Machinery's Handbook, 31st Edition
1782
MACHINE SCREWS AND NUTS Table 9. American National Standard Slotted Oval Countersunk Head Machine Screws ANSI/ASME B18.6.3-2013
O
H
A
A Min
J
80° 82°
Edge of Head May be Flat or Rounded
H
L
Head Side Height, H
Head Dia., A
Total Head Height, O
Slot Width, J
Slot Depth, T
Max L b
Nominal Size a or Basic Screw Dia.
Min., Edge Rounded or Flat
Max., Edge Sharp
Ref. .028 .035 .043 .051 .059 .067 .075 .083 .091 .100 .116 .132 .148 .153 .164 .180 .191 .196 .228 .230 .223 .223 .260 .298 .372
Max.
Min.
Max.
Min.
Max.
Min.
00
0.0470 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 0.5625 0.6250
… .087
.080 .096 .120 .144 .167 .191 .215 .238 .262 .285 .333 .380 .427 .442 .475 .522 .556 .569 .664 .670 .715 .765 .878 .990
.042 .034 .017 .010 .023 .016 .056 .041 .023 .016 .030 .025 .068 .052 .026 .019 .038 .031 .080 .063 .031 .023 .045 .037 .092 .073 .035 .027 .052 .043 .104 .084 .039 .031 .059 .049 .116 .095 .043 .035 .067 .055 .128 .105 .048 .039 .074 .060 .140 .115 .048 .039 .081 .066 .152 .126 .054 .045 .088 .072 .176 .148 .060 .050 .103 .084 .200 .169 .067 .056 .117 .224 .190 .075 .064 .132 .108 .232 .197 .075 .064 .136 .248 .212 .075 .064 .146 .120 .096 .112 .272 .233 .084 .072 .160 .132 .290 .248 .084 .072 .171 .141 .296 .254 .094 .072 .175 .144 .344 .297 .094 .081 .204 .168 .347 .300 .094 .081 .206 .170 .345 .295 .094 .081 .210 .174 .354 .299 .106 .091 .216 .176 .410 .350 .118 .102 .250 .207 .467 .399 .133 .116 .285 .235
1 / 8 1 / 8 1 / 8 1 / 8 3 / 16 3 / 16 3 / 16 1 / 4 5 / 16 3 / 8 7 / 16
.112 .137 .162 .187 .212 .237 .262 .312 .362 .412 .477
0 1 2 3 4 5 6 7 8
… .287
10 12 14 1 / 4 16 18 5 / 16 20 24 3 / 8 7 / 16 1 / 2 9 / 16 5 / 8 3 / 4
… .462 … .512 … .561 … .611 … .711 1 / 2 .597
9 / 16 5 / 8 3 / 4
.717 .760 .815
… .932 … 1.050
0.7500 .578 .497 .149 .131 .353 .293 a When specifying nominal size in decimals, zeros preceding decimal points and in the fourth decimal place are omitted. b These lengths or shorter are undercut. All dimensions are in inches. … 1.285 1.215
Table 10. American National Standard Header Points for Machine Screws before Threading ANSI/ASME B18.6.3-2013
Nom. Size
Threads per Inch
Max. P 0.125 0.138 0.149 0.156 0.170 0.187 0.221 0.237 0.270 0.295 0.316 0.342 0.367 0.399
Min. P 0.112 0.124 0.134 0.141 0.153 0.169 0.200 0.215 0.244 0.267 0.287 0.310 0.333
Max. L
40°–45°
P
24 32 24 28 20 28 18 24 16 24 14 20 13 20
10
1 1 ∕ 4
See Note
L
Nom. Size.
Threads per Inch
Max. P 0.057 0.060 0.074 0.079 0.086 0.088 0.090 0.098 0.114 0.118
Min. P 0.050 0.053 0.065 0.070 0.076 0.079 0.080 0.087 0.102 0.106
Max. L
12
1 3 ∕ 8
56 64 40 48 40 44 32 40 32 36
2
1 1 ∕ 2
1 ∕ 4
1
∕ 2
4
1 1 ∕ 2
5 ∕ 16
1
∕ 2
5
1 1 ∕ 2
3 ∕ 8
1
∕ 2
6
1 1 ∕ 2
7 ∕ 16
3
∕ 4
8
1
1 1 ∕ 2
1
∕ 2
0.362 All dimensions in inches. Edges of point may be rounded and end of point need not be flat nor perpendicular to shank. Machine screws normally have plain sheared ends but when specified may have header points, as shown above.
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