Cap Screws

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 BoltsRound 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
EBody
Diameter
A HHead
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 orBasic 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, EdgeSharp 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 C D
Standard
Length
Machine
Length
Lag
Thread Length
Center
Space
10-24 x1-1/2
x1-3/4
x2
x2-1/2
x3
1-1/2
1-3/4
2
2-1/2
3
5/8
3/4
1
1
1-1/2
7/8
1
1
1-1/2
1-1/2
1/4-20 x1-1/2
x1-3/4
x2
x2-1/4
x2-1/2
x3
x3-1/2
x4
x4-1/2
x5
x6
1-1/2
1-3/4
2
2-1/4
2-1/2
3
3-1/2
4
4-1/2
5
6
1/2
3/4
1
1
1
1-1/2
1-1/2
2
1-1/8
1-1/8
1-1/4
3/4
1
1
1-1/4
1-1/2
1-1/2
2
2
3
3
3
3/8
7/8
1-3/4
5/16-18 x1-1/2
x1-3/4
x2
x2-1/4
x2-1/2
x2-3/4
x3
x3-1/2
x4
x4-1/2
x5
x5-1/2
x6
1-1/2
1-3/4
2
2-1/4
2-1/2
2-3/4
3
3-1/2
4
4-1/2
5
5-1/2
6
5/8
3/4
1
1
1
1-1/4
1-1/2
1-1/2
2
1-1/8
1-1/8
1-1/8
1-1/4
7/8
1
1
1-1/4
1-1/2
1-1/2
1-1/2
2
2
2
3
3
3
7/8
7/8
1-3/8
1-3/4
3/8-16 x2
x2-1/2
x3
x3-1/2
x4
x4-1/2
x5
x5-1/2
x6
x8
x10
2
2-1/2
3
3-1/2
4
4-1/2
5
5-1/2
6
8
10
1
1
1-1/2
1-1/2
2
1-1/8
1-1/8
1-1/8
1-1/4
2-1/2
2-1/2
1
1-1/2
1-1/2
2
2
3
3
3
3
3
3
3/8
3/8
1-3/8
1-3/8
2-1/2
4-1/2
Hanger Bolt

 

Serrated Flange Screws

Whiz-Lock® Equivalents

®Whiz-Lock is a registered trademark of the MacLean-Fogg Co.

Size W F
Width Across
Flats
Flange
Data
6
8
10
1/4
5/16
3/8
.187
.250
.312
.375
.500
.562
.260
.348
.433
.522
.696
.782