Hex Head and Hex Washer Head Machine Screws

Hex and
Hex Washer Head
Machine Screws		 Phillips
Hex Washer Head
Machine Screws
Domestic		 Phillips
Hex Washer Head
Machine Screws
Imported



Hex Head and Hex Washer Head Machine Screws
ANSI B18.6.3 - 1998

Nominal
Size		 A W H F U J T
Width
Across
Flats		 Width
Across
Corners		 Head
Height		 Washer
Diameter		 Washer
Thickness		 Slot
Width		 Slot
Depth
Max Min Min Max Min Max Min Max Min Max Min Max Min
2 .125 .120 .134 .050 .040 .166 .154 .016 .010 - - - -
4 .188 .181 .202 .060 .049 .243 .225 .019 .011 .039 .031 .042 .025
5 .188 .181 .202 .070 .058 .260 .240 .025 .015 .043 .035 .049 .030
6 .250 .244 .272 .093 .080 .328 .302 .025 .015 .048 .039 .053 .033
8 .250 .244 .272 .110 .096 .348 .322 .031 .019 .054 .045 .074 .052
10 .312 .305 .340 .120 .105 .414 .384 .031 .019 .060 .050 .080 .057
12 .312 .305 .340 .155 .139 .432 .398 .039 .022 .067 .056 .103 .077
1/4 .375 .367 .409 .190 .172 .520 .480 .050 .030 .075 .064 .111 .083
5/16 .500 .489 .545 .230 .208 .676 .624 .055 .035 .084 .072 .134 .100
3/8 .562 .551 .614 .295 .270 .780 .720 .063 .037 .094 .081 .168 .131
1/2 .750 .735 .820 .400 .367 1.040 .960 .085 .050 - - - -
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Domestic Phillips Hex Washer Head Machine Screws

Nominal
Size		 A W H F U M G N Recess
Penetration
Gaging
Depth		 Phillips
Driver
Size
Width
Across
Flats		 Width
Across
Corners		 Head
Height		 Washer
Diameter		 Washer
Thickness		 Recess Dimensions
Dia Depth Width
Max Min Min Max Min Max Min Max Min Ref Ref Ref Max Min
4 .188 .181 .202 .060 .049 .243 .225 .019 .011 .096 .055 .017 .056 .040 1
6 .250 .244 .272 .093 .080 .328 .302 .025 .015 .168 .094 .029 .095 .072 2
8 .250 .244 .272 .110 .096 .348 .322 .031 .019 .168 .094 .029 .095 .072 2
10 .312 .305 .340 .120 .105 .414 .384 .031 .019 .176 .102 .030 .103 .080 2
1/4 .375 .367 .409 .190 .172 .520 .480 .050 .030 .262 .144 .035 .139 .116 3
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Imported Phillips Hex Washer Head Machine Screws

Nominal
Size		 A W H F U M G Phillips
Driver
Size
Width
Across
Flats		 Width
Across
Corners		 Head
Height		 Washer
Diameter		 Washer
Thickness		 Recess Dimensions
Diameter Depth
Max Min Min Max Min Max Min Max Min Max Min Max Min
4 .188 .181 .202 .060 .049 .243 .225 .019 .011 .102 .089 .063 .047 1
6 .250 .244 .272 .093 .080 .328 .302 .025 .015 .164 .160 .086 .079 2
8 .250 .244 .272 .110 .096 .348 .322 .031 .019 .188 .176 .120 .114 2
10 .312 .305 .340 .120 .105 .414 .384 .031 .019 .174 .161 .106 .083 2
1/4 .375 .367 .409 .190 .172 .520 .480 .050 .030 .233 .220 .156 .133 3
There is no single set of standards for the size of Phillips drives used in hex head machine screws. Variations of imported screws of this type are generally due to differences in the tooling used to manufacture the imported screws. These values are only listed as a service. We make no recommendation as to which is preferred.

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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
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