MACHINE SCREWS
 HEX SLOT HEAD
All Dimensions in Inches
Screw 
Diameter
Width Across Flats Width Across
 Corners
Head Height Width of Slot Depth of Slot
Max. Min. Min. Max. Min. Max. Min. Max. Min.
4/40 .187 .181 .202 .060 .049 .039 .031 .036 .025
6/32 .250 .244 .272 .093 .080 .048 .039 .046 .033
8/32 .250 .244 .272 .110 .096 .054 .045 .066 .052
10/24 .312 .305 .340 .120 .105 .060 .050 .072 .057
10/32 .312 .305 .340 .120 .105 .060 .050 .072 .057
1/4-20 .375 .367 .409 .190 .172 .075 .064 .101 .083