machined point. Its body tolerances are not as close as those of a cap screw.
Applications/
Advantages
Designed to be used in highly corrosive environments (ie. coastal locales and heavily polluted atmospheres). May be inserted into
an oversized hole and should be assembled with a nut.
Material
Machine bolts shall be manufactured from steel which conforms to the following chemical composition requirements:
Phosphorus: 0.06% maximum; Sulfur: 0.15% maximum.
Hardness
Bolts of a length < 3X nominal diameter: Rockwell B69 - B100.
Bolts of a length => 3X nominal diameter: Rockwell B100 maximum.
Tensile Strength
60,000 psi. minimum.
Elongation*
18% minimum (all diameters)
Plating
See Appendix-A for plating information.
*These properties are tested only on machined specimens when the testing machine cannot provide for full testing of the parts.
**Product standards require the manufacturer’s head marking to appear on the top of all bolts 1/4” diameter and larger. “X” represents one location such a marking may appear.
85
Cap Screws & Bolts
Hex Tap Bolts
L‡
Grades 2, 5 & 8
F
H
G
Not all Tap Bolts have a washer face.
UNDERSIDE OF HEAD
‡Length of a tap bolt is measured from the underhead bearing surface to the extreme end of the bolt.
ASME
B18.2.1-1996
F ULLY THREADED HEX TAP BOLTS
Nominal or
Basic
Product
Diameter
F
G
H
Width Across Flats
Width Across Corners
Head Height
Basic
Max.
Min.
Max.
Min.
Basic
Max.
Min.
1/4
7/16
0.438
0.428
0.505
0.488
5/32
0.163
0.150
5/16
1/2
0.500
0.489
0.577
0.557
13/64
0.211
0.195
3/8
9/16
0.562
0.551
0.650
0.628
15/64
0.243
0.226
7/16
5/8
0.625
0.612
0.722
0.698
9/32
0.291
0.272
1/2
3/4
0.750
0.736
0.866
0.840
5/16
0.323
0.302
5/8
15/16
0.938
0.922
1.083
1.051
25/64
0.403
0.378
3/4
1-1/8
1.125
1.100
1.299
1.254
15/32
0.483
0.455
Nominal Size
Nominal Screw Size
Tolerance on Length
86
Up to 1 in., incl.
Over 1 in. to
2-1/2 in., incl.
Over 2-1/2 in. to
4 in., incl.
Over 4 in. to
6 in., incl.
1/4 to 3/8
-0.03
-0.04
-0.06
-0.10
7/16 and 1/2
-0.03
-0.06
-0.08
-0.10
9/16 to 3/4
-0.03
-0.08
-0.10
-0.10
Grade-2
Headmark
Grade-5
Headmark
Grade-8
Headmark
**
**
**
x
Bolts & Cap Screws
Hex Tap Bolts
Grades 2, 5 & 8
x
x
Description
Grade-2 Tap Bolt: A low carbon, hex head bolt with a machined point which is threaded to the head.
Grade-5 Tap Bolt: A tap bolt made from medium carbon steel.
Grade-8 Tap Bolt: A tap bolt made from medium carbon alloy steel and heat-treated.
Applications/
Advantages
Grade-2 Tap Bolt: To be used in drilled and tapped holes which are threaded full length. Used instead of a stud and a nut.
Grade-5 Tap Bolt: Used to mount motors to machinery; also popular in automotive and truck repair.
Grade-8 Tap Bolt: Used in automotive and fleet industries where greater tensile strength is required than can be met by a grade-5.
Material
Grade-2 Tap Bolt: AISI 1006 - 1025 or equivalent steel.
Grade-5 Tap Bolt: AISI 1030 - 1541 or equivalent medium carbon steel. Use of an alloy such as 4037 modified steel is also
acceptable.
Grade-8 Tap Bolt: Medium carbon alloy steel. Note: For diameters 1/4 through 7/16 inch, it is permissible to use AISI 1541 steel.
Heat Treatment
Grade-5 Tap Bolt: Bolts shall be heat treated, oil or water quenched, at the option of the manufacturer, and tempered at a minimum
tempering temperature of 800°F.
Grade-8 Tap Bolt: Bolts shall be heat treated, oil quenched and tempered at a minimum tempering temperature of 800°F.
Core Hardness
Grade-2 Tap Bolt: Rockwell B80 - B100
Grade-5 Tap Bolt: Rockwell C25 - C34
Grade-8 Tap Bolt: Rockwell C33 - C39
Surface Hardness
Grade-5 Tap Bolt: Rockwell 30N54 maximum
Grade-8 Tap Bolt: Rockwell 30N58.6 maximum
Proof Load
Grade-2 Tap Bolt: 55,000 psi.
Grade-5 Tap Bolt: 85,000 psi.
Grade-8 Tap Bolt: 120,000 psi.
Yield Strength*
Grade-2 Tap Bolt: 57,000 psi. minimum
Grade-5 Tap Bolt: 92,000 psi. minimum
Grade-8 Tap Bolt: 130,000 psi. minimum
Tensile Strength
Grade-2 Tap Bolt: 74,000 psi. minimum
Grade-5 Tap Bolt: 120,000 psi. minimum
Grade-8 Tap Bolt: 150,000 psi. minimum
Elongation*
Grade-2 Tap Bolt: 18% minimum
Grade-5 Tap Bolt: 14% minimum
Grade-8 Tap Bolt: 12% minimum
Reduction of Area*
Grades-2, 5 & 8 Tap Bolts: 35% minimum (all sizes)
Plating
See Appendix-A for plating information.
*These properties are tested only on machined specimens when the testing machine cannot provide for full testing of the parts.
**Product standards require the manufacturer’s head marking to appear on the top of all bolts 1/4” diameter and larger. “X” represents one location such a marking may appear.
87
Carriage Bolts,
Square Neck
Cap Screws & Bolts
Low Carbon &
Hot-Dip Galvanized
H
P
O
E
‡
L
A
CARRIAGE BOLTS - SQUARE NECK
Basic Bolt Diameter
•8
10
1/4
5/16
3/8
7/16
1/2
5/8
3/4
0.1640
0.1900
0.2500
0.3125
0.3750
0.4375
0.5000
0.6250
0.7500
E
Body Diameter
Max
Min
0.173
0.157
0.199
0.182
0.260
0.237
0.324
0.298
0.388
0.360
0.452
0.421
0.515
0.483
0.642
0.605
0.768
0.729
A
Head Diameter
Max
Min
0.328
0.298
0.469
0.436
0.594
0.563
0.719
0.688
0.844
0.782
0.969
0.907
1.094
1.032
1.344
1.219
1.594
1.469
ASME B18.5-1990
H
Head Height
Max
Min
0.102
0.083
0.114
0.094
0.145
0.125
0.176
0.156
0.208
0.188
0.239
0.219
0.270
0.250
0.344
0.313
0.406
0.375
O
Square Width
Max
Min
0.169
0.155
0.199
0.185
0.260
0.245
0.324
0.307
0.388
0.368
0.452
0.431
0.515
0.492
0.642
0.616
0.768
0.741
P
Square Depth
Max
Min
0.108
0.078
0.125
0.094
0.156
0.125
0.187
0.156
0.219
0.188
0.250
0.219
0.281
0.250
0.344
0.313
0.406
0.375
Nominal Bolt Length
Nominal Bolt Size
Tolerance on Length
No. 8 thru 3/8
7/16 and 1/2
9/16 thru 3/4
Up to 1 in.,
incl.
Over 1 in. to
2-1/2 in., incl.
Over 2-1/2 in.
to 4 in., incl.
Over 4 in. to
6 in., incl.
Over 6 in.
+0.02
-0.03
+0.02
-0.03
+0.02
-0.03
+0.02
-0.04
+0.04
-0.05
+0.06
-0.08
+0.04
-0.06
+0.06
-0.08
+0.08
-0.10
+0.06
-0.10
+0.08
-0.10
+0.10
-0.10
+0.10
-0.18
+0.12
-0.18
+0.14
-0.18
‡Length of a carriage bolt is measured from the underhead bearing surface to the extreme end of the bolt.
• ASME B18.5-1990 does not specify dimensions for the #8 diameter. Data listed for this size is independent of the ASME specification.
LOW CARBON & HOT-DIP GALVANIZED CARRIAGE BOLT
**
x
Description
Low Carbon Steel Carriage: Round head bolt with a square neck under the head, and a unified thread pitch. Made from low or
medium carbon steel.
Hot-Dip Galvanized Steel Carriage: Carriage bolt made from low or medium carbon steel with a galvanic zinc finish applied.
Applications/
Advantages
Low Carbon Steel Carriage: The square neck is designed to keep the bolt from turning as a nut is tightened.
Hot-Dip Galvanized Steel Carriage: Same design advantages as a low carbon carriage bolt but with a thicker protective coating for
outdoor use. Often used in outdoor furniture.
Material
Low Carbon Steel & Hot-Dip Galvanized Steel Carriage: AISI 1006 - 1050 or equivalent steel.
Core Hardness
Low Carbon Steel & Hot-Dip Galvanized Steel Carriage: Rockwell B70 - B100
Proof Load
Low Carbon Steel Carriage: 33,000 psi.
