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Pipe Tap Dimensions (Straight and Taper)<br />
Table 311<br />
Nominal<br />
Standard<br />
Projection*<br />
Standard<br />
Overall<br />
Length<br />
A<br />
Extension<br />
Overall<br />
Length<br />
†<br />
Length<br />
of<br />
Thread<br />
B<br />
Length of<br />
Square<br />
C<br />
Shank<br />
Diameter<br />
D<br />
Size of<br />
Square<br />
E<br />
1/16" 0.312 2.1/8" 4" & 6" 11/16" 3/8" 0.3125 0.234<br />
1/8" ** 0.312 2.1/8" -- 3/4" 3/8" 0.3125 0.234<br />
1/8" 0.312 2.1/8" 4", 6", 8",10",12" 3/4" 3/8" 0.4375 0.328<br />
1/4" 0.459 2.7/16" 4", 6", 8",10",12" 1.1/16" 7/16" 0.5625 0.421<br />
3/8" 0.454 2.9/16" 6", 8",12" 1.1/16" 1/2" 0.7000 0.531<br />
1/2" 0.579 3.1/8" 6", 8",12" 1.3/8" 5/8" 0.6875 0.515<br />
3/4" 0.565 3.1/4" 6", 8",12" 1.3/8" 11/16" 0.9093 0.679<br />
1" 0.678 3.3/4" 6" & 10" 1.3/4" 13/16" 0.9093 0.843<br />
1.1/4" 0.686 4" -- 1.3/4" 15/16" 1.3125 0.984<br />
1.1/2" 0.699 4.1/4" -- 1.3/4" 1" 1.5000 1.125<br />
2" 0.667 4.1/2" -- 1.3/4" 1.1/8" 1.8750 1.406<br />
2.1/2" 0.925 5.1/2" -- 2.9/16" 1.1/4" 2.2500 1.687<br />
3" 0.925 6" -- 2.5/8" 1.3/8" 2.6250 1.968<br />
3.1/2" 0.938 6.1/2" -- 2.11/16" 1.1/2" 2.8125 2.108<br />
4" 0.950 6.3/4" -- 2.3/4" 1.5/8" 3.0000 2.250<br />
† Refer to Table 303-A for shank "T" dimensions and tolerances<br />
* Distance small end of tap projects through L1 Taper Thread Ring Gauge<br />
V 1.0 – November 2011 Page 65
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