Machinery's Handbook, 31st Edition
MACHINE SCREWS AND NUTS 1783 Table 11. American National Standard Slotted Binding Head and Slotted Undercut Oval Countersunk Head Machine Screws ANSI/ASME B18.6.3-2013
O
T
T
5° ± 3°
X
See Note b
J
80° 82°
J
U
H
A
F
L
A
O L
SLOTTED BINDING HEAD TYPE
Nominal Size a or Basic Screw Dia. Head Dia., A Undercut b Depth, X Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Total Head Height, O Head Oval Height, F Slot Width, J Slot Depth, T Undercut b Dia., U 0000 0.0210 .046 .040 .014 .009 .006 .003 .008 .004 .009 .005 … … … … 000 0.0340 .073 .067 .021 .015 .008 .005 .012 .006 .013 .009 … … … … 00 0.0470 .098 .090 .028 .023 .011 .007 .017 .010 .018 .012 … … … … 0 0.0600 .126 .119 .032 .026 .012 .008 .023 .016 .018 .009 .098 .086 .007 .002 1 0.0730 .153 .145 .041 .035 .015 .011 .026 .019 .024 .014 .120 .105 .008 .003 2 0.0860 .181 .171 .050 .043 .018 .013 .031 .023 .030 .020 .141 .124 .010 .005 3 0.0990 .208 .197 .059 .052 .022 .016 .035 .027 .036 .025 .162 .143 .011 .006 4 0.1120 .235 .223 .068 .061 .025 .018 .039 .031 .042 .030 .184 .161 .012 .007 5 0.1250 .263 .249 .078 .069 .029 .021 .043 .035 .048 .035 .205 .180 .014 .009 6 0.1380 .290 .275 .087 .078 .032 .024 .048 .039 .053 .040 .226 .199 .015 .010 8 0.1640 .344 .326 .105 .095 .039 .029 .054 .045 .065 .050 .269 .236 .017 .012 10 0.1900 .399 .378 .123 .112 .045 .034 .060 .050 .077 .060 .312 .274 .020 .015 12 0.2160 .454 .430 .141 .130 .052 .039 .067 .056 .089 .070 .354 .311 .023 .018 1 ∕ 4 0.2500 .525 .498 .165 .152 .061 .046 .075 .064 .105 .084 .410 .360 .026 .021 5 ∕ 16 0.3125 .656 .622 .209 .194 .077 .059 .084 .072 .134 .108 .513 .450 .032 .027 3 ∕ 8 0.3750 .788 .746 .253 .235 .094 .071 .094 .081 .163 .132 .615 .540 .039 .034 a Where specifying nominal size in decimals, zeros preceding decimal points and in the fourth decimal place are omitted. b Unless otherwise specified, slotted binding head machine screws are not undercut. SLOTTED UNDERCUT OVAL COUNTERSUNK HEAD TYPES
Head Side Height, H
Total Head Height, O
Slot Width, J
Slot Depth, T
Head Dia., A
Nominal Size a or Basic Screw Dia.
Max. L a
Max. .112 .137 .162 .187 .212 .237 .262 .312 .362 .412 .477
Min. .096 .120 .144 .167 .191 .215 .238 .262 .285 .333 .380 .427 .442 .475 .522 .556 .569 .664 .670 .715 .765
Ref. .025 .031 .036 .042 .047 .053 .059 .064 .070 .081 .092 .104 .107 .115 .126 .134 .137 .160 .161 .156 .156
Max.
Min.
Max.
Min.
Max.
Min.
1 / 8 1 / 8 1 / 8 1 / 8 3 / 16 3 / 16 3 / 16 1 / 4 5 / 16 3 / 8 7 / 16
.046 .033 .023 .016 .028 .022 .056 .042 .026 .019 .034 .027 .065 .050 .031 .023 .040 .033 .075 .059 .035 .027 .047 .038 .084 .067 .039 .031 .053 .043 .094 .076 .043 .035 .059 .048 .104 .084 .048 .039 .065 .053 .113 .093 .048 .039 .071 .059 .123 .101 .054 .045 .078 .064 .142 .118 .060 .050 .090 .074 .161 .135 .067 .056 .103 .085 .180 .153 .075 .064 .115 .096 .186 .158 .075 .064 .119 .098 .199 .170 .075 .064 .127 .106 .218 .187 .084 .072 .140 .116 .232 .198 .084 .072 .149 .124 .237 .204 .084 .072 .152 .127 .275 .238 .094 .081 .177 .148 .278 .239 .094 .081 .179 .149 .279 .239 .094 .081 .184 .154 .288 .244 .106 .091 .204 .169
0 1 2 3 4 5 6 7 8
0.0600 0.0730 0.0860 0.0990 0.1120 0.1250 0.1380 0.1510 0.1640 0.1900 0.2160 0.2420 0.2500 0.2680 0.2940 0.3125 0.3200 0.3720 0.3750 0.4375 0.5000
… .287
10 12 14 1 / 4 16 18 5 / 16 20 24 3 / 8 7 / 16 1 / 2
… .462 … .512 … .561 … .611 … .711 1 / 2 .597
9 / 16 5 / 8 3 / 4
.717 .760 .815
a These lengths or shorter are undercut. All dimensions are in inches.
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