Yield Strength*
Low Carbon Steel Carriage: 36,000 psi. minimum
Tensile Strength
Elongation*
Low Carbon Steel Carriage: 60,000 psi. minimum
Reduction of Area*
Low Carbon Steel Carriage: 35% minimum (all sizes)
Minimum Thread
Length
Plating
The minimum length of thread shall be equal to twice the basic bolt diameter plus 0.25 in. for bolts 6 in. or shorter, and twice the
diameter plus 0.50 in. for bolts longer than 6 in..
Low Carbon Steel Carriage: 18% minimum
See Appendix-A for information on the plating of steel carriage bolts.
*These properties are tested only on machined specimens when the testing machine cannot provide for full testing of the parts.
**Product standards require the manufacturer’s head marking to appear on the top of all bolts 1/4” diameter and larger. “X” represents one location such a marking may appear.
88
Grade-5 &
18-8 Stainless
Carriage Bolts,
Square Neck
Bolts & Cap Screws
NOTE: Dimensions for Grade-5 & 18-8 Stainless Steel Carriage Bolts are listed on page 88.
**
GRADE-5 CARRIAGE BOLT
x
Description
Carriage bolt made from medium carbon steel.
Applications/
Advantages
Same design advantages as a low carbon carriage bolt but with significantly greater load carrying capacity.
Material
AISI 1030 - 1050 or equivalent steel.
Heat Treatment
Bolts shall be heat-treated, oil or water-quenched, at the option of the manufacturer, and tempered at a minimum temperature of
800°F.
Core Hardness
1/4 through 1 in. diameters: Rockwell C25 - C34
Surface Hardness
1/4 through 1 in. diameters: Rockwell 30N54 maximum
Proof Load
1/4 through 1 in. diameters: 85,000 psi.
Yield Strength*
1/4 through 1 in. diameters: 92,000 psi. minimum
Tensile Strength
1/4 through 1 in. diameters: 120,000 psi. minimum
Elongation*
14% minimum
Reduction of Area*
35% minimum (all sizes)
Minimum Thread
Length
The minimum length of thread shall be equal to twice the basic bolt diameter plus 0.25 in. for bolts 6 in. or shorter, and twice the
diameter plus 0.50 in. for bolts longer than 6 in..
Plating
See Appendix-A for information on the plating of steel carriage bolts.
x
5 9 -C
3
F
CARRIAGE BOLT -- STAINLESS STEEL, 18-8
**
Description
Round head bolt with a square neck under the head, and a unified thread pitch, made from austenitic alloy stainless steel.
Applications/
Advantages
Same design advantages as a low carbon carriage bolt but for use in environments which require general atmospheric corrosion
resistance.
Material
18-8 stainless steel carriage bolts are made from one of the following austenitic alloys: 302 HQ, 303, 303Se, 304, XM7, all of which
are characterized as having a chromium content of 17-19% and nickel content of 8-10%.
Heat Treatment
The austenitic alloys develop their strength through work hardening during the fastener manufacturing process, as seen from the
hardness properties below. The only heat treatment normally available on austenitic stainless alloys is annealing, which is done at
approximately 1900°F to a dead soft condition and is not normally thermally reversible.
Hardness
1/4 through 1/2 in. diameter: Rockwell B95 - C32.
Yield Strength
1/4 through 1/2 in. diameter, 2.25D and longer: 65,000 psi. minimum
Tensile Strength
1/4 through 1/2 in. diameter, 2.25D and longer: 100,000 - 150,000 psi. minimum
Elongation in 4D
1/4 through 1/2 in. diameter: 20% minimum
Minimum Thread
Length
The minimum length of thread shall be equal to twice the basic bolt diameter plus 0.25 in. for bolts 6 in. or shorter.
*These properties are tested only on machined specimens when the testing machine cannot provide for full testing of the parts.
**Product standards require the manufacturer’s head marking to appear on the top of all bolts 1/4” diameter and larger. “X” represents one location such a marking may appear.
89
Cap Screws & Bolts
Carriage Bolts
Short Neck
H
N
S
R
B
o
15 Max
‡
L
W
C
CARRIAGE BOLTS, S HORT NECK
B
Nominal Size or
Basic Bolt
Diameter
1/4
W
Body Diameter
0.2500
H
Head Diameter
ANSI/ASME B18.5
S
Head Height
Square Width
N
C
R
Square Depth
Corner
Radius
on
Square
Fillet
Radius
Max
Min
Max
MIn
Max
Min
Max
Min
Max
Min
Max
Max
0.260
0.213
0.594
0.563
0.145
0.125
0.260
0.245
0.124
0.093
0.031
0.031
5/16
0.3125
0.324
0.272
0.719
0.688
0.176
0.156
0.324
0.307
0.124
0.093
0.031
0.031
3/8
0.3750
0.388
0.329
0.844
0.782
0.208
0.188
0.388
0.368
0.156
0.125
0.047
0.031
7/16
0.4375
0.452
0.385
0.969
0.907
0.239
0.219
0.452
0.431
0.156
0.125
0.047
0.031
1/2
0.5000
0.515
0.444
1.094
1.032
0.270
0.250
0.515
0.492
0.156
0.125
0.047
0.031
5/8
0.6250
0.642
0.559
1.344
1.219
0.344
0.313
0.642
0.616
0.218
0.187
0.078
0.062
3/4
0.7500
0.768
0.678
1.594
1.469
0.406
0.375
0.768
0.741
0.218
0.187
0.078
0.062
Nominal Screw Length
Nominal Bolt Size
Up to 1 in., incl.
Tolerance on
Length
No. 10 thru 3/8
+0.02
-0.03
Over 1 in. to
2 1/2 in., incl.
+0.02
Over 2 1/2 in. to 4
in., incl.
-0.04
7/16 and 1/2
+0.02
-0.03
+0.04
-0.05
9/16 thru 3/4
+0.02
-0.03
+0.06
-0.08
+0.04
Over 4 in. to
6 in., incl.
Over 6 in.
-0.06
+0.06
-0.10
+0.10
-0.18
+0.06
-0.08
+0.08
-0.10
+0.12
-0.18
+0.08
-0.10
+0.10
-0.10
+0.14
-0.18
7/8 and 1
....
....
+0.08
-0.10
+0.10
-0.14
+0.12
-0.16
+0.16
-0.20
1-1/8 thru 1-1/2
....
....
+0.12
-0.12
+0.16
-0.16
+0.18
-0.18
+0.22
-0.22
‡Length of a carriage bolt is measured from the underhead bearing surface to the extreme end of the bolt.
Description
A round head bolt with a short, square shoulder under the head, and a unified thread pitch. The bolt is made from low or medium
carbon steel.
Applications/
Advantages
Carriage bolts are designed to keep the bolt from turning when a nut is being tightened. The short neck variety is used in sheet
metal where a standard sized neck would create an obstruction.
Material
AISI 1006 - 1050 or equivalent steel
Hardness
Rockwell B70 - 100
Proof Load
33,000 psi.
Tensile Strength
60,000 psi. minimum
Yield Strength
36,000 psi. minimum
Elongation
18% minimum
Reduction of Area
35% minimum
Minimum Thread
Length
The minimum length of thread shall be equal to twice the basic bolt diameter plus 0.25 in. for bolts 6 in. or shorter, and twice the
diameter plus 0.50 in. for bolts longer than 6 in..
Plating
See Appendix-A for plating information.
90
Bolts & Cap Screws
Carriage Bolts
Ribbed Neck
o
H
90
Approx
D
M
V
B
R
L
‡
W
ASME B18.51990
CARRIAGE B OLTS, RIBBED NECK
B
W
H
V
M
D
Depth Over Ribs
Head to Ribs
Nominal Size
or Basic Bolt
Diameter
Number
of Ribs
For Lengths of
Body Diameter Head Diameter
No. 10 0.1900
Head Height
1 in.
7/8 and
and
Shorter
Longer
+ 0.031*
Max
Min
Max
Min
Max
Min
0.199
0.182
0.469
0.438
0.114
0.094
0.031
R
Diameter
Over
Ribs
For Lengths of
7/8 and
Shorter
1 in.
and
1-1/8
Fillet
1-1/4 Radius
and
Longer
Approx
Min
9
0.210
0.250
0.407
0.594
0.063
+0.031
Max
0.031
1/4
0.2500
0.260
0.237
0.594
0.563
0.145
0.125
0.031
0.063
10
0.274
0.250
0.407
0.594
0.031
5/16
0.3125
0.324
0.298
0.719
0.688
0.176
0.156
0.031
0.063
12
0.340
0.250
0.407
0.594
0.031
3/8
0.3750
0.388
0.360
0.844
0.782
0.208
0.188
0.031
0.063
12
0.405
0.250
0.407
0.594
0.031
7/16
0.4375
0.452
0.421
0.969
0.907
0.239
0.219
0.031
0.063
14
0.470
0.250
0.407
0.594
0.031
1/2
0.5000
0.515
0.483
1.094
1.032
0.270
0.250
0.031
0.063
16
0.534
0.250
0.407
0.594
0.031
5/8
0.6250
0.642
0.605
1.344
1.219
0.344
0.313
0.094
0.094
19
0.660
0.313
0.438
0.625
0.062
3/4
0.7500
0.768
0.729
1.594
1.469
0.406
0.375
0.094
0.094
22
0.785
0.313
0.438
0.625
0.062
Nominal Screw Length
Nominal Screw Size
Tolerance on Length
Up to 1 in.,
incl.
