Thread data

BSPP thread chart and dimensions

British parallel pipe thread. The threads do not seal on their own, so a bonded washer, ED ring or O ring seals against the port face. Standard on European and Asian hydraulic pumps, valves and machinery.

Standard: ISO 228-1, ISO 1179
Seals by: Bonded washer or ED seal
Used for: European and Asian hydraulics
Sizes: 1/8 to 3

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BSPP dimensions

The dimensions we machine to. Pressure values are nominal working ratings for steel at room temperature.

Size	Male	Female	Threads per inch	Pitch	Major dia	Pitch dia	Minor dia	Stud thread length	Seal	Tap drill	Rated to
1/8	G1/8 A	G1/8	28	0.907 mm	9.73 mm	9.15 mm	8.57 mm	8.00 mm	ISO 1179 ED or bonded	8.8 mm	5,800 psi
1/4	G1/4 A	G1/4	19	1.337 mm	13.16 mm	12.30 mm	11.45 mm	12.00 mm	ISO 1179 ED or bonded	11.8 mm	5,800 psi
3/8	G3/8 A	G3/8	19	1.337 mm	16.66 mm	15.81 mm	14.95 mm	12.00 mm	ISO 1179 ED or bonded	15.25 mm	5,800 psi
1/2	G1/2 A	G1/2	14	1.814 mm	20.95 mm	19.79 mm	18.63 mm	14.00 mm	ISO 1179 ED or bonded	19 mm	5,800 psi
3/4	G3/4 A	G3/4	14	1.814 mm	26.44 mm	25.28 mm	24.12 mm	16.00 mm	ISO 1179 ED or bonded	24.5 mm	5,800 psi
1	G1 A	G1	11	2.309 mm	33.25 mm	31.77 mm	30.29 mm	18.00 mm	ISO 1179 ED or bonded	30.75 mm	4,568 psi
1 1/4	G1 1/4 A	G1 1/4	11	2.309 mm	41.91 mm	40.43 mm	38.95 mm	20.00 mm	ISO 1179 ED or bonded	39.25 mm	3,625 psi
1 1/2	G1 1/2 A	G1 1/2	11	2.309 mm	47.80 mm	46.32 mm	44.84 mm	22.00 mm	ISO 1179 ED or bonded	45.25 mm	3,625 psi
2	G2 A	G2	11	2.309 mm	59.61 mm	58.14 mm	56.66 mm	24.00 mm	ISO 1179 ED or bonded	57 mm	2,320 psi
2 1/2	G2 1/2 A	G2 1/2	11	2.309 mm	75.18 mm	73.71 mm	72.23 mm	26.00 mm	ISO 1179 ED or bonded	73 mm	1,450 psi
3	G3 A	G3	11	2.309 mm	87.88 mm	86.41 mm	84.93 mm	28.00 mm	ISO 1179 ED or bonded	85.75 mm	1,450 psi

Adapters with BSPP

NPT to BSPP adapters JIC to BSPP adapters ORB to BSPP adapters ORFS to BSPP adapters BSPP to Metric adapters BSPP to DIN 24° adapters BSPT to BSPP adapters BSPP to Hose barb adapters

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