MACHINE SCREWS
INDENTED HEX SLOT HEAD
HEAD DIMENSIONS

All Dimensions in Inches
Basic
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
5/40 .187 .181 .202 .070 .058 .045 .035 .042 .030
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
12/24 .312 .305 .340 .155 .139 .067 .056 .093 .077
1/4 .375 .367 .409 .190 .172 .075 .064 .101 .083
5/16 .500 .488 .545 .230 .208 .084 .072 .122 .100
3/8 .562 .551 .614 .295 .270 .094 .081 .156 .131