Over 1 in. to
2 1/2 in., incl.
Over 2 1/2 in. to 4
in., incl.
Over 4 in. to
6 in., incl.
Over 6 in.
No. 10 thru 3/8
+0.02
-0.03
+0.02
-0.04
+0.04
-0.06
+0.06
-0.10
+0.10
-0.18
7/16 and 1/2
+0.02
-0.03
+0.04
-0.05
+0.06
-0.08
+0.08
-0.10
+0.12
-0.18
9/16 thru 3/4
+0.02
-0.03
+0.06
-0.08
+0.08
-0.10
+0.10
-0.10
+0.14
-0.18
7/8 and 1
....
....
+0.08
-0.10
+0.10
-0.14
+0.12
-0.16
+0.16
-0.20
1-1/8 thru 1-1/2
....
....
+0.12
-0.12
+0.16
-0.16
+0.18
-0.18
+0.22
-0.22
‡Length of a carriage bolt is measured from the underhead bearing surface to the extreme end of the bolt.
*Tolerance on #10 through 1/2” sizes for nominal lengths of 7/8” and shorter shall be +0.031 and -0.000.
Description
A round head bolt with a ribbed or serrated shoulder made from low carbon steel.
Applications/
Advantages
For use in soft, ductile metals, wood and plastics to keep the bolt from turning when nut is being tightened.
Material
Bolts shall be made from a carbon steel which conforms to the following chemical composition requirements-Carbon: 0.55% maximum; Phosphorus: 0.048% maximum; Sulfur: 0.058% maximum
Hardness
Rockwell B70 - 100
Tensile Strength
60,000 psi. minimum
Yield Strength
36,000 psi. minimum
Elongation
18% minimum
Reduction of Area
35% minimum
Plating
See Appendix-A for plating information.
91
Cap Screws & Bolts
Carriage Bolts
H
Fin Neck
T
F
A
D
R
W
L
ASME B18.51990
CARRIAGE B OLTS, FIN N ECK
D
Nominal Size
or Basic Bolt
Diameter
W
Body Diameter Head Diameter
H
T
A
F
R
Head Height
Fin Thickness
Distance
Across Fins
Fin Depth
Fillet Radius
Max
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
Min
Max
Min
10
0.1900
0.199
0.182
0.469
0.438
0.114
0.094
0.098
0.078
0.395
0.375
0.088
0.076
0.031
0.015
1/4
0.2500
0.260
0.237
0.594
0.563
0.145
0.125
0.114
0.094
0.458
0.438
0.104
0.094
0.031
0.015
5/16
0.3125
0.324
0.298
0.719
0.688
0.176
0.156
0.145
0.125
0.551
0.531
0.135
0.125
0.031
0.015
3/8
0.3750
0.388
0.360
0.844
0.782
0.208
0.188
0.161
0.141
0.645
0.625
0.151
0.141
0.031
0.015
7/16
0.4375
0.452
0.421
0.969
0.907
0.239
0.219
0.192
0.172
0.739
0.719
0.182
0.172
0.031
0.015
1/2
0.5000
0.515
0.483
1.094
1.032
0.270
0.250
0.208
0.188
0.833
0.813
0.198
0.188
0.031
0.015
Nominal Screw Length
Nominal Bolt Size
Up to 1 in., incl.
Over 1 in. to
2 1/2 in., incl.
#10 thru 3/8
+0.02
-0.03
+0.02
-0.04
+0.04
-0.06
+0.06
-0.10
+0.10
-0.18
7/16 and 1/2
+0.02
-0.03
+0.04
-0.05
+0.06
-0.08
+0.08
-0.10
+0.12
-0.18
Tolerance on Length
Over 2 1/2 in. to
4 in., incl.
Over 4 in. to
6 in., incl.
Over 6 in.
Description
A round head bolt with a flat bearing surface which intersects with the shank at a 90° angle. Where the bearing surface and shank
meet are two fins, 180° opposite each othe. The bolt is made from low carbon steel.
Applications/
Advantages
Primarily used in thin plywood to keep the bolt from turning when nut is being tightened.
Material
Bolts shall be made from a carbon steel which conforms to the following chemical composition requirements-Carbon: 0.55% maximum; Phosphorus: 0.060% maximum; Sulfur: 0.150% maximum
Hardness
Rockwell B69 - 100
Tensile Strength
60,000 psi. minimum
Yield Strength
36,000 psi. minimum
Elongation
18% minimum
Reduction of Area
35% minimum
Plating
See Appendix-A for plating information.
92
Bolts & Cap Screws
Step Bolts
H
O
P
E
‡
L
A
‡Length of a step bolt is measured from the underhead bearing surface to the extreme end of the bolt.
STEP BOLTS
Nominal
Size
ANSI/ASME B18.5
E
A
H
O
P
Body Diameter
Head Diameter
Head Height
Square Width
Square Depth
Max.
Min.
Max.
Min,
Max.
Min.
Max.
Min.
Max.
Min.
10
0.199
0.182
0.656
0.625
0.114
0.094
0.199
0.185
0.125
0.094
1/4
0.260
0.237
0.844
0.813
0.145
0.125
0.260
0.245
0.156
0.125
5/16
0.324
0.298
1.031
1.000
0.176
0.156
0.324
0.307
0.187
0.156
3/8
0.388
0.360
1.219
1.188
0.208
0.188
0.388
0.368
0.219
0.188
Nominal Bolt Length
Nominal Bolt Size
Tolerance on Length
No. 10 thru 3/8
Up to 1 in., incl.
Over 1 in. to 2-1/2 in.,
incl.
Over 2-1/2 in. to 4 in.,
incl.
+0.02, -0.03
+0.02, -0.04
+0.04, -0.06
Description
Similar to a carriage bolt in bearing surface and square-neck design, but with a wider, lower-profile, round head.
Applications/
Advantages
Preferred for use where wood is bolted down as decking--the larger diameter head of the step bolt will not pull through the soft
wood. Smooth, low, rounded head permits unrestricted movement over the surface.
Material
AISI 1006 - 1050 or equivalent steel.
Hardness
No. 10 through 3/8 in. diameter, all lengths: Rockwell B70 - B100
Proof Load
No. 10 through 3/8 in. diameter, all lengths: 33,000 psi.
Yield Strength
No. 10 through 3/8 in. diameter, all lengths: 36,000 psi. minimum
Tensile Strength
No. 10 through 3/8 in. diameter, all lengths: 54,000 psi. minimum
Elongation
18% minimum (all sizes)
Reduction of Area
35% minimum (all sizes)
Minimum Thread
Length
The minimum length of thread shall be equal to twice the basic bolt diameter plus 0.25 in..
Plating
See Appendix-A for plating information.
93
Serrated Hex Washer
Flange Screws
Cap Screws & Bolts
W
F
L‡
H
‡Length of a serrated flange screw is measured from the bottom of the serrations to the extreme end of the screw.
SERRATED H EX WASHER HEAD FLANGE SCREWS
Size (Diameter &
Thread Pitch)
W
H
F
Width Across Flats
Thickness
Flange Diameter
Max
Min
Max
Min
Max
Min
4-40
.188
.181
.079
.060
.243
.225
6-32
.187
.181
.157
.132
.266
.254
8-32
.250
.244
.186
.161
.355
.341
10-24 & 10-32
.312
.305
.210
.185
.441
.425
12-24
.312
.305
.240
.161
.520
.398
1/4-20 & 1/4-28
.375
.367
.240
.216
.531
.513
5/16-18 & 5/16-24
.500
.491
.298
.274
.706
.686
3/8-16 & 3/8-24
.562
.552
.331
.307
.793
.771
7/16-14
.625
.612
.460
.365
.930
.856
1/2-13 & 1/2-20
.750
.736
.510
.470
1.070
1.020
5/8-11
.9375
.922
.620
.580
1.330
1.260
3/4-10
1.1250
1.100
.730
.680
1.590
1.490
Tolerance on
Length
(ASME B18.2.1 &
ASME B18.6.3)
94
Nominal Screw Length
Nominal Screw
Size
Up to 1/2 in., incl.
Over 1/2 in. to
1 in., incl.
Over 1 in. to
2 in., incl.
Over 2 in. to
4 in., incl.
Over 4 in. to
6 in., incl.
No. 4 thru 12
-0.02
-0.03
-0.06
-0.09
-0.09
1/4 thru 3/8
-0.03
-0.03
-0.06
-0.09
-0.10
7/16 thru 1/2
-0.03
-0.03
-0.06
-0.09
-0.10
9/16 thru 3/4
....
-0.03
-0.08
-0.10
-0.10
Description
An unslotted hex-washer machine screw, but with a thicker flange and serrations on the bearing surface side.
Applications/
Advantages
Designed for use in applications where loosening forces are present, such as vibration. The serrations grip to the bearing surface
so that significantly more torque is needed to loosen than to tighten the screw. Flange provides more strength than a standard
machine screw. Eliminates need for a lockwasher or locknut.
Material
AISI C1022 steel.
Heat Treatment
Serrated flange screws shall be heat treated, quenched and tempered at a minimum temperature of 650°F.
