MACHINE SCREWS
FLAT HEAD SLOT
 HEAD DIMENSIONS ONLY

All Dimensions In Inches

Basic
Screw
Diameter

 Head Diameter Head Height Slot Width Slot Depth
Max. Min. Max. Min. Max. Min. Max. Min.
2/56 .172 .150 .051 .040 .031 .023 .023 .015
3/48 .199 .175 .059 .048 .035 .027 .027 .017
4/40 .225 .200 .067 .055 .039 .031 .030 .020
5/40 .252 .225 .075 .062 .043 .035 .034 .022
6/32 .279 .249 .083 .069 .048 .039 .038 .024
8/32 .332 .300 .100 .084 .054 .045 .045 .029
10/24 .385 .348 .116 .098 .060 .050 .053 .034
10//32 .385 .348 .116 .098 .060 .050 .053 .034
12/24 .438 .397 .132 .112 .067 .056 .060 .039
1/4 .507 .462 .153 .131 .075 .064 .070 .046
5/16 .635 .581 .191 .165 .084 .072 .088 .058
3/8 .762 .700 .230 .200 .094 .081 106 .070