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Hex Cap Screws

ASME B 18.2.1 - 1996

Display drawing:

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