Machinery's Handbook, 31st Edition
1010
Acme and Square-Threaded Taps Table 27. Dimensions of Acme Threads Taps in Sets of Three Taps A
B
C
1ST TAP IN SET ROOT DIA. –0.010 "
D
E
2ND TAP IN SET ROOT DIA. –0.010 "
F
G
K
FINISHING TAP
H
I
Nominal Dia.
A B C D E
F
G H I
K
0.520 0.582 0.645 0.707 0.832 0.895 0.957 1.020 1.270 1.395 1.520 1.645 1.770 1.895 2.020 2.270 2.520 2.770 3.020
4 4 5 6 6 6 7 7 8 9 9
1 2 2 2 2 2 3 3 3 3 3 4 4 4 4 5 5 5
2 2 3 3 3 4 4 4 4 5 5 6 6 6 6 7 7 8 8
1 2 2 2 3 3 3 3 3 4 4 4 4 5 5 5 5 6 6 7 7
1 2 2 2 2 3 3 3 3 3 3 4 4 4 4 4 5 5 5 6 6
1 1 2 2 2 2 2 2 3 3 3 3 3 3 4 4 4 4 5 5 5
1 ⁄ 9 ⁄ 5 ⁄
1 ⁄ 7 ⁄ 1 ⁄ 1 ⁄ 7 ⁄ 1 ⁄ 9 ⁄
7 ⁄ 1 ⁄ 3 ⁄ 1 ⁄
3 ⁄ 3 ⁄ 1 ⁄ 1 ⁄
1 ⁄ 9 ⁄ 5 ⁄
7 ⁄ 3 ⁄ 1 ⁄
5 ⁄ 3 ⁄ 7 ⁄
3 ⁄
7 ⁄ 1
1 ⁄ 3 ⁄
2
4 8
8
8 4 8 2
2
8
8 4 8
4
8
2
16
8 8 2
16
16
4
1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 3
1 ⁄ 9 ⁄
1 ⁄ 1 ⁄ 3 ⁄ 7 ⁄ 1 ⁄ 9 ⁄ 5 ⁄ 3 ⁄ 7 ⁄ 1 ⁄ 1 ⁄ 1 ⁄ 1 ⁄ 3 ⁄ 1 ⁄ 5 ⁄ 3 ⁄
8
2
8
2
4
8 4
3
11 ⁄
13 ⁄
13 ⁄
15 ⁄
1 ⁄ 7 ⁄
16
16
16
16
16
4
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2
16 0.770
3 ⁄
11 ⁄ 13 ⁄
13 ⁄
11 ⁄
1 ⁄ 5 ⁄ 1 ⁄ 5 ⁄
13 ⁄
4
2
16 16
16
16
8
16
8
4
13 ⁄
1 ⁄ 1 ⁄ 7 ⁄ 5 ⁄
3 ⁄ 3 ⁄
1 ⁄ 1 ⁄ 3 ⁄ 1 ⁄ 5 ⁄ 3 ⁄ 7 ⁄ 1 ⁄ 1 ⁄ 9 ⁄ 9 ⁄ 5 ⁄ 3 ⁄ 7 ⁄
5 ⁄
16
8 4
16
4 4
16
16
16
8
7 ⁄
1 ⁄ 1 ⁄ 3 ⁄ 5 ⁄ 7 ⁄ 1 ⁄ 1 ⁄ 1 ⁄
3 ⁄ 7 ⁄
8
4
2 8
8
8 4
2
4 8
15 ⁄
1 ⁄ 1 ⁄ 9 ⁄ 3 ⁄ 1 ⁄ 1 ⁄ 3 ⁄ 7 ⁄ 1 ⁄ 1 ⁄ 3 ⁄
13 ⁄ 13 ⁄
16
16
8 4
16
16 16
16
16
1
7 7 ⁄
13 ⁄
8
8
16
4
8 8
8 4 8 8 8 4 4 8 2 8 4
16 1.145
1 1 ⁄ 1 1 ⁄ 1 3 ⁄ 1 1 ⁄ 1 5 ⁄ 1 3 ⁄ 1 7 ⁄ 2 1 ⁄ 2 1 ⁄ 2 3 ⁄ 2
1 ⁄
15 ⁄
7 ⁄
1 ⁄ 5 ⁄ 1 ⁄ 3 ⁄ 3 ⁄ 7 ⁄ 5 ⁄ 1 ⁄ 9 ⁄
3 ⁄ 3 ⁄ 1 ⁄ 5 ⁄ 7 ⁄ 1 ⁄ 3 ⁄ 3 ⁄ 1 ⁄ 1 ⁄ 3 ⁄
8 4 8 2 8 4 8
2
16
16
8
16 16
16
5
1 ⁄ 1 ⁄ 3 ⁄ 1 ⁄ 1 ⁄ 3 ⁄ 1 ⁄ 3 ⁄ 1 ⁄ 3 ⁄
15 ⁄
4
4 2
16
8
8
8 2 8 8 4 8 4 8 2 4
1 1 1 1 1 1 1 1 1 1
1 ⁄
2
2
16
16
10 4
4 2 4 8
4
4
2 2
4 2
10 11 11 12 13
1 ⁄
2
1 ⁄ 1 ⁄ 1 ⁄ 1 ⁄ 3 ⁄ 1 ⁄ 1 ⁄
11 ⁄ 15 ⁄
4 2 4 4 4 4 4
16 16
16 16
16 16
16 16
3 ⁄
8 4
11 3 ⁄
1 ⁄ 1 ⁄ 7 ⁄ 1 ⁄ 3 ⁄
8 8
8 8
8
8 2
1 ⁄ 1 ⁄
4 2
2 4
4 2
16
4 4 4
16
8
8 4 4
14 5
4
4
3
15 6 1 ⁄ 4
1 ⁄
2
Diameters of General-Purpose Acme Screw Threads of Classes 2G, 3G, and 4G may be calculated from pitch = 1/number of threads per inch, and: minimum diameter = basic major diameter – pitch maximum diameter = minimum minor diameter + 0.05 × pitch
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