Surface Hardness
No. 6 through 3/4 in. diameter, all lengths: Rockwell 30N57.5 maximum
Core Hardness
No. 6 through 3/4 in. diameter, all lengths: Rockwell C25 - C38
Proof Load
No. 6 through 3/4 in. diameter, all lengths: 85,000 psi.
Tensile Strength
No. 6 through 3/4 in. diameter, all lengths: 120,000 psi. minimum
Plating
See Appendix-A for plating information.
Hex Washer Frame Bolts Bolts & Cap Screws
Grade 8
L‡
D
F
U
H
LT
**
E
x
B G
15˚-30˚
‡Length of a frame bolt is measured from the underhead bearing surface to the extreme end of the screw.
IFI 111 &
SAE J429
FRAME BOLTS • GRADE 8 A LLOY
Nominal
Size
E
F
G
B
Body Diameter
Width Across Flats
Width Across
Corners
U
D
Flange
Flange
Head
ThickDiam.
Height
ness
H
LT
Lbs.
Proof
Load,
Lbs.
4,750
3,800
Tensile
Hex
Thread
Strength,
Height Length
Max
Min
Basic
Max
Min
Max
Min
Max
Min
Max
Min
Basic
1/4
0.2500
0.2450
3/8
0.3750
0.367
0.433
0.409
0.56
0.04
0.28
0.17
0.750
5/16
0.3125
0.3065
1/2
0.5000
0.489
0.577
0.548
0.68
0.05
0.32
0.21
0.875
7,850
6,300
3/8
0.3750
0.3690
9/16
0.5625
0.551
0.650
0.618
0.81
0.06
0.425
0.25
1.000
11,600
9,300
7/16
0.4375
0.4305
5/8
0.6250
0.612
0.722
0.685
0.93
0.07
0.46
0.30
1.125
15,900
12,800
1/2
0.5000
0.4930
3/4
0.7500
0.736
0.866
0.825
1.07
0.08
0.555
0.34
1.250
21,300
17,000
5/8
0.6250
0.6170
15/16
0.9375
0.922
1.083
1.034
1.33
0.10
0.690
0.42
1.500
33,900
27,100
3/4
0.7500
0.7410
1-1/8
1.1250
1.100
1.299
1.234
1.59
0.11
0.825
0.51
1.750
50,100
40,100
Nominal Bolt Length
Nominal Bolt Size
Tolerance on Length
Up to 1 in., incl.
Over 1 in. to 2-1/2 in., incl.
Over 2-1/2 in. to
4 in., incl.
1/4 to 3/8
-0.03
-0.04
-0.06
7/16 and 1/2
-0.03
-0.06
-0.08
5/8 and 3/4
-0.03
-0.08
-0.10
Description
A one-piece hex-washer head bolt with a flat bearing surface, made of high-alloy steel.
Applications/
Advantages
For use on truck frames. The flange eliminates washers and helps compensate for a misaligned hole. Used with a Grade-Gt lock
nut, the bolt system resists bolt slippage by distributing the clamp load over a wide area.
Material
AISI 4037 - 5135 or equivalent alloy steel
Heat Treatment
Grade-8 frame bolts shall be heat-treated, oil-quenched and tempered at a minimum temperature of 800°F.
Core Hardness
Rockwell C33 - C39
Surface Hardness
Rockwell 30N58.6 maximum
Proof Load
120,000 psi.
Yield Strength
130,000 psi. minimum
Tensile Strength
150,000 psi. minimum
Coating
See Appendix-A for information on the plating of frame bolts.
**Product standards require the manufacturer’s head marking to appear on the top of all bolts 1/4” diameter and larger. “X” represents one location such a marking may appear.
95
Cap Screws & Bolts
Alloy
Steel
12-Point Flange Screws
H
R
F
T
A
**
W
x
C
B
LB
LG
o
30
Y
‡
L
LT
D
‡Length of a flange screw is measured from the underhead bearing surface to the extreme end of the screw.
12-POINT F LANGE SCREWS
B
D
F
C
H
W
Nominal
Size
Body
Diam.
Flange Diam.
Width Across
Flats
Min
Max
Min
Max
Min
Min
Max
Min
1/4
0.2435
0.375
0.365
0.252
0.244
0.278
0.260
0.15
5/16
0.3053
0.469
0.457
0.315
0.306
0.348
0.312
0.18
3/8
0.3678
0.562
0.550
0.377
0.368
0.420
0.375
0.21
7/16
0.4294
0.656
0.642
0.438
0.429
0.489
0.438
0.26
IFI 115
T
A
R
LT
Y
Gaging Ring
Thickness
Gaging Ring
Diam.
Thread
Length
Transition
Thread
Length
Min
Max
Max
0.058
0.0525
0.0522 0.2783 0.2780
0.074
0.0600
0.0597 0.3483 0.3480
1.125
0.28
0.095
0.0711
0.0708 0.4203 0.4200
1.250
0.31
0.109
0.0840
0.0837 0.4893 0.4890
1.375
0.36
Flange
Width
Head WrenchThicking
Across
Height Height
ness
Corners
Min
Min
Basic
Max
1.000
0.25
1/2
0.4919
0.750
0.735
0.502
0.493
0.562
0.500
0.29
0.129
0.0948
0.0945 0.5623 0.5620
1.500
0.38
9/16
0.5538
0.844
0.828
0.564
0.555
0.633
0.563
0.33
0.145
0.1071
0.1068 0.6333 0.6330
1.625
0.42
5/8
0.6163
0.938
0.921
0.627
0.618
0.705
0.625
0.36
0.166
0.1179
0.1176 0.7053 0.7050
1.750
0.46
3/4
0.7406
1.125
1.107
0.752
0.743
0.847
0.750
0.44
0.200
0.1416
0.1413 0.8473 0.8470
2.000
0.50
0.56
7/8
0.8647
1.312
1.293
0.877
0.866
0.987
0.875
0.51
0.234
0.1656
0.1653 0.9873 0.9870
2.250
1
0.9886
1.500
1.479
1.003
0.991
1.130
1.000
0.60
0.268
0.1893
0.1890 1.1303 1.1300
2.500
0.62
1-1/8
1.1086
1.688
1.665
1.128
1.115
1.271
1.125
0.66
0.310
0.2109
0.2106 1.2713 1.2710
2.750
0.71
1-1/4
1.2336
1.875
1.852
1.253
1.240
1.414
1.250
0.73
0.350
0.2331
0.2328 1.4143 1.4140
3.000
0.71
1-3/8
1.3568
2.062
2.038
1.378
1.365
1.556
1.375
0.80
0.392
0.2544
0.2541 1.5563 1.5560
3.250
0.83
1-1/2
1.4818
2.250
2.224
1.503
1.489
1.697
1.500
0.87
0.433
0.2763
0.2760 1.6973 1.6970
3.500
0.83
Nominal Screw Lengths
Tolerance on Length
Up to 1 in., incl.
Over 1 to 2 in., incl.
over 2 to 6 in., incl.
over 6 in.
-0.031
-0.047
-0.062
-0.125
Description
A one-piece bolt with a 24-sided head and a flanged bearing surface, made of alloy steel.
Applications/
Advantages
Popular in aircraft manufacturing and aftermarket because of its ease of installation with pneumatic wrenches.
Material
Alloy Steel
Heat Treatment
Grade-8 flange screws shall be heat treated, oil quenched and tempered at a minimum tempering temperature of 800°F.
Hardness
Rockwell C37 - 43
Tensile Strength
170,000 psi. minimum
Yield Strength
158,000 psi. minimum
Proof Load
135,000 psi.
Plating
See Appendix-A for plating information.
**Product standards require the manufacturer’s head marking to appear on the top of all bolts 1/4” diameter and larger. “X” represents one location such a marking may appear.
96
Bolts & Cap Screws
T-Head Bolts
W
D
B
R
N
‡
L
H
‡Length of a T-head bolt is measured from the underhead bearing surface to the extreme end of the bolt.
T-HEAD BOLTS
Nominal Size or
Basic Bolt Diameter
ANSI/ASME B18.5
B
N
W
H
D
R
Body Diameter
Head Length
Head Width
Head Height
Head
Radius
Fillet
Radius
Basic
Max
Max
Min
Max
Min
Max
MIn
Max
MIn
1/4
0.2500
0.260
0.237
0.500
0.488
0.280
0.245
0.204
0.172
0.438
0.031
5/16
0.3125
0.324
0.298
0.625
0.609
0.342
0.307
0.267
0.233
0.500
0.031
3/8
0.3750
0.388
0.360
0.750
0.731
0.405
0.368
0.331
0.295
0.625
0.031
7/16
0.4375
0.452
0.421
0.875
0.853
0.468
0.431
0.394
0.356
0.875
0.031
1/2
0.5000
0.515
0.483
1.000
0.975
0.530
0.492
0.458
0.418
0.875
0.031
5/8
0.6250
0.642
0.605
1.250
1.218
0.675
0.616
0.585
0.541
1.062
0.062
3/4
0.7500
0.768
0.729
1.500
1.462
0.800
0.741
0.649
0.601
1.250
0.062
7/8
0.8750
0.895
0.852
1.750
1.706
0.938
0.865
0.776
0.724
1.375
0.062
1
1.0000
1.022
0.976
2.000
1.950
1.063
0.990
0.903
0.847
1.500
0.062
Nominal
Bolt Size
Tolerance
on
Length
Nominal Screw Length
Up to 1 in., incl.
