Machinery's Handbook, 31st Edition
Taps 989 Table 9. Special Extension Taps ANSI/ASME B94.9-2008 (R2018), Appendix (Tap Dimensions, Ground and Cut Threads) L
I 4
I
I 2
d 1
d
+0.003
1
Nominal Tap Size
Nominal Tap Size
Machine Screw Pipe
Machine Screw
Shank Length I 4
Shank Length I 4
Pipe
Fractional
Fractional
…
0-3
… … … …
0.88 1.00 1.13 1.25 1.38 1.50 1.56 1.63 1.69 1.69 1.88 2.00 2.13 2.25 2.38 2.50 2.63 2.63 2.75 2.88 3.00
… … … 3 … … … … … … … … … … … … … … … … … … … … … … … … … … … 4 … … … … … … … … … …
3.00 3.13 3.13 3.25 3.25 3.38 3.38 3.50 3.50 3.63 3.63 3.75 3.75 3.88 3.88 4.00 4.00 4.13 4.13 4.25 4.25
1 1 ⁄ 2 1 5 ⁄ 8 1 3 ⁄ 4 1 7 ⁄ 8
… 4
…
5-6
… 8
2
… 1 ⁄ 4
10-12
1 ⁄ 16 to 1 ⁄ 4 incl.
14 … … … … … … … … … … … … … … …
… … …
2 1 ⁄ 8 2 1 ⁄ 4 2 3 ⁄ 8 2 1 ⁄ 2 2 5 ⁄ 8 2 3 ⁄ 4 2 7 ⁄ 8
5 ⁄ 16
3 ⁄ 8
3 ⁄ 8 to 1 ⁄ 2 incl.
7 ⁄ 16
… 3 ⁄ 4
1 ⁄ 2
9 ⁄ 16
1
5 ⁄ 8
…
3
11 ⁄ 16
1 1 ⁄ 4 1 1 ⁄ 2
3 1 ⁄ 8 3 1 ⁄ 4 3 3 ⁄ 8 3 1 ⁄ 2 3 5 ⁄ 8 3 3 ⁄ 4 3 7 ⁄ 8
3 ⁄ 4
13 ⁄ 16
… … …
7 ⁄ 8
15 ⁄ 16
1
2
1 1 ⁄ 8 1 1 ⁄ 4 1 3 ⁄ 8
2 1 ⁄ 2
…
4
Tolerances For shank diameter, d 1 for I 4 length
Machine Screw
Pipe, Inch
Tolerances
Fractional, Inch
0 to 14 incl.
1 ⁄ 4 to 5 ⁄ 8 incl.
1 ⁄ 16 to 1 ⁄ 8 incl. 1 ⁄ 4 to 1 incl. 1 1 ⁄ 4 to 4 incl.
- 0.003 - 0.004
… …
11 ⁄ 16 to 1 1 ⁄ 2 incl.
1 5 ⁄ 8 to 4 incl.
- 0.006 Unless otherwise specified, special extension taps will be furnished with dimensions and toler ances as shown for machine screw and fractional taps in Table 5a, Table 5b, and Table 6, and for pipe taps in Table 13a. Exceptions are as follows: Types of centers are optional with manufacturer. Tolerances on shank diameter d 1 and I 4 length as shown on the above Table 9. Shank runout tolerance applies only to the I 4 length shown on the above Table 9.
Copyright 2020, Industrial Press, Inc.
ebooks.industrialpress.com
Made with FlippingBook - Share PDF online