OVAL HEAD MACHINE SCREWS
Head Dimensions

Slotted Oval Head Machine Screws Undercut Slotted Oval Head Machine Screws
Phillips Oval Head Machine Screws Undercut Phillips Oval Head Machine Screws

Head Dimensions for Oval Head Machine Screws
ANSI B18.6.3

Nominal
Size
A H O J T M R N F G Phillips
Driver
Size
Head
Diameter
Head Height Slot Dimensions Recess Dimensions Protrusion
Above Gaging
Diameter
Gaging
Diameter
Side Total Width Depth Dia Depth Width
Max Min Max Max Max Min Max Min Rew Ref Ref Max Min
0 .112 .096 .035 .056 .023 .016 .030 .025 .068 .036 .014 .047 .031 .078 0
1 .137 .120 .043 .068 .026 .019 .038 .031 .070 .039 .015 .053 .035 .101 0
2 .162 .144 .051 .080 .031 .023 .045 .037 .106 .060 .018 .058 .039 .124 1
3 .187 .167 .059 .092 .035 .027 .052 .043 .118 .072 .019 .064 .044 .148 1
4 .212 .191 .067 .104 .039 .031 .059 .049 .130 .086 .019 .069 .048 .172 1
5 .237 .215 .075 .116 .043 .035 .067 .055 .152 .073 .028 .075 .053 .196 2
6 .262 .238 .083 .128 .048 .039 .074 .060 .172 .092 .030 .080 .057 .220 2
8 .312 .285 .100 .152 .054 .045 .088 .072 .186 .107 .031 .091 .066 .267 2
10 .362 .333 .116 .176 .060 .050 .103 .084 .202 .125 .033 .102 .075 .313 2
12 .412 .380 .132 .200 .067 .056 .117 .096 .264 .140 .038 .113 .084 .362 3
1/4 .477 .442 .153 .232 .075 .064 .136 .112 .284 .160 .040 .129 .095 .424 3
5/16 .597 .556 .191 .290 .084 .072 .171 .141 .384 .226 .065 .155 .117 .539 4
3/8 .717 .670 .230 .347 .094 .081 .206 .170 .404 .245 .068 .182 .139 .653 4
7/16 .760 .715 .223 .345 .094 .081 .210 .174 .416 .257 .070 .195 .150 .690 4
1/2 .815 .765 .223 .354 .106 .091 .216 .176 .430 .271 .071 .212 .163 .739 4



Head Dimensions for Undercut Oval Head Machine Screws - ANSI B18.6.3

Nominal
Size
These
Lengths
or
Shorter
are
Undercut
A H O J T M R N F G Phillips
Driver
Size
Head Dimensions Slot Dimensions Recess Dimensions Protrusion
Above Gaging
Diameter
Gaging
Diameter
Diameter Side
Height
Total
Height
Width Depth Dia Depth Width
Max Min Max Max Min Max Min Ref Ref Ref Max Min Max Min
0 1/8 .112 .096 .025 .046 .033 .023 .016 .028 .022 .068 .036 .014 .047 .031 .078 0
1 1/8 .137 .120 .031 .056 .042 .026 .019 .034 .027 .070 .039 .015 .053 .035 .101 0
2 1/8 .162 .144 .036 .065 .050 .031 .023 .040 .033 .106 .060 .018 .058 .039 .124 1
3 1/8 .187 .167 .042 .075 .059 .035 .027 .047 .038 .118 .072 .019 .064 .044 .148 1
4 3/16 .212 .191 .047 .084 .067 .039 .031 .053 .043 .130 .086 .019 .069 .048 .172 1
5 3/16 .237 .215 .053 .094 .076 .043 .035 .059 .048 .152 .073 .028 .075 .053 .196 2
6 3/16 .237 .215 .053 .094 .076 .043 .035 .059 .048 .152 .073 .028 .075 .053 .196 2
8 1/4 .312 .285 .070 .123 .101 .054 .045 .078 .064 .186 .107 .031 .091 .066 .267 2
10 5/16 .362 .333 .081 .142 .118 .060 .050 .090 .074 .202 .125 .033 .102 .075 .313 2
12 3/8 .412 .380 .092 .161 .135 .067 .056 .103 .085 .264 .140 .038 .113 .084 .362 3
1/4 7/16 .477 .442 .107 .186 .158 .075 .064 .119 .098 .284 .160 .040 .129 .095 .424 3
5/16 1/2 .597 .556 .134 .232 .198 .084 .072 .149 .124 .374 .214 .064 .155 .117 .539 4
3/8 9/16 .717 .670 .161 .278 .239 .094 .081 .179 .149 .394 .223 .066 .182 .139 .653 4
7/16 5/8 .760 .715 .156 .279 .239 .094 .081 .184 .154 .404 .245 .068 .195 .150 .690 4
1/2 3/4 .815 .765 .156 .288 .244 .106 .091 .204 .169 .416 .257 .070 .212 .136 .739 4

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