HEX CAP SCREWS
HEAD DIMENSIONS
All Dimensions in Inches
Nominal Size or Basic Product Diameter Body Diameter Width Across Flats Width Across Corners Height Thread Length
Under 6 in. Over 6 in.
Max. Min. Basic Max. Min. Max. Min. Basic Max. Min. Basic Basic
1/4 0.2500 0.2500 0.2450 7/16 0.438 0.428 0.505 0.488 5/32 0.163 0.150 0.750 1.000
5/16 0.3125 0.3125 0.3065 1/2 0.500 0.489 0.577 0.557 13/64 0.211 0.195 0.875 1.125
3/8 0.3750 0.3750 0.3690 9/16 0.562 0.551 0.650 0.628 15/64 0.243 0.226 1.000 1.250
7/16 0.4375 0.4375 0.4305 5/8 0.625 0.612 0.722 0.698 9/32 0.291 0.272 1.125 1.375
1/2 0.5000 0.5000 0.4930 3/4 0.750 0.736 0.866 0.840 5/16 0.323 0.302 1.250 1.500
9/16 0.5625 0.5625 0.5545 13/16 0.812 0.798 0.938 0.910 23/64 0.371 0.348 1.375 1.625
5/8 0.6250 0.6250 0.6170 15/16 0.938 0.922 1.083 1.051 25/64 0.403 0.378 1.500 1.750
3/4 0.7500 0.7500 0.7410 1-1/8 1.125 1.100 1.299 1.254 15/32 0.483 0.455 1.750 2.000
7/8 0.8750 0.8750 0.8660 1-5/16 1.312 1.285 1.516 1.465 35/64 0.563 0.531 2.000 2.250
1 1.0000 1.0000 0.9900 1-1/2 1.500 1.469 1.732 1.675 39/64 0.627 0.591 2.250 2.500
1-1/8 1.1250 1.1250 1.1140 1-11/16 1.688 1.631 1.949 1.859 11/16 0.718 0.658 2.500 2.750
1-1/4 1.2500 1.2500 1.2390 1-7/8 1.875 1.812 2.165 2.066 25/32 0.813 0.749 2.750 3.000
1-3/8 1.3750 1.3750 1.3630 2-1/16 2.062 1.994 2.382 2.273 27/32 0.878 0.810 3.000 3.250
1-1/2 1.5000 1.5000 1.4880 2-1/4 2.250 2.175 2.598 2.480 1-5/16 0.974 0.902 3.250 3.500
1-3/4 1.7500 1.7500 1.7380 2-5/8 2.625 2.538 3.031 2.893 1-3/32 1.134 1.054 3.750 4.000
2 2.0000 2.0000 1.9880 3 3.000 2.900 3.464 3.306 1-7/32 1.263 1.175 4.250 4.500
2-1/4 2.2500 2.2500 2.2380 3-3/8 3.375 3.262 3.897 3.719 1-3/8 1.423 1.327 4.750 5.000
2-1/2 2.5000 2.5000 1.4880 3-3/4 3.750 3.625 4.330 4.133 1-17/32 1.583 1.479 5.250 5.500
2-3/4 2.7500 2.7500 2.7380 4-1/8 4.125 3.988 4.763 4.546 1-11/16 1.744 1.632 5.750 6.000
3 3.0000 3.0000 2.9880 4-1/2 4.500 4.350 5.196 4.959 1-7/8 1.935 1.815 6.250 6.500