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 flank angle is 60°, the profile was originated by William Sellers.

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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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