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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


Top of screw head image

Combination Drive Truss Head Machine Screw Head Dimensions
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


Slotted   Phillips

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


Top of screw head image

Head Dimensions for Combination Drive Round Head Machine Screws
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

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Smith Fastener Company, A California Corporation - 3613 East Florence Avenue, Bell, California, 90201 - Phone: ( 323 ) 587-0382 - FAX: ( 323 ) 587-8712 - E-mail: sales@smithfast.com - Copyright © 2000 by Smith Fastener Company - Last updated: May 22nd, 2006 - http://www.smithfast.com/trussrndfill.htm