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NPT End Fitting

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Nominal Size Walther Code Thread Size (inch) Pitch (threads per inch)
Male Female OD ID
1/8" NP010 NP510 0.405 0.342 27
1/4" NP013 NP513 0.540 0.444 18
3/8" NP017 NP517 0.675 0.579 18
1/2" NP021 NP521 0.840 0.717 14
3/4" NP026 NP526 1.050 0.929 14
1" NP033 NP533 1.315 1.163 11-1/2
1-1/4" NP042 NP542 1.660 1.508 11-1/2
1-1/2" NP048 NP548 1.900 1.747 11-1/2
2" NP060 NP560 2.375 2.210 11-1/2
2-1/2" NP075 NP575 2.875 2.654 8
3 NP088 NP588 3.500 3.280 8
3-1/2" NP100 NP600 4.000 3.781 8
4 NP113 NP613 4.500 4.279 8
5 NP138 NP638 5.563 5.341 8
6 NP164 NP664 6.625 6.398 8

Walther code is NP for NPT, 0 or 1 for male thread, 5 or 6 for female, followed by the actual (not nominal) thread OD in mm.

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