THREAD ROLLING SCREWS
INDENTED HEX WASHER HEAD
All Dimensions in Inches
Screw 
Diameter
Width Across 
Flats
Width 
Across 
Corners
Head 
Height
Washer
Diameter 
Washer
Thickness 
Max. Min. Min. Max. Min. Max. Min. Max. Min.
4/40 .187 .181 .202 .060 .049 .243 .225 .019 .011
6/32 .250 .244 .272 .093 .080 .328 .302 .0.25 .015
8/32 .250 .244 .272 .110 .096 .348 .322 .031 .019
10/24 .312 .305 .340 .120 .105 .414 .384 .031 .019
10/32 .312 .305 .340 .120 .105 .414 .384 .031 .019
12/24 .312 .305 .340 .155 .139 .432 .398 .039 .022
1/4-20 .375 .367 .409 .190 .172 .520 .480 .050 .030
5/16-16 .500 .489 .545 .230 .208 .676 .624 .055 .035
3/8-18 .562 .551 .614 .295 .270 .780 .720 .063 .037