BINDING HEAD MACHINE SCREW
Head Dimensions

Slotted Undercut Binding Head
Machine Screws
Phillips Binding Head
Machine Screws


Phillips Binding Head Machine Screws
ANSI B18.6.3 - 1998

Nominal
Size
A O F M G N Phillips
Driver
Size
Head
Diameter
Total Head
Height
Head Oval
Height
Recess
Diameter
Recess
Depth
Recess
Width
Max Min Max Min Max Min Max Min Max Min Min
2 .181 .171 .050 .043 .018 .013 .100 .087 .058 .041 .017 1
4 .235 .223 .068 .061 .025 .018 .118 .105 .077 .059 .017 1
6 .290 .275 .087 .078 .032 .024 .160 .147 .088 .064 .026 2
8 .344 .326 .105 .095 .039 .029 .186 .173 .114 .090 .028 2
10 .399 .378 .123 .112 .045 .034 .205 .192 .134 .109 .029 2
1/4 .525 .498 .165 .152 .061 .046 .281 .268 .164 .140 .046 3


Head Dimensions for
Slotted Undercut Binding Head Machine Screws - B18.6.3

Nominal
Size
A F O J T U X
Head
Diameter
Head Height Slot Width Slot Depth Dimensions of Undercut
Oval Height Total Height Diameter Depth
Max Min Max Min Max Min Max Min Max Min Max Min Max Min
2 .181 .171 .018 .013 .050 .043 .031 .023 .030 .020 .141 .124 .010 .005
3 .208 .197 .022 .016 .059 .052 .035 .027 .036 .025 .162 .143 .011 .006
4 .235 .223 .025 .018 .068 .061 .039 .031 .042 .030 .184 .161 .012 .007
5 .263 .249 .029 .021 .078 .069 .043 .035 .048 .035 .205 .180 .014 .009
6 .290 .275 .032 .024 .087 .078 .048 .039 .053 .040 .226 .199 .015 .010
8 .344 .326 .039 .029 .105 .095 .054 .045 .065 .050 .269 .236 .017 .012
10 .399 .378 .045 .034 .123 .112 .060 .050 .077 .060 .312 .274 .020 .015
12 .454 .430 .052 .039 .141 .130 .067 .056 .089 .070 .354 .311 .023 .018
1/4 .525 .498 .061 .046 .165 .152 .075 .064 .105 .084 .410 .360 .026 .021




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