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Parts ranked by threads per inch / pitch

28

1/8" BSP parallel (G1/8 / BSPP) has the highest threads per inch / pitch in the dataset, at 28.

Which part has the highest threads per inch / pitch?

1/8" BSP parallel (G1/8 / BSPP), at 28, tops the 31 parts we hold a published threads per inch / pitch for. The full ranking is below.

#	Parts	Threads per inch / pitch
1	1/8" BSP parallel (G1/8 / BSPP)	28
2	1/8" NPT (National Pipe Taper)	27
3	Male aerator thread (M22 x 1 / 15/16"-27)	27
4	Female aerator thread (M24 x 1 / 55/64"-27)	27
5	1/4" BSP parallel (G1/4 / BSPP)	19
6	3/8" BSP parallel (G3/8 / BSPP)	19
7	1/4" BSP tapered (R1/4 / BSPT)	19
8	3/8" BSP tapered (R3/8 / BSPT)	19
9	1/4" NPT (National Pipe Taper)	18
10	3/8" NPT (National Pipe Taper)	18
11	3/4" NPSH straight hose thread	14
12	1/2" BSP parallel (G1/2 / BSPP)	14
13	3/4" BSP parallel (G3/4 / BSPP)	14
14	1/2" BSP tapered (R1/2 / BSPT)	14
15	3/4" BSP tapered (R3/4 / BSPT)	14
16	1/2" NPT (National Pipe Taper)	14
17	3/4" NPT (National Pipe Taper)	14
18	Garden Hose Thread (GHT / NH)	11.5
19	1" NPSH straight hose thread	11.5
20	1" NPT (National Pipe Taper)	11.5
21	1" BSP parallel (G1 / BSPP)	11
22	1-1/4" BSP parallel (G1-1/4 / BSPP)	11
23	1-1/2" BSP parallel (G1-1/2 / BSPP)	11
24	1" BSP tapered (R1 / BSPT)	11
25	1-1/2" NH fire hose thread (NST)	9
26	2-1/2" NH fire hose thread (NST)	7.5
27	S60x6 IBC buttress thread	6 mm pitch
28	M22 x 1.5 pressure-washer, 14 mm bore	1.5 mm pitch
29	M22 x 1.5 pressure-washer, 15 mm bore	1.5 mm pitch
30	Male aerator thread (M18 x 1)	1 mm pitch
31	Female aerator thread (M22 x 1)	1 mm pitch

Data as of 2026-09-05.

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