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426 SCREWS
TABLE No. 67—A. S. M. E. Standard Taps for
Machine Screws.
co -3
Minimum Maximum
H ° CO CO "3
a
u
CO
u
—^ CJ
12 a a co CO CO a "S CO CO "Sq
s
3
8
"
co a S e * s fc e f, s - a e w
V
x •- a & 8.2 ** a « 8.2 •- rt
Z Hdn ’si aa KQ «Q WQ SQ «Q ^ i_
8o .060 . 0609 .0528 .0447 .0632 .0538 .0466 • 0465
I 72 .073 .0740 .0650 .0560 .0765 .0660 .0580 •0595
2 64 .086 .0871 .0770 .0668 .0898 .0781 .0689 .070
3 56 .099 . 1002 .0886 .0770 .1033 .0897 .0793 •0785
4 48 .112 .U33 .0998 .0862 .1168 .1010 .0887 .O89
5 44 • 125 .1263 . 1116 .0968 .130 1 .1129 .0995 •0995
6 40 .138 .1394 .1232 .1069 • 1435 .1246 .1097 . no
7 36 •151 .1525 • 1345 .1164 .1569 .1359 .1193 . 120
8 36 .164 .1655 • 1475 .1294 .1699 .1489 .1323 .136
9 32 •177 .1786 .1583 .1380 .1835 .1598 .1411 •
I 4°5
10 30 . 19O .1916 . 1700 .1483 .1968 .1716 .1515 .152
12 28 .216 .2176 • 1944 .1712 .2232 .1961 • 1745 • 173
H 24 .242 .2438 .2167 .1896 .2500 .2184 • I93 1 • 1935
16 22 .268 .2698 .2403 .2108 .2765 .2421 .2144 .213
18 20 •294 .2959 .2634 .2309 .303 1 .2652 • 2346 • 234
20 20 .320 .3219 .2894 .2569 .3291 .2912 .2606 .261
22 18 •346 •
3479 .3118 .2757 •3559 .3^8 .2796 .281
24 16 372 .3740 • 3334 .2928 .3828 •
3354 .2968 .2968
26 16 .398 .4000 •3594 .3188 .4088 .3614 .3228 •323
28 14 .424 .4261 •3797 .3333 •4359 .3818 •3374 •339
30 14 •450 •45 21 •4057 •3593 .4619 .4078 •3634 .368
The pitches for both screws and taps are a function of the
diameter, as expressed by the formula,
6-5
threads per inch =
D + 0.02
and the results are given approximately and in even numbers in
order to avoid the use of fractional or odd number threads.
In this system the form of thread for machine screws
has an included angle of 60 degrees, a truncation or flat at the
top of the thread equal to one-eighth of the pitch and a trunca-
tion at the bottom of the thread equal to one-sixteenth of the
pitch.
The form of thread for taps for machine screws has an in-
cluded angle of 60 degrees, a truncation or flat at the top of the
thread equal to one-sixteenth of the pitch and a truncation or flat
at the bottom of the thread equal to one-eighth of the pitch.
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