Over 1 in. to
2 1/2 in., incl.
Over 2 1/2 in. to 4 in.,
incl.
Over 4 in. to
6 in., incl.
Over 6 in.
No. 10
thru 3/8
+0.02
-0.03
+0.02
-0.04
+0.04
-0.06
+0.06
-0.10
+0.10
-0.18
7/16 and
1/2
+0.02
-0.03
+0.04
-0.05
+0.06
-0.08
+0.08
-0.10
+0.12
-0.18
9/16 thru
3/4
+0.02
-0.03
+0.06
-0.08
+0.08
-0.10
+0.10
-0.10
+0.14
-0.18
7/8 and
1
....
....
+0.08
-0.10
+0.10
-0.14
+0.12
-0.16
+0.16
-0.20
1-1/8 thru
1-1/2
....
....
+0.12
-0.12
+0.16
-0.16
+0.18
-0.18
+0.22
-0.22
Description
A low or medium carbon steel, externally threaded mechanical device 1/4" diameter or larger, with a rectangular head with a rounded
top surface and a flat bearing surface.
Applications/
Advantages
Used in the machine tool and water works industries
Material
Bolts shall be made from a carbon steel which conforms to the following chemical composition requirements-Carbon: 0.55% maximum; Phosphorus: 0.048% maximum; Sulfur : 0.058% maximum
Hardness
Rockwell B70 - 100
Tensile Strength
60,000 psi. minimum
Yield Strength
36,000 psi. minimum
Elongation
18% minimum
Reduction of Area
35% minimum
Plating
See Appendix-A for plating information.
97
Plow Bolts
Cap Screws & Bolts
No. 3 Head
S (max)
45°
(if F nears 0)
S (min)
(if F > 0 and with
A= ABS min A
with flat)
S (min)
A
max
A
min
sharp
Thread length
A
A
ABS min
with flat
80˚ F
82˚
F
D
S
B
L‡
‡Length of a plow bolt is measured from the top of the head to the extreme end of the bolt.
ASME
B18.9-1996
NO. 3 HEAD PLOW BOLTS
D
Nominal
Diameter
E
A
F
S
B
Diameter of Full Size
Body
Diameter of Head
Feed
Thickness
Depth of Square and
Head
Width of Square
Max
Min
Max
Min Sharp
Abs. Min
with Flat
Max
Max
Min
Max
Min (Basic)
5/16
0.312
0.299
0.605
0.578
0.563
0.025
0.269
0.243
0.325
0.313
3/8
0.375
0.360
0.708
0.671
0.656
0.031
0.312
0.281
0.387
0.375
7/16
0.438
0.421
0.826
0.781
0.766
0.036
0.364
0.328
0.450
0.438
1/2
0.500
0.483
0.945
0.890
0.875
0.042
0.417
0.375
0.515
0.500
5/8
0.657
0.606
1.147
1.094
1.063
0.050
0.506
0.456
0.640
0.625
3/4
0.782
0.729
1.303
1.250
1.219
0.050
0.541
0.491
0.765
0.750
7/8
0.938
0.853
1.512
1.469
1.406
0.063
0.626
0.563
0.906
0.875
1
1.062
0.976
1.700
1.656
1.594
0.063
0.690
0.627
1.031
1.000
Nominal Bolt Size
All Lengths
1/4 through 3/8
±0.03
7/16 and 1/2
±0.06
5/8 through 1
±0.12
Tolerance on Length
MINIMUM THREAD LENGTH
Recommended
Bolt Length
98
OF
ASME B18.91996
PLOW BOLTS (2D + 0.25)
Nominal Bolt Diameter, D
5/16
3/8
7/16
1/2
5/8
3/4
7/8
1
1
T to H
T to H
-
-
-
-
-
-
1-1/4
0.875
T to H
T to H
T to H
T to H
-
-
-
1-1/2
0.875
1.000
T to H
T to H
T to H
T to H
T to H
-
1-3/4
0.875
1.000
1.125
1.250
T to H
T to H
T to H
T to H
2
0.875
1.000
1.125
1.250
T to H
T to H
T to H
T to H
2-1/4
0.875
1.000
1.125
1.250
1.500
T to H
T to H
T to H
2-1/2
0.875
1.000
1.125
1.250
1.500
1.750
T to H
T to H
3
0.875
1.000
1.125
1.250
1.500
1.750
2.000
2.250
3-1/2
0.875
1.000
1.125
1.250
1.500
1.750
2.000
2.250
4
0.875
1.000
1.125
1.250
1.500
1.750
2.000
2.250
Grades 5 & 8
Bolts & Cap Screws
Plow Bolts
**
GRADE-5 PLOW BOLT
x
Description
Bolt with a countersunk, flat head, square neck and unified thread pitch, made from medium-carbon steel.
Applications/
Advantages
Used in road graders, scoop shovels and other heavy-duty equipment where a smooth surface is required at the spot of head
protrusion.
Material
Grade-5 Plow Bolts shall be made from a medium carbon steel which conforms to the following chemical composition
requirements: Carbon: 0.28% to 0.55%; Phosphorus: 0.048% maximum; Sulphur: 0.058% maximum.
Heat Treatment
Grade-5 Plow Bolts shall be heat treated, oil or water quenched, and tempered at a minimum tempering temperature of 800°F.
Core Hardness
Rockwell C25 - C34
Surface Hardness
Rockwell 30N 54 maximum
Proof Load
85,000 psi.
Yield Strength
92,000 psi. minimum
Tensile Strength
120,000 psi. minimum
Plating
See Appendix-A for plating information.
**
x
GRADE-8 PLOW BOLT
Description
A plow bolt made from alloy steel.
Applications/
Advantages
Greater tensile and proof load strength than a grade-5. Popular use is with bulldozer and snowplow blades.
Material
AISI 4037 and 4042 steel
Heat Treatment
Grade-8 Plow Bolts shall be heat treated, oil quenched and tempered at a minimum tempering temperature of 800°F.
Core Hardness
Rockwell C33 - C39
Surface Hardness
Rockwell 30N58.6 maximum
Proof Load
120,000 psi.
Yield Strength
130,000 psi. minimum
Tensile Strength
150,000 psi. minimum
Plating
Bolts are supplied unplated.
**Product standards require the manufacturer’s head marking to appear on the top of all bolts 1/4” diameter and larger. “X” represents one location such a marking may appear.
99
Plow Bolts
Cap Screws & Bolts
Clipped Head
L
A
H
T
50°
D
M
12° 30'
ref.
C
.040
approx.
PLOW BOLTS, CLIPPED HEAD
Nominal Size or Basic
Bolt Diameter
A
D
H
C
T
Width Across Flats
Full Head Diameter
Head
Height
Diameter at
Base of Head
Imperfect
Thread
Length
Max
Min
Max
Min
Max
Max
Min
Max
3/8-16
0.3750
.470
.445
.565
.535
.350
.455
.440
.156
7/16-14
0.4375
.510
.495
.620
.590
.350
.510
.495
.178
1/2-13
0.5000
.570
.555
.680
.650
.350
.570
.555
.192
± .062
Tolerance on Length
Description
Bolt with a countersunk, flat head, round neck and unified thread pitch, made from medium-carbon steel. The distinguishing
characteristic of this part is the way the head diameter is reduced at opposite sides with equal sized sections removed, leaving two flat
sides.
Applications/
Advantages
Used primarily in agricultural equipment.
Material
Grade-5 Clipped head Plow Bolts shall be made from a medium carbon steel which conforms to the following chemical composition
requirements: Carbon: 0.25% to 0.58%; Manganese: 0.060% minimum; Phosphorus: 0.048% maximum; Sulphur: 0.058% maximum.
Heat Treatment
Grade-5 Clipped head Plow Bolts shall be heat treated by quenching in a liquid medium from above the transformation temperature
and tempered at a minimum tempering temperature of 800°F.
Hardness
Rockwell C25 - C34
Yield Strength
92,000 psi.
Tensile Strength
120,000 psi. minimum
Reduction of Area
35% minimum
Plating
See Appendix-A for plating information.
100
Bolts & Cap Screws
Elevator Bolts
P
H
O
E
15˚
A
‡
L
‡Length of an elevator bolt is measured from the top of the head to the extreme end of the bolt.
ELEVATOR BOLTS
Nominal
Size
ANSI/ASME B18.5
E
A
H
O
P
Body Diameter
Head Diameter
Head Height
Square Width
Square Depth
Max.
Min.
Max.
Edge
Sharp
Min.
Edge
Sharp
Min.
Edge
Flat
Max.
Min.
Max.
Min.
Max.
Min.`
1/4
0.260
0.237
1.008
0.969
0.938
0.098
0.078
0.280
0.245
0.219
0.188
5/16
0.324
0.298
1.227
1.188
1.157
0.114
0.094
0.342
0.307
0.250
0.219
3/8
0.388
0.360
1.352
1.312
1.272
0.145
0.125
0.405
0.368
0.250
0.219
Nominal Bolt Length
Nominal Bolt Size
Tolerance on Length
1/4 thru 3/8
Up to 1 in., incl.
Over 1 in. to 2-1/2 in.,
incl.
