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CAP SCREWS AND BOLTS

External Threads - Class 2A

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Nominal Size &Threads/lnch & Series Designation Allowance Major Diameter Pitch Diameter
Max Min Max Min Tolerance
0-80
1-64
1-72
2-56
2-64		 UNF
UNC
UNF
UNG
UNF		 0.0005
0.0006
0.0006
0.0006
0.0006		 0.0595
0.0724
0.0724
0.0854
0.0854		 0.0563
0.0686
0.0689
0.0813
0.0816		 0.0514
0.0623
0.0634
0.0738
0.0753		 0.0496
0.0603
0.0615
0.0717
0.0733		 0.0018
0.0020
0.0019
0.0021
0.0020
3-48
3-56
4-40
4-48
5-40		 UNG
UNF
UNG
UNF
UNC		 0.0007
0.0007
0.0008
0.0007
0.0008		 0.0938
0.0983
0.1112
0.1113
0.1242		 0.0938
0.0942
0.1061
0.1068
0.1191		 0.0848
0.0867
0.0950
0.0978
0.1080		 0.0825
0.0845
0.0925
0.0954
0.1054		 0.0023
0.0022
0.0025
0.0024
0.0026
5-44
6-32
6-40
8-32
8-36		 UNF
UNG
UNF
UNG
UNF		 0.0007
0.0008
0.0008
0.0009
0.0008		 0.1243
0.1372
0.1372
0.1631
0.1632		 0.1195
0.1312
0.1321
0.1571
0.1577		 0.1095
0.1169
0.1210
0.1428
0.1452		 0.1070
0.1141
0.1184
0.1399
0.1424		 0.0025
0.0028
0.0026
0.0029
0.0028
10-24
10-32
12-24
12-28
1/4-20		 UNG
UNF
UNG
UNF
UNG		 0.0010
0.0009
0.0010
0.0010
0.0011		 0.1890
0.1891
0.2150
0.2150
0.2489		 0.1818
0.1831
0.2078
0.2085
0.2408		 0.1619
0.1688
0.1879
0.1918
0.2164		 0.1586
0.1658
0.1845
0.1886
0.2127		 0.0033
0.0030
0.0034
0.0032
0.0037
1/4-28
5/16-18
5/16-24
3/8-16
3/8-24		 UNF
UNG
UNF
UNG
UNF		 0.0010
0.0012
0.0011
0.0013
0.0011		 0.2490
0.3113
0.3114
0.3737
0.3739		 0.2425
0.3026
0.3042
0.3643
0.3667		 0.2258
0.2752
0.2843
0.3331
0.3468		 0.2225
0.2712
0.2806
0.3287
0.3430		 0.0033
0.0040
0.0037
0.0044
0.0038
7/16-14
7/16-20
1/2-13
1/2-20
9/16-12		 UNG
UNF
UNG
UNF
UNG		 0.0014
0.0013
0.0015
0.0013
0.0016		 0.4361
0.4362
0.4985
0.4987
0.5609		 0.4258
0.4281
0.4876
0.4906
0.5495		 0.3897
0.4037
0.4485
0.4662
0.5068		 0.3850
0.3995
0.4435
0.4619
0.5016		 0.0047
0.0042
0.0050
0.0043
0.0052
9/16-18
5/8-11
5/8-18
3/4-10
3/4-16		 UNF
UNG
UNF
UNG
UNF		 0.0014
0.0016
0.0014
0.0018
0.0015		 0.5611
0.6234
0.6236
0.7482
0.7485		 0.5524
0.6113
0.6149
0.7353
0.7391		 0.5250
0.5644
0.5875
0.6832
0.7079		 0.5205
0.5589
0.5828
0.6773
0.7029		 0.0045
0.0055
0.0047
