Wednesday, October20, 2021
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Pipe Threads


American Standard Taper Pipe Threads (NPT)

Nominal Size
(ID)
Actual
OD
Close
Fraction
Threads
per inch
Length of
engagement
(hand tight)
Hand tight
turns
Wrench
make up
turns
Length of
effective
thread
1/16 0.3125 5/16 27 0.16     0.2611
1/8 0.405 13/32 27 0.18 4 1/2 2 1/2 0.26
1/4 0.54 17/32 18 0.2 4 3 0.401
3/8 0.675 11/16 18 0.24 4 1/2 3 0.408
1/2 0.84 13/16 14 0.32 4 1/2 3 0.534
3/4 1.05 1 1/16 14 0.34 4 1/2 3 0.546
1 1.315 1 3/16 1 1.5 0.4 4 1/2 3 1/4 0.682
1 1/4 1.66 1 5/8 11.5 0.42 4 1/2 3 1/4 0.707
11/2 1.9 1 7/8 11.5 0.42 4 1/2 3 1/4 0.724
2 2.375 2 3/8 11.5 0.436 5 3 0.756
2 1/2 2.875 2 7/8 8 0.682 5 1/2 3 1.136
3 3.5 3 1/2 8 0.766 6 3 1.2
3 1/2 4 4 8 0.821 6 1/2 3 1/2 1.25
4 4.5 4 1/2 8 0.844 6 3/4 3 1/2 1.3
5 5.563 5 1/2 8 0.937 7 1/2 3 3/4 1.4063


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