Flat Heads

Nominal Size A H J T M R N F G Phillips Driver Size
Head Dimensions Slot Dimensions Recess Dimensions Protrusion Above
Gaging Diameter		 Gaging Diameter
Diameter Height Width Depth Diam. Depth Width
Max Min Max Min Max Min Max Min Ref Ref Ref Max Min
0 .112 .096 .035 .026 .023 .016 .015 .010 .062 .035 .014 .026 .016 .078 0
1 .137 .120 .043 .033 .026 .019 .019 .012 .070 .043 .015 .028 .016 .101 0
2 .162 .144 .051 .040 .031 .023 .023 .015 .096 .055 .017 .029 .017 .124 1
3 .187 .167 .059 .047 .035 .027 .027 .017 .100 .060 .018 .031 .018 .148 1
4 .212 .191 .067 .055 .039 .031 .030 .020 .122 .081 .018 .032 .019 .172 1
5 .237 .215 .075 .062 .043 .035 .034 .022 .148 .074 .027 .034 .020 .196 2
6 .262 .238 .083 .069 .048 .039 .038 .024 .168 .094 .029 .036 .021 .220 2
8 .312 .285 .100 .084 .054 .045 .045 .029 .182 .110 .030 .039 .023 .267 2
10 .362 .333 .116 .098 .060 .050 .053 .034 .198 .124 .032 .042 .025 .313 2
12 .412 .380 .132 .112 .067 .056 .060 .039 .262 .144 .035 .045 .027 .362 3
1/4 .477 .442 .153 .131 .075 .064 .070 .046 .276 .160 .036 .050 .029 .424 3
5/16 .597 .556 .191 .165 .084 .072 .088 .058 .358 .205 .061 .057 .034 .539 4
3/8 .717 .670 .230 .200 .094 .081 .106 .070 .386 .234 .065 .065 .039 .653 4
1/2 .815 .765 .223 .186 .106 .091 .103 .065 .418 .265 .069 .081 .049 .739 4