Dimensions of Hex Head Cap Screws - N.C. / Coarse Thread

Hex Cap Screws         Hex Cap Screws 

Hex Head Cap Screws
Nominal 
or Basic Product Diameter
E F G H
Body Diameter Width Across Flats
(Wrench Size)
Width Across Corners Head Height Thread Length
Screw L
= 6" or Shorter
 Screw L
= 6" or Greater
Max Min Nom Max Min Max Min Nom Max Min Ref Ref
1/4 .02500 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 0.4.75 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 1.375
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 0.990 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 0.789 2.750 3.000
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