0.0059
0.0050
7/8-9
7/8-14
1-8
1-12
1-14		 UNG
UNF
UNG
UNF
UNS		 0.0019
0.0016
0.0020
0.0018
0.0017		 0.8731
0.0834
0.9980
0.9982
0.9983		 0.8592
0.8631
0.9830
0.9868
0.9880		 0.8009
0.8270
0.9168
0.9441
0.9519		 0.7946
0.8216
0.9100
0.9382
0.9463		 0.0063
0.0054
0.0068
0.0059
0.0056
11/8-7
11/8-8
11/8-12
11/4-7
1114-8		 UNG
UN
UNF
UNG
UN		 0.0022
0.0021
0.0018
0.022
0.0021		 1.1228
1.1229
1.1232
1.2478
1.2479		 1.1064
1.1079
1.1118
1.2314
1.2329		 1.0300
1.0417
1.0691
1.1550
1.1667		 1.0228
1.0348
1.0631
1.1476
1.1597		 0.0072
0.0069
0.0060
0.0074
0.0070
11/4-12
1 3/8-6
1 3/8-8
1 3/8-12
11/2-6		 UNF
UNC
UN
UNF
UNC		 0.0018
0.0024
0.0022
0.0019
0.0024		 1.2482
1.3726
1.3728
1.3731
1.4976		 1.2368
1.3544
1.3578
1.3617
1.4794		 1.1941
1.2643
1.2916
1.3190
1.3893		 1.1879
1.2563
1.2844
1.3127
1.3812		 0.0062
0.0080
0.0072
0.0063
0.0081
1 1/2-8
1 1/2-12
1 5/8-8
1 3/4-5
1 3/4-8		 UN
UNC
UN
UNC
UN		 0.0022
0.0019
0.0022
0.0027
0.0023		 1.4978
1.4981
1.6228
1.7473
1.7477		 1.4828
1.4867
1.6087
1.7268
1.7327		 1.4166
1.4440
1.5416
1.6174
1.6665		 1.4093
1.4376
1.5342
1.6085
1.6590		 0.0073
0.0064
0.0074
0.0089
0.0075
1 7/8-8
2-4 1/2
2-8
2 1/4-4.5
2 1/4-8		 UN
UNC
UN
UNC
UN		 0.0023
0.0029
0.0023
0.0029
0.0024		 1.8727
1.9971
1.9977
2.2471
2.2476		 1.8577
1.9751
1.9827
2.2251
2.2326		 1.7915
1.8528
1.9165
2.1028
2.1664		 1.7838
1.8433
1.9087
2.0931
2.1584		 0.0077
0.0095
0.0078
0.0097
0.0080
2 1/2-4
2 1/2-8
2 3/4-4
2 3/4-8
3-4		 UNC
UN
UNC
UN
UNC		 0.0031
0.0024
0.0032
0.0025
0.0032		 2.4969
2.4976
2.7468
2.7475
2.9968		 2.4731
2.4826
2.7230
2.7325
2.9730		 2.3345
2.4164
2.5844
2.6663
2.8344		 2.3241
2.4082
2.5739
2.6580
2.8237		 0.0104
0.0082
0.0105
0.0083
0.0107
3-8
3 1/4-4
3 1/4-8
3 1/2-4
3 1/2-8		 UN
UNC
UN
UNC
UN		 0.0026
0.0033
0.0026
0.0033
0.0026		 2.9974
3.2467
3.2474
3.4967
3.4974		 2.9824
3.2229
3.2324
3.4729
3.4824		 2.9162
3.0843
3.1662
3.3343
3.4162		 2.9077
3.0734
3.1575
3.3233
3.4074		 0.0085
0.0109
0.0087
0.0110
0.0088
3 3/4-4
3 3/4-8
4-4
4-8		 UNC
UN
UNC
UN		 0.0034
0.0027
0.0034
0.0027		 3.7466
3.7473
3.9966
3.9973		 3.7228
3.7323
3.9728
3.9823		 3.5842
3.6661
3.8342
3.9161		 3.5730
3.6571
3.8229
3.9070		 0.0112
0.0090
0.0113
0.0091

