PAN HEAD MACHINE SCREW
Head Dimensions

Pan Head Machine Screws and SEMS Combination Drive Pan Head Machine Screws Torx® Drive Pan Head Machine Screws Pozidriv® Drive Pan Head Machine Screws Square Drive Pan Head Machine Screws



Head Dimensions for Pan Head Machine Screws and SEMS
ANSI B18.6.3

Nominal
Size
A H H1 J T M G N Phillips
Driver
Size
Head
Diameter
Height of Head Slot Width Slot Depth Dimensions of Recess
Slotted Recessed Diameter Depth Width
Max Min Max Min Max Min Max Min Max Min Max Min Max Min
0 .116 .104 .039 .031 .044 .036 .023 .016 .022 .014 .067 .054 .039 .013 0
2 .167 .155 .053 .045 .062 .053 .031 .023 .031 .022 .104 .091 .059 .017 1
3 .193 .180 .060 .051 .071 .062 .035 .027 .036 .026 .112 .099 .068 .019 1
4 .219 .205 .068 .058 .080 .070 .039 .031 .040 .030 .122 .109 .078 .019 1
5 .245 .231 .075 .065 .089 .079 .043 .035 .045 .034 .158 .145 .083 .028 2
6 .270 .256 .082 .072 .097 .087 .048 .039 .050 .037 .166 .153 .091 .028 2
8 .322 .306 .096 .085 .115 .105 .054 .045 .058 .045 .182 .169 .108 .030 2
10 .373 .357 .110 .099 .133 .122 .060 .050 .068 .053 .199 .186 .124 .031 2
12 .425 .407 .125 .1125 .151 .139 .067 .056 .077 .061 .259 .246 .141 .034 3
1/4 .492 .473 .144 .130 .175 .162 .075 .064 .087 .070 .281 .268 .161 .036 3
5/16 .615 .594 .178 .162 .218 .203 .084 .072 .106 .085 .350 .337 .193 .059 4
3/8 .740 .716 .212 .195 .261 .244 .094 .081 .124 .100 .389 .376 .233 .065 4

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Combination Drive Pan Head Machine Screws

Nominal
Screw
Size
G H J A M T N Recess
Penetration
Driver
Size
Head Dimensions Slot Dimensions Recess Dimensions
Head
Diameter
Head
Height
Width Depth Width Depth Wing
Depth
Max Min Max Min Max Min Max Min Max Min Max Min Min Max Min
4 .219 .205 .080 .070 .039 .031 .040 .030 .122 .109 .078 .060 .019 .071 .053 1
6 .270 .256 .097 .087 .048 .039 .050 .037 .166 .153 .091 .066 .028 .080 .055 2
8 .322 .306 .115 .105 .054 .045 .058 .045 .182 .169 .108 .082 .030 .097 .071 2
10 .373 .357 .133 .122 .060 .050 .068 .053 .199 .186 .124 .100 .031 .113 .089 2
12 .425 .407 .125 .112 .067 .056 .077 .061 .259 .246 .141 .115 .034 .124 .098 3
1/4 .492 .473 .175 .162 .075 .064 .087 .070 .281 .268 .161 .135 .036 .144 .118 3
5/16 .615 .594 .218 .203 .084 .072 .106 .085 .350 .337 .193 .169 .059 .173 .149 4

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Torx® Drive Pan Head Machine Screws - Camcar

Screw
Size
D H R G Driver
Size
Head Dimensions Recess Dimensions
Head Diameter Head Height Diameter
(Ref)
Gauge
Penetration
(Min)
Maximum
Penetration
(Falloway)
Max Min Max Min
2 .167 .155 .062 .053 .094 .030 .022 T8
4 .219 .205 .080 .070 .111 .035 .026 T10
6 .270 .256 .097 .087 .132 .045 .031 T15
8 .322 .306 .115 .105 .155 .055 .036 T20
10 .373 .357 .133 .122 .178 .070 .040 T25
1/4 .492 .473 .175 .162 .221 .085 .044 T30
5/16 .615 .594 .218 .203 .266 .105 .047 T40
Torx® is a registered trademark of the Camcar Corporation, division of Textron Industries.

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Pozidrive® (Type 1A) Pan Head Machine Screws
ASME B18.6.3 1998

Screw
Size
A H M G N Recess
Penetration
Gaging
Depth
Driver
Size
Head Diameter Head Height Recess Dimensions
Diameter Depth Width
Max Min Max Min Max Min Max Min Min Max Min
2 .167 .155 .062 .053 .104 .091 .064 .048 .028 .053 .037 1
4 .219 .205 .080 .070 .122 .109 .083 .067 .029 .072 .056 1
6 .270 .256 .097 .087 .162 .149 .092 .074 .040 .076 .058 2
8 .322 .306 .115 .105 .177 .164 .108 .090 .041 .092 .074 2
10 .373 .357 .133 .122 .193 .180 .125 .106 .041 .108 .090 2
12 .425 .407 .151 .139 .254 .241 .139 .121 .056 .117 .099 3
1/4 .492 .473 .175 .162 .273 .260 .159 .141 .057 .137 .119 3
Pozidriv® is a trademark of the Phillips Screw Company. Our fasteners with the 1A-drive are
not manufactured by or connected with the producers of Pozidriv® fasteners.

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Square Socket Pan Head Machine Screws - IFI

Nominal
Size or
Basic
Screw
Diameter
A H M T P Driver
Size
Head Diameter Head Height Recess Square Recess Depth Penetration
Gaging Depth
Max Min Max Min Max Min Max Min Max Min
4 .112 .219 .205 .086 .075 .071 .0696 .073 .063 .038 .032 0
6 .138 .270 .256 .103 .091 .091 .090 .113 .105 .065 .057 1
8 .164 .322 .306 .120 .107 .1126 .111 .140 .119 .075 .065 2
10 .1900 .373 .357 .137 .123 .1126 .111 .140 .119 .075 .065 2
12 .2160 .425 .407 .153 .139 .133 .1315 .165 .155 .095 .085 3
1/4 .2500 .492 .473 .175 .160 .133 .1315 .165 .155 .095 .085 3
5/16 .3125 .615 .594 .216 .198 .191 .1895 .201 .191 .100 .090 4
Square Socket type of recess has a square center opening, with slightly tapered sides
and a conical bottom.

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Smith Fastener Company • 3613 East Florence Avenue, Bell, California, 90201
Phone: ( 323 ) 587-0382 • FAX: ( 323 ) 587-8712 • E-mail: sales@smithfast.com
Copyright © 2009 by Smith Fastener Company

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