Over 2-1/2 in. to 4 in.,
incl.
+0.02, -0.03
+0.02, -0.04
+0.04, -0.06
Description
Bolt with a wide, countersunk flat head, a shallow conical bearing surface, an integrally-formed square neck under the head, and a
unified thread pitch.
Applications/
Advantages
Popular use is in conveyor systems.
Material
AISI 1006 - 1050 or equivalent steel.
Core Hardness
1/4 through 3/8 in. diameter, all lengths: Rockwell B70 - B100
Proof Load
1/4 through 3/8 in. diameter, all lengths: 33,000 psi.
Yield Strength
1/4 through 3/8 in. diameter, all lengths: 36,000 psi. minimum
Tensile Strength
1/4 through 3/8 in. diameter, all lengths: 54,000 psi. minimum
Elongation
18% minimum (all sizes)
Reduction of Area
35% minimum (all sizes)
Minimum Thread
Length
The minimum length of thread shall be equal to twice the basic bolt diameter plus 0.25 in..
Plating
See Appendix-A for plating information.
101
Cap Screws & Bolts
Hanger Bolts
C
A
C
B
D
A
B
Hanger Bolt &
Stud
H ANGER BOLTS
C
A
B
D
C
Diameter
& Thread
Machine
Standard
Thread
Pitch
Length
Length
Lag
Thread
Length
Center
Space
5/8
1/4
3/8
-
3/4
3/8
3/8
-
2
7/8
1/4
5/8
-
2-1/4
6-32
8-32
10-24
1/4-20
A
Diameter
& Thread
Machine
Standard
Thread
Pitch
Length
Length
1-3/4
3/4
B
D
Lag
Center
Thread
Space
Length
1
-
1
1
-
1
1-1/4
Diameter
& Thread
Machine
Standard
Thread
Pitch
Length
Length
C
B
D
Lag
Thread
Length
Center
Space
5-1/2
1-1/2
3
1
6
1-1/2
3
1-1/2
2
1
1
-
5/16-18
A
1
3/8
5/8
-
2-1/2
1
1-1/2
-
2-1/2
1
1-1/2
-
5/8
1/4
3/8
-
2-3/4
1-1/4
1-1/2
-
3
1-1/2
1-1/2
-
3/4
3/8
3/8
-
3
1-1/2
1-1/2
-
3-1/2
1-1/2
2
-
7/8
1/4
5/8
-
3-1/2
1-1/2
2
-
4
2
2
-
1
3/8
5/8
-
4
2
2
-
4-1/2
1-1/8
3
3/8
1-1/4
5/8
5/8
-
4-1/2
1-1/8
3
3/8
5
1-3/8
3
5/8
1-1/2
5/8
7/8
-
5
1-3/8
3
5/8
5-1/2
1-1/2
3
1
1-3/4
3/4
1
-
6
1-1/2
3
1-1/2
6
1-1/4
3
1-3/4
2
1
1
-
1-1/2
5/8
7/8
-
8
2-1/2
3
2-1/2
1/4-20
3/8-16
1
3/8
5/8
-
1-3/4
3/4
1
-
10
2-1/2
3
4-1/2
1-1/4
5/8
5/8
-
2
1
1
-
12
2-1/2
3
6-1/2
1-1/2
5/8
7/8
-
2-1/4
1
1-1/4
-
14
2-1/2
3
8-1/2
1-3/4
3/4
1
-
2-1/2
1
1-1/2
-
3
1
2
-
2
1
1
-
2-3/4
1-1/4
1-1/2
-
3-1/2
1-1/2
2
-
2-1/2
1
1-1/2
-
3
1-1/2
1-1/2
-
4
2
2
-
3
1-1/2
1-1/2
-
3-1/2
1-1/2
2
-
5
2
3
-
3-1/2
1-1/2
2
-
3-3/4
1-3/4
2
-
6
2-1/2
3
1/2
1
3/8
5/8
-
4
2
2
-
8
2-1/2
3
2-1/2
1-1/4
5/8
5/8
-
4-1/2
1-1/8
3
3/8
10
2-1/2
3
4-1/2
1-1/2
5/8
7/8
-
5
1-3/8
3
5/8
12
2-1/2
3
6-1/2
Tolerance on Length
5/16-18
1/2-13
Up to 6": ± 1/16"
Over 6": ± 1/8"
Description
Bolt with threaded areas at both ends--lag screw thread at one end and bolt thread at the other. Standard hanger bolts
are designed for insertion into a predrilled pilot hole. The end of the wood thread is designed as a taper which is
threaded all the way to its blunt tip.
Applications / Advantages
Designed to hang material from wooden structures. The lag is wrenched into the wood and the assembly is completed
after applying a nut. Used for suspending electrical wiring and sheet metal. Also common in the furniture industry.
Material
Steel: AISI 1008 & 1010 steel Stainless: Type 303 or 304 stainless steel
Core Hardness (Steel only)
No. 10 through 3/8 in. diameter, all lengths: Rockwell B80 - B100
Tensile Strength (Steel only)
No. 10 through 3/8 in. diameter, all lengths: 74,000 psi. minimum
Plating
See Appendix-A for plating information.
102
Bolts & Cap Screws
Dowel Screws
B
A
A
Hanger Bolt &
Stud
DOWEL SCREWS
Diameter
& Thread
Pitch
A
Overall
Length
B
Thread
Lengths
Collar
Length
3/4
3/8
-
1
3/8
1/4
1
1/2
-
1-1/4
5/8
1-1/2
Diameter
& Thread
Pitch
A
Overall
Length
B
A
B
Thread
Lengths
Collar
Length
6
2-1/4
1-1/2
Diameter
& Thread
Pitch
Overall
Length
5/16-9
Thread
Lengths
Collar
Length
1-3/4
3/4
1/4
2
7/8
1/4
2
7/8
1/4
2-1/2
1-1/8
1/4
2-1/2
1-1/8
1/4
-
3
1-3/8
1/4
3
1-3/8
1/4
5/8
1/4
3-1/2
1-5/8
1/4
3-1/2
1-5/8
1/4
1
1/2
-
1-1/2
3/4
-
4
1-5/8
3/4
1-1/4
1/2
1/4
1-3/4
3/4
1/4
4-1/2
2-1/4
-
1-1/2
3/4
-
2
7/8
1/4
5
2-1/4
1/2
1-3/4
3/4
1/4
2-1/2
1-1/8
1/4
6
2-1/4
1-1/2
2
7/8
1/4
3
1-3/8
1/4
8
3
2
2-1/4
7/8
1/2
3-1/2
1-5/8
1/4
4
2
-
2-1/2
1-1/8
1/4
4
1-5/8
3/4
5
2
1
#6-18
#8-15
1/4-10
3/8-7
#10-11
5/16-9
1/2-6
1/4-10
3
1-3/8
1/4
4-1/2
2-1/4
-
6
3
-
1-1/2
3/4
-
5
2-1/4
1/2
8
3
2
Tolerance on Length
Up to 6": ± 1/16"
Over 6": ± 1/8"
Description
A headless fastener with a lag thread at both ends. They are designed to be inserted into a predrilled pilot hole. The end
of the wood thread is designed as a taper that is threaded all the way to its blunt tip.
Applications / Advantages
Used for fastening two pieces of wood so as to keep them permanently in their proper relative position, usually set apart
from each other.
Material
AISI 1008 & 1010 steel
Core Hardness
3/16 through 3/8 in. diameter, all lengths: Rockwell B70 - B100
Tensile Strength
3/16 through 3/8 in. diameter, all lengths: 60,000 psi. minimum
Plating
See Appendix-A for plating information.
103
Cap Screws & Bolts
Forged Eye Bolts
Plain & Shoulder
Patterns
D U
M
R Y E
M
R Y E
S
S
H
J
L
T
H
L
SHOULDER PATTERN
PLAIN PATTERN
F ORGED EYEBOLTS, P LAIN PATTERN
S
Nominal Size
H
Y
R
ANSI/ASME B18.15
E
L
Shank Length
Shank
Dia.
Long
Length
Short
Length
Eye ID
Nominal
Eye OD
Eye Sect.