 

Lag Screws
Hex Head		 Hex Head Lag Screws
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Basic Product Diameter Threads per Inch E F G H S
Body or Shoulder
Diameter		 Width
Across
Flats

Hex Lag Screws

 Shoulder Length
Width
Across
Corners		 Head
Height
Max. Min. Basic Max. Min. Max. Min. Basic Max. Min. Min.
1/4 0.2500
5/16 0.3125
10
9		 0.260
0.324		 0.237
0.298		 7/16
1/2		 0.438
0.500		 0.425
0.484		 0.505
0.577		 0.484
0.552		 11/64
7/32		 0.188
0.235		 0.150
0.195		 0.094
0.125
3/8 0.3750
7/16 0.4375
1/2 0.5000
7
7
6		 0.388
0.452
0.515		 0.360
0.421
0.482		 9/16
5/8
3/4		 0.562
0.625
0.750		 0.544
0.603
0.725		 0.650
0.722
0.866		 0.620
0.687
0.826		 1/4
19/64
11/32		 0.268
0.316
0.364		 0.226
0.272
0.302		 0.125
0.156
0.156
5/8 0.6250
3/4 0.7500
5
4-1/2		 0.642
0.768		 0.605
0.729		 15/16
1-1/8		 0.938
1.125		 0.906
1.088		 1.083
1.299		 1.033
1.240		 27/64
1/2		 0.444
0.524		 0.378
0.455		 0.312
0.375

 

Carriage Bolts

Round Head Square Neck Bolts

 Carriage Bolts
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Basic Bolt
Diameter		 E A H 0 P
Body
Diameter		 Head
Diameter		 Head
Height		 Square
Width		 Square
Depth
Max. Min. Max. Min. Max. Min. Max. Min. Max. Min.
10 0.1900
1/4 0.2500
5/16 0.3125
3/8 0.3750
0.199
0.260
0.324
0.388		 0.182
0.237
0.298
0.360		 0.469
0.594
0.719
0.844		 0.438
0.563
0.688
0.782		 0.114
0.145
0.176
0.208		 0.094
0.125
0.156
0.188		 0.199
0.260
0.324
0.388		 0.185
0.245
0.307
0.368		 0.125
0.156
0.187
0.219		 0.094
0.125
0.156
0.188
7/16 0.4375
1/2 0.5000
5/8 0.6250
3/4 0.7500
0.452
0.515
0.642
0.768		 0.421
0.483
0.605
0.729		 0.969
1.094
1.344
1.594		 0.907
1.032
1.219
1.469		 0.239
0.270
0.344
0.406		 0.219
0.250
0.313
0.375		 0.452
0.515
0.642
0.768		 0.431
0.492
0.616
0.741		 0.250
0.281
0.344
0.406		 0.219
0.250
0.313
0.375

Dowel Screws

Dowel Screws

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Size A B
Thread Length Collar Length
3/16-11 xl 1/2
  x2
  x2 1/2
  x3
  3/4  
  7/8  
  11/8  
  1 3/8  
  --  
  1/4  
  1/4  
  1/4  
1/4-10 xl 1/2
  x2
  x2 1/2
  x3
  x3 1/2
  3/4  
  7/8  
  11/8  
  1 3/8  
  1 5/8  
  --  
  1/4  
  1/4  
  1/4  
  1/4  
5/16-9 xl 1/2
  xl 3/4
  x2
  x2 1/2
  x3
  x3 1/2
  x4
  3/4  
  3/4  
  7/8  
  1 1/8  
  1 3/8  
  1 5/8  
  1 5/8  
  --  
  1/4  
  1/4  
  1/4  
  1/4  
  1/4  
  3/4  
3/8-7 x2 1/2
  x3
  x3 1/2
  x4
  1 1/8  
  1 3/8  
  1 5/8  
  1 5/8  
  1/4  
  1/4  
  1/4  
  3/4  

 

Elevator Bolts Elevator Bolts
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Nominal Size or
Basic Bolt
Diameter		 E

Body
Diameter

 A H

Head
Height

 0 P
Head Diameter Square
Width		 Square
Depth
Max.
Edge
Sharp		 Min.
Edge
Sharp		 Min.
Edge
Flat
Max. Min. Max. Min. Max. Min. Max. Min.
1/4 0.2500
5/16 0.3125
3/8 0.3750
0.260
0.324
0.388		 0.237
0.298
0.360		 1.008
1.227
1.352		 0.969
1.188
1.312		 0.938
1.157
1.272		 0.098
0.114
0.145		 0.087
0.094
0.125		 0.280
0.342
0.405		 0.245
0.307
0.368		 0.219 0.250 0.250 0.188
0.219
0.219

