Dimensions of ASME B18.2.1 Hex Bolts
|
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Thread Length for
Body Bolt Lengths, LT See Para. 3.7) |
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Nominal Size
or Basic Product Diameter |
Full-Size Body Diameter,E
(See Paras. 3.4 and 3.5) |
Width Across Flats, F (See Para. 2.1.2)
|
Width Across Corners, G
|
Head Height, H
|
Radius of Fillet, R
|
6 in. and Shorter
|
Over 6 in.
|
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Max.
|
Min.
|
Basic
|
Max.
|
Min.
|
Max.
|
Min.
|
Basic
|
Max.
|
Min.
|
Max.
|
Min.
|
Nom.
|
Nom.
|
||
1/4
|
0.25
|
0.26
|
0.237
|
7/16
|
0.438
|
0.425
|
0.505
|
0.484
|
11/64
|
0.188
|
0.15
|
0.03
|
0.01
|
0.75
|
1
|
5/16
|
0.3125
|
0.324
|
0.298
|
1/2
|
0.5
|
0.484
|
0.577
|
0.552
|
7/32
|
0.235
|
0.195
|
0.03
|
0.01
|
0.875
|
1.125
|
3/8
|
0.375
|
0.388
|
0.36
|
9/16
|
0.562
|
0.544
|
0.65
|
0.62
|
1/4
|
0.268
|
0.226
|
0.03
|
0.01
|
1
|
1.25
|
7/16
|
0.4375
|
0.452
|
0.421
|
5/8
|
0.625
|
0.603
|
0.722
|
0.687
|
19/64
|
0.316
|
0.272
|
0.03
|
0.01
|
1.125
|
1.375
|
1/2
|
0.5
|
0.515
|
0.482
|
3/4
|
0.75
|
0.725
|
0.866
|
0.826
|
11/32
|
0.364
|
0.302
|
0.03
|
0.01
|
1.25
|
1.5
|
5/8
|
0.625
|
0.642
|
0.605
|
15/16
|
0.938
|
0.906
|
1.083
|
1.033
|
27/64
|
0.444
|
0.378
|
0.06
|
0.02
|
1.5
|
1.75
|
3/4
|
0.75
|
0.768
|
0.729
|
1 1/8
|
1.125
|
1.088
|
1.299
|
1.24
|
1/2
|
0.524
|
0.455
|
0.06
|
0.02
|
1.75
|
2
|
7/8
|
0.875
|
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
|
2.25
|
1
|
1
|
1.022
|
0.976
|
1 1/?2
|
1.5
|
1.45
|
1.732
|
1.653
|
43/64
|
0.7
|
0.591
|
0.09
|
0.03
|
2.25
|
2.5
|
1 1/8
|
1.125
|
1.149
|
1.098
|
1 11/16
|
1.688
|
1.631
|
1.949
|
1.859
|
3/4
|
0.78
|
0.658
|
0.09
|
0.03
|
2.5
|
2.75
|
1 1/4
|
1.25
|
1.277
|
1.223
|
1 7/8
|
1.875
|
1.812
|
2.165
|
2.066
|
27/32
|
0.876
|
0.749
|
0.09
|
0.03
|
2.75
|
3
|
1 3/8
|
1.375
|
1.404
|
1.345
|
2 1/16
|
2.062
|
1.994
|
2.382
|
2.273
|
29/32
|
0.94
|
0.81
|
0.09
|
0.03
|
3
|
3.25
|
1 1/2
|
1.5
|
1.531
|
1.47
|
2 1/4
|
2.25
|
2.175
|
2.598
|
2.48
|
1
|
1.036
|
0.902
|
0.09
|
0.03
|
3.25
|
3.5
|
1 5/8
|
1.625
|
1.658
|
1.591
|
2 7/16
|
2.438
|
2.356
|
2.815
|
2.616
|
1 3/32
|
1.116
|
0.978
|
0.09
|
0.03
|
3.5
|
3.75
|
1 3/4
|
1.75
|
1.785
|
1.716
|
2 5/8
|
2.625
|
2.538
|
3.031
|
2.893
|
1 5/32
