Undercut Flat Heads

Nominal Size L A H J T M R N F G Phillips Driver Size
These Lengths or Shorter are Undercut 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 1/8 .112 .096 .025 .018 .023 .016 .011 .007 .062 .035 .014 - - - 0
1 1/8 .137 .120 .031 .023 .026 .019 .014 .009 .070 .043 .015 - - - 0
2 1/8 .162 .144 .036 .028 .031 .023 .016 .011 .088 .048 .017 .029 .017 .124 1
4 3/16 .212 .191 .047 .038 .039 .031 .022 .014 .110 .070 .018 .032 .019 .172 1
5 3/16 .237 .215 .053 .043 .043 .035 .024 .016 .122 .081 .018 .034 .020 .196 1
6 3/16 .262 .238 .059 .048 .048 .039 .027 .017 .140 .066 .025 .036 .021 .220 2
8 1/4 .312 .285 .070 .058 .054 .045 .032 .021 .168 .094 .029 .039 .023 .267 2
10 5/16 .362 .333 .081 .068 .060 .050 .037 .024 .182 .110 .030 .042 .025 .313 2
12 3/8 .412 .380 .092 .078 .067 .056 .043 .028 .226 .110 .030 .045 .027 .362 3
1/4 7/16 .477 .442 .107 .092 .075 .064 .050 .032 .244 .124 .032 .050 .029 .424 3
5/16 1/2 .597 .556 .134 .116 .084 .072 .062 .041 .310 .157 .053 .057 .034 .539 4
3/8 9/16 .717 .670 .161 .140 .094 .081 .075 .049 .358 .205 .061 .065 .039 .653 4
1/2 3/4 .815 .765 .156 .130 .106 .091 .072 .046 .402 .252 .068 .081 .049 .739 4