 

Tap Bolts Tap Bolts
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Nominal
Or Basic		 E F G H
Body Diameter Width Across Flats Width Across Corners Head
Height
Product Diam. Max. Min. Basic Max. Min. Max. Min. Basic Max. Min.
1/4 0.2500
5/16 0.3125
3/8 0.3750
7/16 0.4375
0.2500
0.3125
0.3750
0.4375		 0.2450
0.3065
0.3690
0.4305		 7/16
1/2
9/16
5/8		 0.438
0.500
0.562
0.625		 0.428
0.489
0.551
0.612		 0.505
0.577
0.650
0.722		 0.488
0.557
0.628
0.698		 5/32
13/64
15/64
9/32		 0.163
0.211
0.243
0.291		 0.150
0.195
0.226
0.272
1/2 0.5000
9/16 0.5625
5/8 0.6250
3/4 0.7500
0.5000
0.5625
0.6250
0.7500		 0.4930
0.5545
0.6170
0.7410		 3/4
13/16
15/16
1-1/8		 0.750
0.812
0.938
1.125		 0.736
0.798
0.922
1.100		 0.866
0.938
1.083
1.299		 0.840
0.910
1.051
1.254		 5/16
23/64
25/64
15/32		 0.323
0.371
0.403
0.483		 0.302
0.348
0.378
0.455
7/8 0.8750
1 1.0000
1-1/8 1.1250
1-1/4 1.2500
0.8750
1.0000
1.1250
1.2500		 0.8660
0.9900
1.1140
1.2390		 1-5116
1-1/2
1-11/16
1-7/8		 1.312
1.500
1.688
1.875		 1.285
1.469
1.631
1.812		 1.516
1.732
1.949
2.165		 1.465
1.675
1.859
2.066		 35/64
39/64
11/16
25/32		 0.563
0.627
0.718
0.813		 0.531
0.591
0.658
0.749
1-3/8 1.3750
1-1/2 1.5000
1.3750
1.5000		 1.3630
1.4880		 2-1/6
2-1/4		 2.062
2.250		 1.994
2.175		 2.382
2.598		 2.273
2.480		 27/32
15/16		 0.878
0.974		 0.810
0.902

 

No.3 Head Plow Bolts
No. 3 Head Plow Bolts No. 3 Head Plow Bolt
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D A L S B
Nominal
Diameter of Bolt		 Diameter of Head Feed Thickness Depth of Square and Head Width of Square
Max. Min.
Sharp		 Abs. Min. With Flat Max. Max. Min. Max. Min.
(Basic)
3/8
7/16		 0.708
0.826		 0.671
0.781		 0.656
0.766		 0.031
0.036		 0.312
0.364		 0.281
0.328		 0.387
0.450		 0.375
0.438
1/2
5/8
3/4		 0.945
1.147
1.303		 0.890
1.094
1.250		 0.875
1.063
1.219		 0.042
0.050
0.050		 0.417
0.506
0.541		 0.375
0.456
0.491		 0.515
0.640
0.765		 0.500
0.625
0.750

 

 

Slotted Flat Countersunk
Head Cap Screws
Slotted Flat Countersunk Head Cap Screws

