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Hex Cap Screws

ASME B 18.2.1 - 1996

Display drawing:

Screw Thread 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8 1 1-1/8 1-1/4 1-3/8 1-1/2 1-3/4 2 2-1/4 1-1/2 2-3/4 3
Nominal Diameter 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4 7/8 1 1-1/8 1-1/4 1-3/8 1-1/2 1-3/4 2 2-1/4 1-1/2 2-3/4 3
D 0.25 0.3125 0.375 0.4375 0.5 0.5625 0.625 0.75 0.875 1 1.125 1.25 1.375 1.5 1.75 2 2.25 1.5 2.75 3
P 20 18 16 14 13 12 11 10 9 8 7 7 6 6 5 4.5 4.5 4 4 4
Ds Max 0.25 0.3125 0.375 0.4375 0.5 0.5625 0.625 0.75 0.875 1 1.125 1.25 1.375 1.5 1.75 2 2.25 2.5 2.75 3
Ds Min 0.245 0.3065 0.369 0.4305 0.493 0.5545 0.617 0.741 0.866 0.99 1.114 1.239 1.363 1.488 1.738 1.988 2.238 2.488 2.738 2.988
S Nominal 7/16 1/2 9/16 5/8 3/4 13/16 15/16 1-1/8 1-5/16 1-1/2 1-11/16 1-7/8 2-1/16 2-1/4 2-5/8 3 3-3/8 3-3/4 4-1/8 4-1/2
S Max 0.438 0.5 0.562 0.625 0.75 0.812 0.938 1.125 1.312 1.5 1.688 1.875 2.062 2.25 2.625 3 3.375 3.75 4.125 4.5
S Min 0.428 0.489 0.551 0.612 0.736 0.798 0.922 1.1 1.285 1.469 1.631 1.812 1.994 2.175 2.538 2.9 3.262 3.625 3.988 4.35
E Max 0.505 0.577 0.65 0.722 0.866 0.938 1.083 1.299 1.516 1.732 1.949 2.165 2.382 2.598 3.031 3.464 3.897 4.33 4.763 5.196
E Min 0.488 0.557 0.628 0.698 0.84 0.91 1.051 1.254 1.465 1.675 1.859 2.066 2.273 2.48 2.893 3.306 3.719 4.133 4.546 4.959
K Nominal 5/32 13/64 15/64 9/32 5/16 23/64 25/64 15/32 35/64 39/64 11/16 25/32 27/32 15/16 1-3/32 1-7/32 1-3/8 1-17/32 1-11/16 1-7/8
K Max 0.163 0.211 0.243 0.291 0.323 0.371 0.403 0.483 0.563 0.627 0.718 0.813 0.878 0.974 1.134 1.263 1.423 1.583 1.744 1.935
K Min 0.15 0.195 0.226 0.272 0.302 0.348 0.378 0.455 0.531 0.591 0.658 0.749 0.81 0.902 1.054 1.175 1.327 1.479 1.632 1.815
Kw Min 0.106 0.14 0.16 0.195 0.215 0.25 0.269 0.324 0.378 0.416 0.461 0.53 0.569 0.64 0.748 0.825 0.933 1.042 1.151 1.29
B L≤6 0.75 0.875 1 1.125 1.25 1.375 1.5 1.75 2 2.25 2.5 2.75 3 3.25 3.75 4.25 None None None None
B L＞6 1 1.125 1.25 1.375 1.5 1.625 1.75 2 2.25 2.5 2.75 3 3.25 3.5 4 4.5 5 5.5 6 6.5
R Max 0.025 0.025 0.025 0.025 0.025 0.450 0.450 0.450 0.065 0.095 0.095 0.095 0.095 0.095 0.095 0.095 0.095 0.095 0.095 0.095
R Min 0.015 0.015 0.015 0.015 0.015 0.020 0.020 0.020 0.040 0.060 0.060 0.060 0.060 0.060 0.060 0.060 0.060 0.060 0.060 0.060