Diameter
Overall
Length
M
Min Length Full
Thread
Long
Length
Short
Length
Thread
Size
UNC-2A
1/4
0.25
0.25
0.28
1.00
1.06
1.00
1.06
0.69
0.81
1.19
0.19
0.25
2.06
2.38
0.75
0.75
1/4-20 or
.250-20
5/16
0.31
0.31
0.34
1.12
1.19
1.06
1.13
0.81
0.94
1.44
0.25
0.31
2.44
2.75
0.81
0.75
5/16-18 or
.3125-18
3/8
0.38
0.38
0.41
1.25
1.38
1.12
1.25
0.94
1.06
1.69
0.31
0.38
2.81
3.19
0.88
0.75
3/8-16 or
.375-16
7/16
0.44
0.44
0.47
1.38
1.50
1.13
1.25
1.00
1.12
1.81
0.34
0.41
3.06
3.44
1.00
0.75
7/16-14 or
.4375-14
1/2
0.50
0.50
0.53
1.50
1.62
1.13
1.25
1.12
1.25
2.12
0.44
0.50
3.50
3.88
1.12
0.75
1/2-13 or
.500-13
9/16
0.56
0.56
0.59
1.62
1.75
1.21
1.34
1.19
1.31
2.25
0.47
0.53
3.75
4.12
1.25
0.84
9/16-12 or
.5625-12
5/8
0.62
0.62
0.66
1.75
1.88
1.31
1.44
1.31
1.44
2.56
0.56
0.62
4.19
4.56
1.38
0.94
5/8-11 or
.625-11
3/4
0.75
0.75
0.78
2.00
2.12
1.50
1.62
1.44
1.56
2.81
0.62
0.69
4.69
5.06
1.62
1.13
3/4-10 or
.750-10
7/8
0.88
0.88
0.91
2.25
2.38
1.75
1.88
1.56
1.69
3.19
0.75
0.81
5.31
5.69
1.81
1.31
7/8-9 or
.875-9
1
1.00
1.00
1.06
2.50
2.62
1.94
2.06
1.69
1.81
3.56
0.88
0.94
5.94
6.31
2.06
1.50
1-8 or
1.000-8
1-1/8
1.12
1.12
1.19
2.75
2.88
2.13
2.26
1.94
2.06
4.06
1.00
1.06
6.69
7.06
2.31
1.69
1-1/8-7 or
1.125-7
1-1/4
1.25
1.25
1.34
3.00
3.12
2.38
2.50
2.12
2.25
4.44
1.09
1.16
7.31
7.69
2.50
1.88
1-1/4-7 or
1.250-7
1-1/2
1.50
1.50
1.59
3.50
3.62
2.75
2.87
2.44
2.56
5.19
1.31
1.38
8.56
8.94
3.00
2.25
1-1/2-6 or
1.500-6
1-3/4
1.75
1.75
1.84
3.75
3.88
3.18
3.31
2.75
3.00
6.00
1.50
1.62
9.50
10.12
3.19
2.62
1-3/4-5 or
1.750-5
2
2.00
2.00
2.09
4.00
4.25
3.62
3.87
3.06
3.44
6.88
1.75
1.88
10.56
11.44
3.38
3.00
2-4-1/2 or
2.000-4.50
2-1/2
2.50
2.50
2.62
5.00
5.25
4.50
4.75
3.81
4.19
8.50
2.19
2.31
13.19
14.06
4.25
3.75
2-1/2-4 or
2.500-4
104
Plain & Shoulder
Patterns
Bolts & Cap Screws
Forged Eye Bolts
ANSI/ASME
B18.15
F ORGED EYEBOLTS , SHOULDER PATTERN
S
Nominal
Size
Shank
Diam.
H
Y
Shank Length
Long Short
Length Length
R
Eye
ID
Nominal
Eye
OD
E
L
M
J
Min Length Full
Eye
Thread
Overall
Sect.
Length
Long
Short
Diam.
Length Length
Thread
Size
UNC-2A
D
T
U
Center
Radius
line Eye Shoulder Shoulder
Under
Diam.
Height
To
Shoulder
Shoulder
0.25
0.25
0.28
1.00
1.06
1.00
1.06
0.69
0.81
1.19
0.19
0.25
2.22
2.53
0.75
0.75
1/4-20 or
.250-20
0.69
0.81
0.50
0.56
0.12
0.19
0.015
0.025
5/16 0.31
0.31
0.34
1.12
1.19
1.06
1.13
0.81
0.94
1.44
0.25
0.31
2.66
2.97
0.81
0.75
5/16-18 or
.3125-18
0.88
1.00
0.56
0.62
0.12
0.19
0.015
0.025
3/8
0.38
0.38
0.41
1.25
1.38
1.12
1.25
0.94
1.06
1.69
0.31
0.38
3.09
3.47
0.88
0.75
3/8-16 or
.375-16
1.06
1.19
0.62
0.69
0.12
0.19
0.015
0.025
7/16 0.44
0.44
0.47
1.38
1.50
1.13
1.25
1.00
1.12
1.81
0.34
0.41
3.41
3.78
1.00
0.75
7/16-14 or
.4375-14
1.19
1.31
0.75
0.81
0.19
0.25
0.015
0.025
1/2
0.50
0.50
0.53
1.50
1.62
1.13
1.25
1.12
1.25
2.12
0.44
0.50
3.81
4.19
1.12
0.75
1/2-13 or
.500-13
1.31
1.44
0.88
0.94
0.19
0.25
0.015
0.025
9/16 0.56
0.56
0.59
1.62
1.75
1.21
1.34
1.19
1.31
2.25
0.47
0.53
4.19
4.56
1.25
0.84
9/16-12 or
.5625-12
1.50
1.62
0.94
1.00
0.22
0.28
0.020
0.045
5/8
0.62
0.62
0.66
1.75
1.88
1.31
1.44
1.31
1.44
2.56
0.56
0.62
4.56
4.94
1.38
0.94
5/8-11 or
.625-11
1.59
1.72
1.00
1.06
0.25
0.31
0.020
0.045
3/4
0.75
0.75
0.78
2.00
2.12
1.50
1.62
1.44
1.56
2.81
0.62
0.69
5.06
5.50
1.62
1.12
3/4-10 or
.750-10
1.72
1.91
1.12
1.25
0.25
0.31
0.020
0.045
7/8
0.88
0.88
0.91
2.25
2.38
1.75
1.88
1.56
1.69
3.19
0.75
0.81
5.75
6.19
1.81
1.31
7/8-9 or
.875-9
2.03
2.22
1.31
1.44
0.31
0.38
0.040
0.065
1
1.00
1.00
1.06
2.50
2.62
1.94
2.06
1.69
1.81
3.56
0.88
0.94
6.44
6.88
2.06
1.50
1-8 or
1.000-8
2.22
2.41
1.50
1.62
0.38
0.44
0.060
0.095
1-1/8 1.12
1.12
1.19
2.75
2.88
2.13
2.26
1.94
2.06
4.06
1.00
1.06
7.31
7.75
2.31
1.69
1-1/8-7 or
1.125-7
2.59
2.78
1.69
1.81
0.44
0.50
0.060
0.095
1-1/4 1.25
1.25
1.34
3.00
3.12
2.38
2.50
2.12
2.25
4.44
1.09
1.16
8.00
8.44
2.50
1.88
1-1/4-7 or
1.250-7
2.84
3.03
1.88
2.00
0.50
0.56
0.060
0.095
1-1/2 1.50
1.50
1.59
3.50
3.62
2.75
2.87
2.44
2.56
5.19
1.31
1.38
9.22
9.72
3.00
2.25
1-1/2-6 or
1.500-6
3.19
3.44
2.12
2.25
0.50
0.62
0.060
0.095
1-3/4 1.75
1.75
1.84
3.75
3.88
3.18
3.31
2.75
3.00
6.00
1.50
1.62
10.50
11.12
3.19
2.62
1-3/4-5 or
1.750-5
3.88
4.12
2.50
2.62
0.50
0.62
0.060
0.095
2.00
2.09
4.00
4.12
3.62
3.79
3.06
3.44
6.88
1.75
1.88
11.53
12.22
3.38
3.00
2-4-1/2 or
2.000-4.50
4.25
4.50
2.88
3.00
0.62
0.75
0.060
0.095
1/4
2
2.00
Description
A forged bolt without welds, with a head in the form of an open or closed anchor ring. Bolt shall have a unified thread pitch.
Shoulder pattern eyebolts shall have an unthreaded shoulder below the anchor ring which is greater in diameter than the threaded
shank.
Applications/
Advantages
Used in applications where a forged shank is required, ie. in a rigging when mounted atop a uniformly distributed weight.
Material
Eyebolts shall be made from a carbon steel which conforms to the following chemical composition requirements-- Carbon: 0.48%
maximum; Manganese: 1.00% maximum; Phosphorus: 0.040% maximum; Sulfur: 0.050 maximum; Silicon: 0.15-0.35%
Heat Treatment
Bolts shall be liquid quenched and tempered before machining the threaded end.
Grain Size
ASTM No. 5 or finer
Tensile Strength
65,000 - 85,000 psi.
Yield Strength
30,000 psi. minimum
Elongation in 2 in.
30% minimum
Reduction of Area
60% minimum
Plating
See Appendix-A for plating information.
105
Cap Screws & Bolts
Slotted Flat Cap Screws
‡
L
A
A MIN
EDGE OF HEAD MAY BE
ROUNDED OR FLAT
T
R
J
80˚82˚
C
F
PROTRUSION GAUGE
B
H
‡Length of a slotted flat cap screw is measured from the top of the head to the extreme end of the screw.
SLOTTED FLAT COUNTERSUNK HEAD CAP SCREWS
Nominal Size or
Basic Screw
Diameter
ANSI B18.6.2
F
A
H
J
T
R
C
Body Diameter
Head Diameter
Head
Height
Slot Width
Slot Depth
Fillet
Radius
Protrusion
Above Gaging
Diameter
Max
Min
Max,
Edge
Sharp
B
Min,Edge
Rounded
or Flat
Ref
Max
Min
Max
Min
Max
Max
Min
Gaging
Diameter
1/2
0.5000
0.5000
0.4930
0.875
0.791
0.210
0.106
0.091
0.103
0.068
0.200
0.071
0.049
0.756
5/8
0.6250
0.6250
0.6170
1.125
1.020
0.281
0.133
0.116
0.137
0.091
0.250
0.085
0.058
0.982
3/4
0.7500
0.7500
0.7420
1.375
1.251
0.352
0.149
0.131
0.171
0.115
0.300
0.099
0.068
1.208
Nominal Screw Length
Nominal Screw Size
Tolerance on Length
1/2 thru 3/4
Up to 1 in., incl.
