TRUSS, ROUND and
FILLISTER HEAD MACHINE SCREW
Head Dimensions

Truss Head Machine Screws Combo Drive Truss Head Machine Screws Round Head Machine Screws Combo Drive Round Head Machine Screws Fillister Head Machine Screws



Head Dimensions for Truss Head Machine Screws

Nominal
Size
A H J T M G N Phillips
Driver
Size
Head
Diameter
Head
Height
Slot Width Slot Depth Dimensions of Recess
Diameter Depth Width
Max Min Max Min Max Min Max Min Max Min Max Min Min
2 .194 .180 .053 .044 .031 .023 .031 .022 .104 .091 .059 .041 .018 1
3 .226 .211 .061 .051 .035 .027 .036 .026 .110 .097 .066 .049 .018 1
4 .257 .241 .069 .059 .039 .031 .040 .030 .112 .099 .069 .051 .018 1
5 .289 .272 .078 .066 .043 .035 .045 .034 .128 .115 .085 .067 .019 1
6 .321 .303 .086 .074 .048 .039 .050 .037 .158 .145 .084 .059 .027 2
8 .384 .364 .102 .088 .054 .045 .058 .045 .173 .160 .099 .074 .029 2
10 .448 .425 .118 .103 .060 .050 .068 .053 .188 .175 .115 .090 .030 2
12 .511 .487 .134 .118 .067 .056 .077 .061 .248 .235 .128 .103 .032 3
1/4 .573 .546 .150 .133 .075 .064 .087 .070 .263 .250 .143 .118 .033 3
5/16 .698 .666 .183 .162 .084 .072 .106 .085 .352 .339 .193 .168 .059 4
3/8 .823 .787 .215 .191 .094 .081 .124 .100 .383 .370 .226 .202 .063 4



Combination Drive Truss Head Machine Screw Head Dimensions

Top of screw head image
Nominal
Size
A H J T M G N Recess
Penetration
Gaging Depth
Phillips
Driver
Size
Head
Diameter
Head
Height
Slot Width Slot Depth Dimensions of Recess
Diameter Depth Width
Max Min Max Min Max Min Max Min Max Min Max Min Min Max Min
4 .257 .241 .069 .059 .039 .031 .040 .030 .112 .099 .069 .051 .018 .062 .044 1
6 .321 .303 .086 .074 .048 .039 .050 .037 .158 .145 .084 .059 .027 .073 .048 2
8 .384 .364 .102 .088 .054 .045 .058 .045 .173 .160 .099 .074 .029 .088 .063 2
10 .448 .425 .118 .103 .060 .050 .068 .053 .188 .175 .115 .090 .030 .104 .079 2
12 .511 .487 .134 .118 .067 .056 .077 .061 .248 .235 .128 .103 .032 .111 .086 3
1/4 .573 .546 .150 .133 .075 .064 .087 .070 .263 .250 .143 .118 .033 .126 .101 3



Head Dimensions for Round Head Machine Screws - ANSI B18.6.3

Slotted   Phillips
Nominal
Size
A H J T M G N Phillips
Driver
Size
Head
Diameter
Height of Head Slot Width Slot Depth Dimensions of Recess
Diameter Depth Width
Max Min Max Min Max Min Max Min Max Min Max Min
2 .162 .146 .069 .059 .031 .023 .048 .037 .100 .087 .053 .017 1
3 .187 .169 .078 .067 .035 .027 .053 .040 .109 .096 .062 .018 1
4 .211 .193 .086 .075 .039 .031 .058 .044 .118 .105 .072 .019 1
5 .236 .217 .095 .083 .043 .035 .063 .047 .154 .141 .074 .027 2
6 .260 .240 .103 .091 .048 .039 .068 .051 .162 .149 .084 .027 2
8 .309 .287 .120 .107 .054 .045 .077 .058 .178 .165 .101 .030 2
10 .359 .334 .137 .123 .060 .050 .087 .065 .195 .182 .119 .031 2
12 .408 .382 .153 .139 .067 .056 .096 .073 .249 .236 .125 .032 3
1/4 .472 .443 .175 .160 .075 .064 .109 .082 .268 .255 .147 .034 3
5/16 .590 .557 .216 .198 .084 .072 .132 .099 .308 .295 .187 .040 3
3/8 .708 .670 .256 .237 .094 .081 .155 .117 .387 .374 .228 .064 4
1/2 .813 .766 .355 .332 .106 .091 .211 .159 .416 .403 .256 .068 4



Head Dimensions for Combination Drive Round Head Machine Screws

Top of screw head image
Nominal
Size
A H J T M G N Phillips
Driver
Size
Head
Diameter
Height of Head Slot Width Slot Depth Dimensions of Recess
Diameter Depth Width
Max Min Max Min Max Min Max Min Max Min Max Min
4 .211 .193 .086 .075 .039 .031 .058 .044 .118 .105 .072 .019 1
6 .260 .240 .103 .091 .048 .039 .068 .051 .162 .149 .084 .027 2
8 .309 .287 .120 .107 .054 .045 .077 .058 .178 .165 .101 .030 2
10 .359 .334 .137 .123 .060 .050 .087 .065 .195 .182 .119 .031 2
12 .408 .382 .153 .139 .067 .056 .096 .073 .249 .236 .125 .032 3
1/4 .472 .443 .175 .160 .075 .064 .109 .082 .268 .255 .147 .034 3
5/16 .590 .557 .216 .198 .084 .072 .132 .099 .308 .295 .187 .040 3
3/8 .708 .670 .256 .237 .094 .081 .155 .117 .387 .374 .228 .064 4



Head Dimensions for Fillister Head Machine Screws - ANSI B18.6.3

Nominal
Size
A H O J T M G N Phillips
Driver
Size
Head
Diameter
Head Height Slot Width Slot Depth Dimensions of Recess
Side Height Total Height Diameter Depth Width
Max Min Max Min Max Min Max Min Max Min Max Min Max Min
0 .096 .083 .043 .038 .055 .047 .023 .016 .025 .015 .067 .054 .039 .013 0
2 .140 .124 .062 .053 .083 .066 .031 .023 .037 .025 .104 .091 .059 .017
3 .161 .145 .070 .061 .095 .077 .035 .027 .043 .030 .112 .099 .068 .019 1
4 .183 .166 .079 .069 .107 .088 .039 .031 .048 .035 .122 .109 .078 .019 1
5 .205 .187 .088 .078 .120 .100 .043 .035 .054 .040 .143 .130 .067 .027 2
6 .226 .208 .096 .086 .132 .111 .048 .039 .060 .045 .166 .153 .091 .028 2
8 .270 .250 .113 .102 .156 .133 .054 .045 .071 .054 .182 .169 .108 .030 2
10 .313 .292 .130 .118 .180 .156 .060 .050 .083 .064 .199 .186 .124 .031 2
12 .357 .334 .148 .134 .205 .178 .067 .056 .094 .074 .259 .246 .141 .034 3
1/4 .414 .389 .170 .155 .237 .207 .075 .064 .109 .087 .281 .268 .161 .036 3
5/16 .518 .490 .211 .194 .295 .262 .084 .072 .137 .110 .322 .309 .203 .042 3
3/8 .622 .590 .253 .233 .355 .315 .094 .081 .164 .133 .389 .376 .233 .065 4




Smith Fastener Company • 8181 State Street, South Gate, California 90280
Phone: ( 323 ) 587-0382 • FAX: ( 323 ) 587-8712 • E-mail: [email protected]
Copyright © 2009 by Smith Fastener Company

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