ASME B18.2.1 Square Head Bolts




Dimensions of Square Head Bolts
 
Thread Length for
Bolt Leng ths, LT
(See Para. 3.7)
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.
Max.
Min.
Basic
Max.
Min.
Max.
Min.
Basic
Max.
Min.
Max.
Min.
Nom.
Nom.
1/4
0.25
0.26
0.237
3/8
0.375
0.362
0.53
0.498
11/64
0.188
0.156
0.03
0.01
0.75
1
5/16
0.3125
0.324
0.298
1/2
0.5
0.484
0.707
0.665
13/64
0.22
0.186
0.03
0.01
0.875
1.125
3/8
0.375
0.388
0.36
9/16
0.562
0.544
0.795
0.747
1/4
0.268
0.232
0.03
0.01
1
1.25
7/16
0.4375
0.452
0.421
5/8
0.625
0.603
0.884
0.828
19/64
0.316
0.278
0.03
0.01
1.125
1.375
1/2
0.5
0.515
0.482
3/4
0.75
0.725
1.061
0.995
21/64
0.348
0.308
0.03
0.01
1.25
1.5
5/8
0.625
0.642
0.605
1 5/16
0.938
0.906
1.326
1.244
27/64
0.444
0.4
0.06
0.02
1.5
1.75
3/4
0.75
0.768
0.729
1 1/8
1.125
1.088
1.591
1.494
1/2
0.524
0.476
0.06
0.02
1.75
2
7/8
0.875
0.895
0.852
1 5/16
1.312
1.269
1.856
1.742
19/32
0.62
0.568
0.06
0.02
2
2.25
1
1
1.022
0.976
1 1/2
1.5
1.45
2.121
1.991
21/32
0.684
0.628
0.09
0.03
2.25
2.5
1 1/8
1.125
1.149
1.098
1 11/16
1.688
1.631
2.386
2.239
3/4
0.78
0.72
0.09
0.03
2.5
2.75
1 1/4
1.25
1.277
1.223
1 7/8
1.875
1.812
2.652
2.489
27/32
0.876
0.812
0.09
0.03
2.75
3
1 3/8
1.375
1.404
1.345
2 1/16
2.062
1.994
2.917
2.738
29/32
0.94
0.872
0.09
0.03
3
3.25
1 1/2
1.5
1.531
1.47
2 1/4
2.25
2.175
3.182
2.986
1
1.036
0.964
0.09
0.03
3.25
3.5

Tags: Square Head Bolts, ASME B18.2.1

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