Table 1 Dimensions of Slotted Flat Countersunk Head Cap Screws

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Nominal
Size or Basic Screw Diameter		 F A H J T R C B
Body Diameter Head Diameter Head Height Slot Width Slot Depth Fillet Radius Protrusion Above Gaging
Diameter		 Gaging Dia.
Max, Edge Sharp Min,
Edge Rounded
or Flat
Max Min Ref Max Min Max Min Max Max Min
1/4 0.2500
5/16 0.3125
3/8 0.3750
1/16 0.4375
0.2500
0.3125
0.3750
0.4375		 0.2450
0.3070
0.3690
0.4310		 0.500
0.625
0.750
0.812		 0.452
0.567
0.682
0.736		 0.140
0.177
0.210
0.210		 0.075
0.084
0.094
0.094		 0.064
0.072
0.081
0.081		 .0.68
0.086
0.103
0.103		 0.045
0.057
0.068
0.068		 0.100
0.125
0.150
0.175		 0.046
0.053
0.060
0.065		 0.030
0.035
0.040
0.044		 0.424
0.538
0.651
0.703
1/2 0.5000
9/16 0.5625
5/8 0.6250
0.5000
0.5625
0.6250		 0.4930
0.5550
0.6170		 0.875
1.000
1.125		 0.791
0.906
1.020		 0.210
0.244
0.281		 0.106
0.118
0.133		 0.091
0.102
0.116		 0.103
0.120
0.137		 0.068
0.080
0.091		 0.200
0.225
0.250		 0.071
0.078
0.085		 0.049
0.054
0.058		 0.756
0.869
0.982
3/4 0.7500
7/8 0.8750
1 1.0000
0.7500
0.8750
1.0000		 0.7420
0.8660
0.9900		 1.375
1.625
1.875		 1.251
1.480
1.711		 0.352
0.423
0.494		 0.149
0.167
0.188		 0.131
0.147
0.166		 0.171
0.206
0.240		 0.115
0.138
0.162		 0.300
0.350
0.400		 0.099
0.113
0.127		 0.068
0.077
0.087		 1.208
1.435
1.661
1-1/8 1.1250
1-1/4 1.2500
1-3/8 1.3750
1-1/2 1.5000
1.1250
1.2500
1.3750
1.5000		 1.1140
1.2390
1.3630
1.4880		 2.062
2.312
2.562
2.812		 1.880
2.110
2.340
2.570		 0.529
0.600
0.665
0.742		 0.196
0.211
0.226
0.258		 0.178
0.193
0.208
0.240		 0.257
0.291
0.326
0.360		 0.173
0.197
0.220
0.244		 0.450
0.500
0.550
0.600		 0.141
0.155
0.169
0.183		 0.096
0.105
0.115
0.124		 1.826
2.052
2.279
2.505

 

Reliant Frame Bolts Grade 8
Alloy		 Reliant Frame Bolts
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Nominal
Size Or Basic Major Dia. Of Thread		 E F G B U H LT
Body Dia. Width Across Flats Width
Across
Corners		 Flange
Dia.		 Flange Thickness Head Height Thread Lngth.
L<6 In. L>6 In.
  Max. Min. Basic Max. Min. Max. Min. Max. Min. Max. Min. Basic
3/8 0.3750
1/2 0.5000
5/8 0.6250
3/4 0.7500
0.3750
0.5000
0.6250
0.7500		 0.3690
0.4930
0.6170
0.7410		 9/16
3/4
15/16
1-1/8		 0.5625
0.7500
0.9375
1.1250		 0.551
0.736
0.922
1.100		 0.650
0.866
1.083
1.299		 0.618
0.825
1.034
1.234		 0.81
1.07
1.33
1.59		 0.06
0.08
0.10
0.11		 0.39
0.51
0.62
0.73		 0.25
0.34
0.42
0.51		 1.000
1.250 1.500 1.750		 1.250
1.500
1.750
2.000

