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43° SCREWS
screw provides an allowance for error in pitch, or lead, and for the
wear of tap in service.
This form of tap thread is recommended as being stronger
and more serviceable than the so-called V thread, but it has been
suggested that strict adherence to this form might, in the
case of small taps, add to their cost. Taps with V threads and
with the correct angle and pitch diameters used in connection
with tap drills of correct diameter, are permissible.
TABLE No. 69—A. S. M. E. Special Sizes of Taps for
flachine Screws.
u (B-C
Minimum Maximum
»- s
(LiS
u
"3
%
in u
V
U
"c3
v
V *r1 <-> —> >4
£1 13 C a <u <v V - HI V V
6°
£ <i;i-H & E S s tf E S E S E * E
3 J3&3 N $& a « 8-53 x-2 a a 8.5 •2&
z h£ w WQ s5 «Q HQ £Q f*Q Qh
I 64 • 073 • 074 1 .0640 .0538 .0768 .0651 •0559 •055
2 56 .086 .0872 .0756 .064c .0903 .0767 .0663 .067
3 48 .099 .1003 .0868 .0732 .1038 .0880 .0757 .076
4 40 .112 .1134 .0972 .0809 .1175 .0986 .0837 .082
36 .1135 .0955 .0774 .1179 .0969 .0803 .081
5 40 •125 .1264 .1102 .0939 • I3°5 .1116 .0967 .098
36 .1265 .1085 .0904 • I3°9 .1099 .0933 • 0935
6 36 .138 .1395 .1215 .1034 .1439 .1229 .IO63 .1065
32 • I396 .H93 .099° .1445 .1208 .1021 .1015
7 32 •151 .1526 .1323 .1120 .1575 .1338 .1151 .116
30 .1526 .I3 10 .1093 .1578 .1326 .1125 .113
8 32 .164 .1656 .1453 .1250 .1705 .1468 .1281 .1285
30 .1656 .1440 .1223 .1708 .1456 .1255 .1285
9 30 .177 .1786 .1569 .1353 .1838 .1585 .1385 .1405
24 .1788 .1517 .1247 .1850 .1534 .1282 .1285
10 32 .190 .1916 .1713 .I5 10 .1965 .1728 •
I54 1 •154
24 .1918 .1647 .1377 .1980 .1664 .1412 .1405
12 24 .216 .2178 .1907 .1637 .2240 .1924 .1672 .166
14 20 .242 .2439 .2114 .1789 .25H .2132 .1826 .182
16 20 .268 .2699 • 2374 .2049 .2771 .2392 .2086 .209
18 18 .294 -2959 .2598 .2237 .3039 .2618 .2276 .228
20 18 .320 .3219 .2858 .2497 .3299 .2878 • 2536 •257
22 16 •346 .3480 • 3074 .2668 .3568 .3094 .2708 .272
24 18 •372 •
3739 .3378 .3017 .3819 • 3398 .30561.3125
26 H .398 .4001 •3537 .3073 .4099 •
3558 .3114’ 3125
28 16 .424 .4260 3854 •3448 •4348 .3874 .3488.348
30 16 .450 .452O .4114 3708 .4608I.4134I. 3748. 377
Tables No. 68 and No. 69 cover the list of special sizes of
screws and taps with the additional pitches for each, which are in
use for purposes requiring a different number of threads per inch
than is given in the list of standards. The form of thread is
the same in the special sizes as in the standard sizes.
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