Over 1 to 2-1/2 in., incl.
Over 2-1/2 to 6 in., incl.
-0.03
-0.06
-0.08
Description
Flat, countersunk screw with a flat top surface, milled slot, and a conical bearing surface with a head angle of 82°.
Applications/
Advantages
For assembling close tolerance machinery where head clearance is critical.
Material
AISI 1006 - 1050 or equivalent steel.
Core Hardness
1/2 through 3/4 in. diameter, all lengths: Rockwell B80 - B100
Proof Load
1/2 through 3/4 in. diameter, all lengths: 55,000 psi.
Tensile Strength
1/2 through 3/4 in. diameter, all lengths: 74,000 psi. minimum
Thread Length
The length of full-form thread shall be equal to twice the basic screw diameter plus 0.250 in. with a tolerance of +0.188 in..
Plating
See Appendix-A for plating information.
106
Bolts & Cap Screws
Square Bolts
C
H
R
H
Cut Thread
Rolled Thread
R
B
B
LT
o
25 Approx
‡
W
LT
o
25 Approx
L‡
L
UNDERSIDE OF HEAD
ANSI/ASME
B18.2.1
S QUARE BOLTS
Nominal Size or
Basic Product
Diameter
B
W
C
Body Diameter
Width Across
Flats
Width Across
Corners
Max
Max
Max
Min
Min
H
Min
R
Head Height
Max
Min
LT
Radius of Fillet
Max
Min
Thread Length for
Bolt Lengths
6 in. &
Shorter
over 6
in.
Basic
Basic
1/4
0.2500
0.260
0.237
0.375
0.362
0.530
0.498
0.188
0.156
0.03
0.01
0.750
1.000
5/16
0.3125
0.324
0.298
0.500
0.484
0.707
0.665
0.220
0.186
0.03
0.01
0.875
1.125
3/8
0.3750
0.388
0.360
0.562
0.544
0.795
0.747
0.268
0.232
0.03
0.01
1.000
1.250
7/16
0.4375
0.452
0.421
0.625
0.603
0.884
0.828
0.316
0.278
0.03
0.01
1.125
1.375
1/2
0.5000
0.515
0.482
0.750
0.725
1.061
0.995
0.348
0.308
0.03
0.01
1.250
1.500
5/8
0.6250
0.642
0.605
0.938
0.906
1.326
1.244
0.444
0.400
0.06
0.02
1.500
1.750
3/4
0.7500
0.768
0.729
1.125
1.088
1.591
1.494
0.524
0.476
0.06
0.02
1.750
2.000
7/8
0.8750
0.895
0.852
1.312
1.269
1.856
1.742
0.620
0.568
0.06
0.02
2.000
2.250
1
1.0000
1.022
0.976
1.500
1.450
2.121
1.991
0.684
0.628
0.09
0.03
2.250
2.500
1 1/8
1.1250
1.149
1.098
1.688
1.631
2.386
2.239
0.780
0.720
0.09
0.03
2.500
2.750
1 1/4
1.2500
1.277
1.223
1.875
1.812
2.652
2.489
0.876
0.812
0.09
0.03
2.750
3.000
1 3/8
1.3750
1.404
1.345
2.062
1.994
2.917
2.738
0.940
0.872
0.09
0.03
3.000
3.250
1 1/2
1.5000
1.531
1.470
2.250
2.175
3.182
2.986
1.036
0.964
0.09
0.03
3.250
3.500
Nominal Screw
Size
Tolerance on Length
Nominal Screw Length
Up to 1 in., incl.
Over 1 in. to
2 1/2 in., incl.
-0.04
Over 2 1/2 in. to
4 in., incl.
+0.04
-0.06
Over 4 in. to
6 in., incl.
+0.06
-0.10
Longer than 6 in.
1/4 to 3/8
+0.02
-0.03
+0.02
+0.10
-0.18
7/16 and 1/2
+0.02
-0.03
+0.04
-0.06
+0.06
-0.08
+0.08
-0.10
+0.12
-0.18
9/16 to 3/4
+0.02
-0.03
+0.06
-0.08
+0.08
-0.10
+0.10
-0.10
+0.14
-0.18
7/8 and 1
....
....
+0.08
-0.10
+0.10
-0.14
+0.12
-0.16
+0.16
-0.20
1 1/8 to 1 1/2
....
....
+0.12
-0.12
+0.16
-0.16
+0.18
-0.18
+0.22
-0.22
‡Length of a square bolt is measured from the underhead bearing surface to the extreme end of the bolt.
Description
A low or medium carbon steel, externally threaded mechanical device 1/4" diameter or larger, with a trimmed square shaped external
wrenching head.
Applications/
Advantages
Offers greater bearing surface for wrenching than hex head bolts.
Material
Bolts shall be made from a carbon steel which conforms to the following chemical composition requirements-Phosphorus: 0.06% maximum; Sulfur: 0.15% maximum
Hardness
Bolts of a length less than 3 times diameter: Rockwell B69-100
Bolts of a length 3 times diameter and longer: Rockwell B100 maximum
Tensile Strength
60,000 psi. minimum
Elongation in 2 in.
18% minimum
Plating
See Appendix-A for plating information.
107
Cap Screws & Bolts
External Thread Dimensions
E XTERNAL T HREADS - CLASS 2A
108
Major Diameter
Series
Designation
Allowance
4-40
UNC
6-32
Nominal Size
ASME B1.1
Pitch Diameter
Max
Min
Max
Min
Tolerance
0.0008
0.1112
0.1061
0.0950
0.0925
0.0025
UNC
0.0008
0.1372
0.1312
0.1169
0.1141
0.0028
8-32
UNC
0.0009
0.1631
0.1571
0.1428
0.1399
0.0029
10-24
UNC
0.0010
0.1890
0.1818
0.1619
0.1586
0.0033
10-32
UNF
0.0009
0.1891
0.1831
0.1688
0.1658
0.0030
1/4-20
UNC
0.0011
0.2489
0.2408
0.2164
0.2127
0.0037
1/4-28
UNF
0.0010
0.2490
0.2425
0.2258
0.2225
0.0033
5/16-18
UNC
0.0012
0.3113
0.3026
0.2752
0.2712
0.0040
5/16-24
UNF
0.0011
0.3114
0.3042
0.2843
0.2806
0.0037
3/8-16
UNC
0.0013
0.3737
0.3643
0.3331
0.3287
0.0044
3/8-24
UNF
0.0011
0.3739
0.3667
0.3468
0.3430
0.0038
7/16-14
UNC
0.0014
0.4361
0.4258
0.3897
0.3850
0.0047
7/16-20
UNF
0.0013
0.4362
0.4281
0.4037
0.3995
0.0042
1/2-13
UNC
0.0015
0.4985
0.4876
0.4485
0.4435
0.0050
1/2-20
UNF
0.0013
0.4987
0.4906
0.4662
0.4619
0.0043
9/16-12
UNC
0.0016
0.5609
0.5495
0.5068
0.5016
0.0052
9/16-18
UNF
0.0014
0.5611
0.5524
0.5250
0.5205
0.0045
5/8-11
UNC
0.0016
0.6234
0.6113
0.5644
0.5589
0.0055
5/8-18
UNF
0.0014
0.6236
0.6149
0.5875
0.5828
0.0047
3/4-10
UNC
0.0018
0.7482
0.7353
0.6832
0.6773
0.0059
3/4-16
UNF
0.0015
0.7485
0.7391
0.7079
0.7029
0.0050
7/8-9
UNC
0.0019
0.8731
0.8592
0.8009
0.7946
0.0063
7/8-14
UNF
0.0016
0.8734
0.8631
0.8270
0.8216
0.0054
1-8
UNC
0.0020
0.9980
0.9830
0.9168
0.9100
0.0068
1-14
UNS
0.0017
0.9983
0.9880
0.9519
0.9463
0.0056
1 1/8-7
UNC
0.0022
1.1228
1.1064
1.0300
1.0228
0.0072
1 1/8-12
UNF
0.0018
1.1232
1.1118
1.0691
1.0631
0.0060
1 1/4-7
UNC
0.0022
1.2478
1.2314
1.1550
1.1476
0.0074
1 1/4-12
UNF
0.0018
1.2482
1.2368
1.1941
1.1879
0.0062
1 3/8-6
UNC
0.0024
1.3726
1.3544
1.2643
1.2563
0.0080
1 1/2-6
UNC
0.0024
1.4976
1.4794
1.3893
1.3812
0.0081
1 3/4-5
UNC
0.0027
1.7473
1.7268
1.6174
1.6085
0.0089
2-4.5
UNC
0.0029
1.9971
1.9751
1.8528
1.8433
0.0095
2 1/2-4
UNC
0.0031
2.4969
2.4731
2.3345
2.3241
0.0104
2 3/4-4
UNC
0.0032
2.7468
2.7230
2.5844
2.5739
0.0105
3-4
UNC
0.0032
2.9968
2.9730
2.8344
2.8237
0.0107