Hex Heads

Nominal Size A W H F U J T
Width Across
Flats
Width Across Corners Height of Head Diameter of Washer Thickness of Washer Width of Slot Depth of Slot
Max Min Min Max Min Max Min Max Min Max Min Max Min
2 .125 .120 .134 .050 .040 .166 .154 .016 .010 - - - -
4 .188 .181 .202 .060 .049 .243 .225 .019 .011 .039 .031 .042 .025
5 .188 .181 .202 .070 .058 .260 .240 .025 .015 .043 .035 .049 .030
6 .250 .244 .272 .093 .080 .328 .302 .025 .015 .048 .039 .053 .033
8 .250 .244 .272 .110 .096 .348 .322 .031 .019 .054 .045 .074 .052
10 .312 .305 .340 .120 .105 .414 .384 .031 .019 .060 .050 .080 .057
12 .312 .305 .340 .155 .139 .432 .398 .039 .022 .067 .056 .103 .077
1/4 .375 .367 .409 .190 .172 .520 .480 .050 .030 .075 .064 .111 .083
5/16 .500 .489 .545 .230 .208 .676 .624 .055 .035 .084 .072 .134 .100
3/8 .562 .551 .614 .295 .270 .780 .720 .063 .037 .094 .081 .168 .131
1/2 .750 .735 .820 .400 .367 1.040 .960 .085 .050 - - - -