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ASTM A193 Bolts Specification
ASTM A193 Heavy Hex bolts
ASTM A193M Metric Heavy Hex Bolts
ASTM A193M Metric Heavy Hex Screws
Dimensions of ASME B18.2.1 Heavy Hex Screws
Nominal Size or Basic product Diameter
Body Diameter, E
Width Across Flats, F
Width Across Corners, G
Head Height, H
Minimum Wrenching Height, J
Thread Length for Screws Lengths, LT
Transition Thread Length, Y
Maximum Total Runout of Bearing Surface FIM
6 in. & Shorter
Over 6 in.
Max.
Min.
Nom.
3/8
0.3750
0.360
0.688
0.669
0.794
0.763
0.243
0.226
0.160
1.000
1.250
0.312
0.014
1/2
0.5000
0.482
0.875
0.850
1.010
0.969
0.323
0.302
0.215
1.500
0.385
0.016
5/8
0.6250
0.605
1.062
1.031
1.227
1.175
0.403
0.378
0.269
1.750
0.455
0.019
3/4
0.7500
0.729
1.212
1.443
1.383
0.483
0.324
2.000
0.500
0.022
7/8
0.8750
0.852
1.438
1.394
1.660
1.589
0.563
0.531
2.250
0.556
0.025
1
1.0000
0.976
1.625
1.575
1.876
1.796
0.627
0.591
0.416
2.500
0.625
0.028
1 1/8
1.1250
1.098
1.812
1.756
2.093
2.002
0.718
0.658
0.461
2.750
0.714
0.032
1 1/4
1.2500
1.223
1.938
2.309
2.209
0.813
0.749
0.530
3.000
0.035
1 3/8
1.3750
1.345
2.188
2.119
2.526
2.416
0.878
0.810
0.569
3.250
0.833
0.038
1 1/2
1.5000
1.470
2.375
2.300
2.742
2.622
0.974
0.902
0.640
3.500
0.041
1 5/8
1.6250
1.591
2.562
2.481
2.959
2.829
1.038
0.962
0.694
3.750
0.909
0.044
1 3/4
1.7500
1.716
2.662
3.175
3.035
1.134
1.054
0.748
4.000
0.048
1 7/8
1.8750
1.839
2.938
2.844
3.392
3.242
1.198
1.114
0.802
4.250
0.052
2
1.964
3.125
3.025
3.608
3.449
1.263
0.825
4.500
1.111
0.055
2 1/4
2.2500
2.214
3.388
4.041
3.862
1.423
1.327
0.933
--
5.000
0.061
2 1/2
2.5000
2.4610
3.8750
4.474
4.275
1.583
1.479
1.042
5.500
0.068
2 3/4
2.7500
2.7110
4.2500
4.112
4.907
4.688
1.744
1.632
1.151
6.000
0.074
3
2.9610
4.6250
4.475
5.340
5.102
1.935
1.815
1.290
6.500
0.081
3 1/4
3.2500
3.2100
5.0000
4.838
5.774
5.515
2.126
1.998
1.399
7.000
3 1/2
3.5000
3.4610
5.3750
5.200
6.207
5.928
2.256
2.120
1.484
7.500
0.098
3 3/4
3.7500
3.7109
5.7500
5.562
6.640
6.341
2.447
2.303
1.612
8.000
0.105
4
4.0000
3.9609
6.1250
5.925
7.073
6.755
2.576
2.424
1.697
8.500
0.112
4 1/4
4.2228
6.5000
6.288
7.506
7.168
2.768
2.608
1.826
9.000
0.119
4 1/2
4.5000
4.4727
6.8750
6.650
7.939
7.581
2.896
2.728
1.910
9.500
0.126
4 3/4
4.7500
4.7227
7.2500
7.012
8.372
7.994
3.088
2.912
2.038
10.000
0.133
5
4.9726
7.6250
7.375
8.805
8.408
3.217
3.033
2.123
10.500
0.14
5 1/4
5.2500
5.2226
8.0000
7.738
9.238
8.821
3.408
3.216
2.251
11.000
0.147
5 1/2
5.5000
5.4726
8.3750
8.100
9.671
9.234
3.538
3.338
2.337
11.500
0.154
5 3/4
5.7225
8.7500
8.462
10.104
9.647
3.729
3.521
2.465
12.000
0.161
6
6.0000
5.9725
9.1250
8.825
10.537
10.060
3.858
3.642
2.549
12.500
0.168
Note: Wrenching Height J, is a distance measured from the bearing surface up the side of the head at the corners. The width across corner shall be within specified limits for the full wrenching height.
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