National Pipe Thread Chart

National Pipe Thread Chart

NPT or National Pipe Thread is an American thread type commonly used in a variety of hydraulic and industrial applications. The most recognizable characteristic of NPT are tapered threads, and due to the metal-to-metal sealing method of NPT thread sealant is required in order to achieve a leak free connection.

 

Inch  Dash Size Nominal Thread Size Male  Female
Fraction Numeric Fraction-Threads Per Inch O.D. I.D.
1/8 2 1/8-27 .41 .38
1/4 4 1/4-18 .54 .49
3/8 6 3/8-18 .68 .63
1/2 8 1/2-14 .84 .77
3/4 12 3/4-14 1.05 .98
1 16 1-11 1/2 1.32 1.24
1-1/4 20 1 1/4 - 11 1/2 1.66 1.58
1-1/2 24 1 1/2 - 11 1/2 1.90 1.82
2 32 2-11 1/2 2.38 2.30
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