NPSL Pipe Thread ANSI B 1.20.1-1983 (R1992)

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

Nominal Diameter Major Diameter
mm		 Major Diameter
Inch		 Tapping
Drill Size
mm		 TPI Pitch
mm
1/8" - 27 NPSL 10,287 0,405 10,389 27 0,941
1/4" - 18 NPSL 13,716 0,540 13,741 18 1,411
3/8" - 18 NPSL 17,145 0,675 17,221 18 1,411
1/2" - 14 NPSL 21,336 0,840 21,438 14 1,814
3/4" - 14 NPSL 26,670 1,050 26,772 14 1,814
1" - 11 1/2 NPSL 33,401 1,315 33,477 11,5 2,209
1 1/4" - 11 1/2 NPSL 42,164 1,660 42,240 11,5 2,209
1 1/2" - 11 1/2 NPSL 48,260 1,900 48,311 11,5 2,209
2" - 11 1/2 NPSL 60,325 2,375 60,350 11,5 2,209
2 1/2" - 8 NPSL 73,025 2,875 73,076 8 3,175
3" - 8 NPSL 88,900 3,500 88,976 8 3,175
3 1/2" - 8 NPSL 101,600 4,000 101,676 8 3,175
4" - 8 NPSL 114,300 4,500 114,351 8 3,175
5" - 8 NPSL 141,300 5,563 141,326 8 3,175
6" - 8 NPSL 168,275 6,625 168,148 8 3,175
8" - 8 NPSL 219,075 8,625 218,821 8 3,175
10" - 8 NPSL 273,050 10,750 272,669 8 3,175
12" - 8 NPSL 323,850 12,750 323,393 8 3,175

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