Straight & Taper Pipe Taps Standards & Dimensions General Dimensions (USCTI Table 311)
Dimensions (Inch)
Nominal Size (Inch)
Size of Square E
Overall Length A
Thread Length B
Length of Square C
Shank Diameter D
1/16
2-1/8 2-1/8 2-1/8
11/16
3/8 3/8 3/8 1/2 5/8 7/16
0.3125 0.3125 0.4375 0.5625 0.7000 0.6875 0.9063 1.1250 1.3125 1.5000 1.8750
0.234 0.234 0.328 0.421 0.531 0.515 0.679 0.843 0.984 1.125 1.406
1/8 1/8 1/4 3/8 1/2 3/4
3/4 3/4
2-7/16 2-9/16
1-1/16 1-1/16
3-1/8 3-1/4 3-3/4 4-1/4 4-1/2 4
1-3/8 1-3/8 1-3/4 1-3/4 1-3/4 1-3/4
11/16 13/16 15/16
1
1-1/4 1-1/2
1
2
1-1/8
Tolerances
Tolerance (Inch)
Range (Inch)
Element
Direction
Cut Thread
Ground Thread
1/16 to 3/4 incl.
Plus or Minus Plus or Minus Plus or Minus Plus or Minus Plus or Minus Plus or Minus Plus or Minus
1/32 1/16 1/16 3/32 1/32 1/16 1/8
1/32 1/16 1/16 3/32 1/32 1/16 1/8
Overall Length-A
1 to 4 incl.
1/16 to 3/4 incl. 1 to 1-1/4 incl. 1-1/2 to 4 incl. 1/16 to 3/4 incl. 1/16 to 1/8 incl. 1/4 to 1/2 incl. 1 to 4 incl. 3/4 to 1 incl. 1-1/4 to 4 incl. 1/16 to 1/8 incl. 1/4 to 3/4 incl.
Thread Length-B
Length of Square-C
Minus Minus Minus Minus Minus Minus Minus
0.0070 0.0070 0.0090 0.0090 0.0040 0.0060 0.0080
0.0015 0.0020 0.0020 0.0030 0.0040 0.0060 0.0080
Shank Diameter-D
Size of Square-E
1 to 4 incl.
Thread Limits
*Gage Measurement (inch)
Taper per Foot (inch)
Threads per Inch NPT
Nominal Size (inch)
Tolerance (+/-)
Cut Thread
Ground Thread
Projection
Ground Thread
Cut Thread
Min.
Max. 27/32 27/32 27/32 27/32 13/16 13/16 13/16 13/16 13/16 13/16
Min.
Max. 25/32 25/32 25/32 25/32 25/32 25/32 25/32 25/32 25/32 25/32
1/16
27 27 18 18 14 14
.312 .312 .459 .454 .579 .565 .678 .686 .699 .667
1/16 1/16 1/16 1/16 1/16 1/16 3/32 3/32 3/32 3/32
1/16 1/16 1/16 1/16 1/16 1/16 3/32 3/32 3/32 3/32
23/32 23/32 23/32 23/32 23/32 23/32 23/32 23/32 23/32 23/32
23/32 23/32 23/32 23/32 23/32 23/32 23/32 23/32 23/32 23/32
1/8 1/4 3/8 1/2 3/4
1
11-1/2 11-1/2 11-1/2 11-1/2
1-1/4 1-1/2
2
*Distance small end of tap projects through American Standard Pipe Thread Ring Gage.
Threading Technical
776
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