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432 SCREWS
TABLE No. 71—Dimensions of Heads of Machine Screws.
A. S. H. E. Standard.
A = diam. of body.
A = < diameter of body. B = 1.85A— .005 =
B = 2A— .(x>8= diameter of head.
diam. of head.
C = .7A = height of
C = A— .008
=thickness of head
head.
D = .173A + .015 =
!-739 width of slot.
D = 1 73A + .015 = width of slot. E = iC + .01 =
depth of slot.
E =-£-C = depth of slot.
1
B j
-82 Deg^ 1
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FLAT HEAD.
ROUND HEAD.
Num- I
ber A B C D E B c D E
.060 .112 .030 .025 .010 .106 .042 .025 .031
i .073 .138 • 037 .028 .012 .130 .051 .028 • 035
2 .086 . 164 .045 .030 .015 154 .060 .030 .040
3 .099 . 190 .052 .032 .017 .178 .069 .032 .044
4 .112 .216 .060 .034 .020 .202 .078 .034 .049
5 .125 .242 .067 .037 .022 .226 .087 .037 .053
6 .138 .268 • 075 .039 .025 .250 .097 .039 .058
7 .151 .294 .082 .041 .027 .274 .106 .041 .063
8 .164 .320 .090 .043 .030 .298 .115 .043 .067!
9 177 •
346 • 097 .046 .032 .322 .124 .046 .072;
IO .190 .372 .105 .048 .035 • 346 .133 .048 • 076j
ii .216 .424 . 120 .052 .040 •
394 • I5 1 .052 .085:
14 .242 476 .135 .057 .045 443 .169 .057 .094!
16 .268 •528 •150 .061 .050 491 .188 .061 .104;
18 .294 .580 .164 .066 .055 •
539 .206 .066 .113,
20 .320 .632 .179 .070 .060 .587 .224 .070 .122
22 • 346 .684 .194 • 075 .065 .635 .242 .075 .I3 1
!
24 •372 .736 .209 .079 .070 .683 .260 .079 •
I 4°
26 • 398 .788 .224 .084 • 075 •731 .279 .084 • 149
28 .424 .840 • 239 .088 .080 •779 .297 .088 .158
30 •450 .892 •254 • 093 .085 .827 .315 .093 .167;
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