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Head Dimensions for 82° Flat Head Machine Screws - ANSI B18.6.3
Nominal Size A H J T M G N Phillips
Driver
Size
Head
Diameter		 Height
of
Head		 Width
of
Slot		 Depth
of
Slot		 Dimensions of Recess
Diameter Depth Width
Max Min Max Min Max Min Max Min Max Min Max Min
0 .119 .099 .035 .026 .023 .016 .015 .010 .069 .056 .043 .014 0
1 .146 .123 .043 .033 .026 .019 .019 .012 .077 .064 .051 .015 0
2 .172 .147 .051 .040 .031 .023 .023 .015 .102 .089 .063 .017 1
4 .225 .195 .067 .055 .039 .031 .030 .020 .128 .115 .089 .018 1
5 .252 .220 .075 .062 .043 .035 .034 .022 .154 .141 .086 .027 2
6 .279 .244 .083 .069 .048 .039 .038 .024 .174 .161 .106 .029 2
8 .332 .292 .100 .084 .054 .045 .045 .029 .189 .176 .121 .030 2
10 .385 .340 .116 .098 .060 .050 .053 .034 .204 .191 .136 .032 2
12 .438 .389 .132 .112 .067 .056 .060 .039 .268 .255 .156 .035 3
1/4 .507 .452 .153 .131 .075 .064 .070 .046 .283 .270 .171 .036 3
5/16 .635 .568 .191 .165 .084 .072 .088 .058 .365 .352 .216 .061 4
3/8 .762 .685 .230 .200 .094 .081 .106 .070 .393 .380 .245 .065 4
1/2 .875 .775 .223 .186 .106 .091 .103 .065 .424 .411 .276 .069 4



Head Dimensions for 100° Flat Head Machine Screws - ANSI B18.6.3
Nominal Size A H M G N Phillips
Driver
Size
Head
Diameter		 Dimensions of Recess
Edge Sharp Edge
Rounded
or Flat		 Height
of
Head		 Diameter Depth Width
Max Min Ref Max Min Max Min Min
0 .119 .096 .026 .061 .048 .035 .019 .012 0
2 .172 .143 .037 .095 .082 .056 .040 .012 1
4 .225 .191 .049 .117 .104 .078 .062 .018 1
6 .279 .238 .060 .154 .141 .086 .063 .027 2
8 .332 .285 .072 .169 .156 .101 .078 .028 2
10 .385 .333 .083 .184 .171 .116 .093 .030 2
14 .507 .442 .110 .247 .234 .135 .112 .033 3



Head Dimensions for Undercut Flat Head Machine Screws - ANSI B18.6.3
Nominal Size L A H J T M G N Phillips
Driver
Size
These
Lengths
or
Shorter
are
Undercut		 Head Diameter Height
of Head		 Slot Width Slot Depth Recess Dimensions
Max
Edge
Sharp		 Min
Edge
Round
or Flat		 Diameter Depth Width
Max Min Max Min Max Min Max Min Max Min Min
0 1/8 .119 .099 .025 .018 .023 .016 .011 .007 .069 .056 .043 .027 .014 0
1 1/8 .146 .123 .031 .023 .026 .019 .014 .009 .077 .064 .051 .035 .015 0
2 1/8 .172 .147 .036 .028 .031 .023 .016 .011 .095 .082 .063 .040 .017 1
4 3/16 .225 .195 .047 .038 .039 .031 .022 .014 .117 .104 .078 .062 .018 1
5 3/16 .252 .220 .053 .043 .043 .035 .024 .016 .128 .115 .089 .073 .018 1
6 3/16 .279 .244 .059 .048 .048 .039 .027 .017 .146 .133 .078 .055 .025 2
8 1/4 .332 .292 .070 .058 .054 .045 .032 .021 .174 .161 .106 .083 .029 2
10 5/16 .385 .340 .081 .068 .060 .050 .037 .024 .189 .176 .121 .098 .030 2
12 3/8 .438 .389 .092 .078 .067 .056 .043 .028 .233 .220 .121 .098 .030 3
1/4 7/16 .507 .452 .107 .092 .075 .064 .050 .032 .250 .237 .136 .113 .032 3
5/16 1/2 .635 .568 .134 .116 .084 .072 .062 .041 .317 .304 .168 .146 .053 4
3/8 9/16 .762 .685 .161 .140 .094 .081 .075 .049 .365 .352 .216 .194 .061 4



Head Dimensions for Torx® Drive Flat Head Machine Screws - Camcar
Nominal Size G T B F Maximum
Penetration
of "No-Go"
Gauge
(Fallaway)		 Torx®
Driver
Size
Head Diameter Head
Height		 Recess
Diameter		 Gauge
Penetration
Max Sharp Min Sharp Abs Min Ref Ref Min
4 .225 .209 .195 .067 .094 .028 .016 T8
6 .279 .257 .244 .083 .111 .035 .020 T10
8 .332 .308 .292 .100 .132 .040 .020 T15
10 .385 .359 .340 .116 .155 .050 .025 T20
1/4 .507 .477 .452 .153 .200 .075 .030 T27