Specifications of International Thread Standards

Parallel pipe thread for mechanical joints and lock nuts with loose for not self-sealing joints. (National Pipe Straight Loose). The flank angle is 60°, the profile was originated by William Sellers.

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Nominal DiameterMajor Diameter
mm
Major Diameter
Inch
Tapping
Drill Size
mm
TPIPitch
mm
1/8" - 27 NPSL10,2870,40510,389270,941
1/4" - 18 NPSL13,7160,54013,741181,411
3/8" - 18 NPSL17,1450,67517,221181,411
1/2" - 14 NPSL21,3360,84021,438141,814
3/4" - 14 NPSL26,6701,05026,772141,814
1" - 11 1/2 NPSL33,4011,31533,47711,52,209
1 1/4" - 11 1/2 NPSL42,1641,66042,24011,52,209
1 1/2" - 11 1/2 NPSL48,2601,90048,31111,52,209
2" - 11 1/2 NPSL60,3252,37560,35011,52,209
2 1/2" - 8 NPSL73,0252,87573,07683,175
3" - 8 NPSL88,9003,50088,97683,175
3 1/2" - 8 NPSL101,6004,000101,67683,175
4" - 8 NPSL114,3004,500114,35183,175
5" - 8 NPSL141,3005,563141,32683,175
6" - 8 NPSL168,2756,625168,14883,175
8" - 8 NPSL219,0758,625218,82183,175
10" - 8 NPSL273,05010,750272,66983,175
12" - 8 NPSL323,85012,750323,39383,175
NPSL

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