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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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