CAP SCREWS AND BOLTS

Hex Cap Screws Hex Cap Screws
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Nominal
Or Basic Product Dia.		 E F G H R LT
Body Diameter Width Across Flats Width
Across
Corners		 Head Height Radius of Fillet Thread Lngth.
For Screw Lengths < 6 In. For Screw Lengths > 6 In.
  Max. Min. Basic Max. Min. Max. Min. Basic Max. Min Min. Basic Basic
1/4 0.2500
5/16 0.3125
3/8 0.3750
7/16 0.4375
0.2500
0.3125
0.3750
0.4375		 0.2450
0.3065
0.3690
0.4305		 7/16
1/2
9/16
5/8		 0.438
0.500
0.562
0.625		 0.428
0.489
0.551
0.612		 0.505
0.577
0.650
0.722		 0.488
0.557
0.628
0.698		 5/32
13/64
15/64
9/32		 0.163
0.211
0.243
0.291		 0.150
0.195
0.226
0.272		 0.015
0.015
0.015
0.015		 0.750
0.875 1.000 1.125 		1.000
1.125
1.250
1.375
1/2 0.5000
9/16 0.5625
5/8 0.6250
3/4 0.7500
0.5000
0.5625
0.6250
0.7500		 0.4930
0.5545
0.6170
0.7410		 3/4
13/16
15/16
1-1/8		 0.750
0.812
0.938
1.125		 0.736
0.798
0.922
1.100		 0.866
0.938
1.083
1.299		 0.840
0.910
1.051
1.254		 5/16
23/64
25/64
15/32		 0.323
0.371
0.403
0.483		 0.302
0.348
0.378
0.455		 0.015
0.020
0.020
0.020		 1.250
1.375
1.500
1.750		 1.500
1.625
1.750
2.000
7/8 0.8750
1 1.0000
1-1/8 1.1250
1-1/4 1.250
0.8750
1.0000
1.1250
1.2500		 0.8660
0.9900
1.1140
1.2390		 1-5/16
1-1/2
1-11/16
1-7/8		 1.312
1.500
1.688
1.875		 1.285
1.469
1.631
1.812		 1.516
1.732
1.949
2.165		 1.465
1.675
1.859
2.066		 35/64
39/64
11/16
25/32		 0.563
0.627
0.718
0.813		 0.531
0.591
0.658
0.749		 0.040
0.060
0.060
0.060		 2.000
2.250
2.500
2.750		 2.250
2.500
2.750
3.000
1-3/8 1.3750
1-1/2 1.5000
1.3750
1.5000		 1.3630
1.4880		 2-1/6
2-1/4		 2.062
2.250		 1.994
2.175		 2.382
2.598		 2.273
2.480		 27/32
15/16		 0.878
0.974		 0.810
0.902		 0.060
0.060		 3.000
3.250		 3.250
3.500

 

Mechanical and Material
Requirements for Grades 2, 5 & 8 Hex
Head Cap Screws

Abstract of SAE J429 1985

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Grade
Designa
tion		 Products Nominal Size Dia.,
In.		 Full Size
Bolts, Screws
Studs, Sems		 Machine Test Specimens of
Bolts, Screws and Studs		 Surface
Hardness		 Core
Hardness		 Grade
Identification
Marking L
Proof
Load (Stress)
psi		 Tensile
Strength
(Stress)
Min.,psi		 Yield
Strength
(Stress)
Min.,psi		 Tensile
Strength
(Stress)
Min.,psi		 Elonga-
tion Min., %		 Reduction
of Area
Min, %		 Rockwell
30N
Max.		 Rockwell
Min. Max.
2 Bolts,
Screws, Studs		 1/4 thru 3/4
Over 3/4 to 1-1/2		 55,000


33,000		 74,000


60,000		 57,000


36,000		 74,000


60,000		 18


18		 35


35		 --


--		 B80


B70		 B100


B100


None
5 Bolts,
Screws, Studs		 1/4 thru 3/4
Over 3/4 to 1-1/2		 85,000


74,000		 120,000


105,000		 92,000


81,000		 120,000


105,000		 14


14		 35


35		 54


50		 C25


C19		 C34


C30
8 Bolts,
Screws, Studs		 1/4 thru 1-1/2 120,000 150,000 130,000 150,000 12 35 58.6 C33 C39

 

Step Bolts Step Bolts
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Nominal
Size
or Basic
Bolt Diameter		 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 0.1900
1/4 0.2500
0.199
0.260		 0.182
0.237		 0.656
0.844		 0.625
0.813		 0.114
0.145		 0.094
0.125		 0.199
0.260		 0.185
0.245		 0.125
0.156		 0.094
0.125
5/16 0.3125
3/8 0.3750
0.324
0.388		 0.298
0.360		 1.031
1.219		 1.000
1.188		 0.176
0.208		 0.156
0.188		 0.324
0.388		 0.307
0.368		 0.187
0.219		 0.156
0.188

 

Hanger Bolts
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Hanger Bolts
Size A B