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ASME B18.2.1 Hex Cap Screws
Dimensions of Hex Cap Screws |
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Thread Length for Screw Leng ths, LT (See Para. 4.7) |
Transition Thread
Leng th, Y See Para. 4.7) |
Maximum Total Runout of Bearing Surface FIM (See Para. 4.4) |
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Nominal Size or Basic Product Diameter |
Body Diameter, E (See Para. 4.6) |
Width Across Flats, F (See Para. 2.1.2) |
Width Across Corners, G |
Head Height, H |
Minimum Wrenching Height, |
6 in. and Shorter |
Over 6 in. |
Reference |
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Max. |
Min. |
Basic |
Max. |
Min. |
Max. |
Min. |
Basic |
Max. |
Min. |
|||||||
1/4 |
0.25 |
0.25 |
0.245 |
7/16 |
0.438 |
0.428 |
0.505 |
0.488 |
5/32 |
0.163 |
0.15 |
0.106 |
0.75 |
1 |
0.25 |
0.01 |
5/16 |
0.313 |
0.3125 |
0.3065 |
1/2 |
0.5 |
0.489 |
0.577 |
0.557 |
13/64 |
0.211 |
0.195 |
0.14 |
0.875 |
1.125 |
0.278 |
0.011 |
3/8 |
0.375 |
0.375 |
0.369 |
9/16 |
0.562 |
0.551 |
0.65 |
0.628 |
15/64 |
0.243 |
0.226 |
0.16 |
1 |
1.25 |
0.312 |
0.012 |
7/16 |
0.438 |
0.4375 |
0.4305 |
5/8 |
0.625 |
0.612 |
0.722 |
0.698 |
9/32 |
0.291 |
0.272 |
0.195 |
1.125 |
1.375 |
0.357 |
0.013 |
1/2 |
0.5 |
0.5 |
0.493 |
3/4 |
0.75 |
0.736 |
0.866 |
0.84 |
5/16 |
0.323 |
0.302 |
0.215 |
1.25 |
1.5 |
0.385 |
0.014 |
9/16 |
0.563 |
0.5625 |
0.5545 |
13/16 |
0.812 |
0.798 |
0.938 |
0.91 |
23/64 |
0.371 |
0.348 |
0.25 |
1.375 |
1.625 |
0.417 |
0.015 |
5/8 |
0.625 |
0.625 |
0.617 |
15/16 |
0.938 |
0.922 |
1.083 |
1.051 |
25/64 |
0.403 |
0.378 |
0.269 |
1.5 |
1.75 |
0.455 |
0.017 |
3/4 |
0.75 |
0.75 |
0.741 |
1 1/8 |
1.125 |
1.1 |
1.299 |
1.254 |
15/32 |
0.483 |
0.455 |
0.324 |
1.75 |
2 |
0.5 |
0.02 |
7/8 |
0.875 |
0.875 |
0.866 |
1 5/16 |
1.312 |
1.285 |
1.516 |
1.465 |
35/64 |
0.563 |
0.531 |
0.378 |
2 |
2.25 |
0.556 |
0.023 |
1 |
1 |
1 |
0.99 |
1 1/2 |
1.5 |
1.469 |
1.732 |
1.675 |
39/64 |
0.627 |
0.591 |
0.416 |
2.25 |
2.5 |
0.625 |
0.026 |
1 1/8 |
1.125 |
1.125 |
1.114 |
1 11/16 |
1.688 |
1.631 |
1.949 |
1.859 |
11/16 |
0.718 |
0.658 |
0.461 |
2.5 |
2.75 |
0.714 |
0.029 |
1 1/4 |
1.25 |
1.25 |
1.239 |
1 7/8 |
1.875 |
1.812 |
2.165 |
2.066 |
25/32 |
0.813 |
0.749 |
0.53 |
2.75 |
3 |
0.714 |
0.033 |
1 3/8 |
1.375 |
1.375 |
1.363 |
2 1/16 |
2.062 |
1.994 |
2.382 |
2.273 |
27/32 |
0.878 |
0.81 |
0.569 |
3 |
3.25 |
0.833 |
0.036 |
1 1/2 |
1.5 |
1.5 |
1.488 |
2 1/4 |
2.25 |
2.175 |
2.598 |
2.48 |
15/16 |
0.974 |
0.902 |
0.64 |
3.25 |
3.5 |
0.833 |
0.039 |
1 5/8 |
1.625 |
1.625 |
1.613 |
2 7/16 |
2.438 |
2.356 |
2.815 |
2.686 |
1 |
1.038 |
0.962 |
0.694 |
3.5 |
3.75 |
0.909 |
0.043 |
1 3/4 |
1.75 |
1.75 |
1.738 |
2 5/8 |
2.625 |
2.538 |
3.031 |
2.893 |
1 3/32 |
1.134 |
1.054 |
0.748 |
3.75 |
4 |
1 |
0.046 |
1 7/8 |
1.875 |
1.875 |
1.863 |
2 13/16 |
2.812 |
2.719 |
3.248 |
3.099 |
1 5/32 |
1.198 |
1.114 |
0.802 |
4 |
4.25 |
1 |
0.049 |
2 |
2 |
2 |
1.988 |
3 |
3 |
2.9 |
3.464 |
3.306 |
1 7/32 |
1.263 |
1.175 |
0.825 |
4.25 |
4.5 |
1.111 |
0.052 |
2 1/4 |
2.25 |
2.25 |
2.238 |
3 3/8 |
3.375 |
3.262 |
3.897 |
3.719 |
1 3/8 |
1.423 |
1.327 |
0.933 |
… |
5 |
1.111 |
0.059 |
2 1/2 |
2.5 |
2.5 |
2.488 |
3 3/4 |
3.75 |
3.625 |
4.33 |
4.133 |
1 17/32 |
1.583 |
1.479 |
1.042 |
… |
5.5 |
1.25 |
0.065 |
2 3/4 |
2.75 |
2.75 |
2.738 |
4 1/8 |
4.125 |
3.988 |
4.763 |
4.546 |
1 11/16 |
1.744 |
1.632 |
1.151 |
… |
6 |
1.25 |
0.072 |
3 |
3 |
3 |
2.988 |
4 1/2 |
4.5 |
4.35 |
5.196 |
4.959 |
1 7/8 |
1.935 |
1.815 |
1.29 |
… |
6.5 |
1.25 |
0.079 |
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