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NPTF Thread Specifications
Thread Size Nominal Size
(in)
Number of Threads per Inch Male Thread O.D.
(in)
2 1/8 27 13/32
4 1/4 18 35/64
6 3/8 18 43/64
8 1/2 14 27/32
12 3/4 14 1-1/16
16 1 11.5 1-5/16
20 1-1/4 11.5 n/a
24 1-1/2 11.5 n/a
32 2 11.5 n/a
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