|
1.196
|
1.054
|
0.12
|
0.04
|
3.75
|
4
|
1 7/8
|
1.875
|
1.912
|
1.839
|
2 13/16
|
2.812
|
2.719
|
3.248
|
3.099
|
1 1/4
|
1.276
|
1.13
|
0.12
|
0.04
|
4
|
4.25
|
2
|
2
|
2.039
|
1.964
|
3
|
3
|
2.9
|
3.464
|
3.306
|
1 11/32
|
1.388
|
1.175
|
0.12
|
0.04
|
4.25
|
4.5
|
2 1/4
|
2.25
|
2.305
|
2.214
|
3 3/8
|
3.375
|
3.262
|
3.897
|
3.719
|
1 1/2
|
1.548
|
1.327
|
0.19
|
0.06
|
4.75
|
5
|
2 1/2
|
2.5
|
2.559
|
2.461
|
3 3/4
|
3.75
|
3.625
|
4.33
|
4.133
|
1 21/32
|
1.708
|
1.479
|
0.19
|
0.06
|
5.25
|
5.5
|
2 3/4
|
2.75
|
2.827
|
2.711
|
4 1/8
|
4.125
|
3.988
|
4.763
|
4.546
|
1 13/16
|
1.869
|
1.632
|
0.19
|
0.06
|
5.75
|
6
|
3
|
3
|
3.081
|
2.961
|
4 1/2
|
4.5
|
4.35
|
5.196
|
4.959
|
2
|
2.06
|
1.815
|
0.19
|
0.06
|
6.25
|
6.5
|
3 1/4
|
3.25
|
3.335
|
3.21
|
4 7/8
|
4.875
|
4.712
|
5.629
|
5.372
|
2 3/16
|
2.251
|
1.936
|
0.19
|
0.06
|
6.75
|
7
|
3 1/?2
|
3.5
|
3.589
|
3.461
|
5 1/4
|
5.25
|
5.075
|
6.062
|
5.786
|
2 5/16
|
2.38
|
2.057
|
0.19
|
0.06
|
7.25
|
7.5
|
3 3/4
|
3.75
|
3.858
|
3.726
|
5 5/8
|
5.625
|
5.437
|
6.495
|
6.198
|
2 1/2
|
2.572
|
2.241
|
0.19
|
0.06
|
7.75
|
8
|
4
|
4
|
4.111
|
3.975
|
6
|
6
|
5.8
|
6.928
|
6.612
|
2 11/16
|
2.764
|
2.424
|
0.19
|
0.06
|
8.25
|
8.5
|
Tags: ASME B18.2.1 Hex Bolts Heavy Hex Bolts
General Material:Stainless Steel,Nickel Alloy,Silicon Bronze,Aluminium Bronze,Brass,Naval Brass,Coppe,Copper-Nickel,Aluminum Alloy,Titanium,Alloy Steel,Such as C1008,C1018,C1022,C1035,C1045,40cr,SCM435,35crmoA,42crmoA,AISI4140SS304/A2-70,SS316/A4-80,SS310s,SS309,SS321,SS410,SS317,SS904L,17-4 PH/630,Duplex 2205,Duplex 31803,Nitronic 40,Nitronic 50,Nitronic 60,Nickel Alloy,Hastelloy C276,Inconel 600,Inconel 601,Inconel 625,Inconel 718,Inconel X750,Inconel 800H,Inconel 825,Monel 400,Monel 405,Monel K-500,MP35N,Nickel 200,Nickel 201,Waspaloy)C65500,C64200,C61400,C63000,C63200,C46200,H59,H62,H67,C46400,C11000,90/10 C70600,70/30 C71500,6061-T6,2024-T4,Ti-6Al-4V Grade 5,ASTM B348 Grade 2,ASTM B348 Grade 7,651/S63198
General Surface Finish:Blackoxide,Zinc,Dacromet 500/Dacromet 320,Non-electrolytically Deposited Zinc Flake,Hot-dip Galvanization,Phosphating,Passviation
General Surface Finish:Blackoxide,Zinc,Dacromet 500/Dacromet 320,Non-electrolytically Deposited Zinc Flake,Hot-dip Galvanization,Phosphating,Passviation