Custom adapters
NPT to BSPP adapters, machined to order
One machined part that connects NPT to BSPP (G) in the exact sizes you need, instead of a stack of off the shelf adapters. Pick the shape, material and finish, see the price as you go, and get it in 2 weeks.
Common sizes
Straight adapters in 303 stainless, priced each at 10 pieces. Any size is available on either end, and you can change the shape, length, bore and material in the builder.
| NPT end | BSPP end | Rated to | Each at 10 | |
|---|---|---|---|---|
| 1/8 NPT male | 1/8 BSPP male | 5,510 psi | $12.93 | Build this |
| 1/4 NPT male | 1/8 BSPP male | 5,510 psi | $14.04 | Build this |
| 1/8 NPT male | 1/4 BSPP male | 5,510 psi | $14.08 | Build this |
| 3/8 NPT male | 3/8 BSPP male | 5,510 psi | $16.34 | Build this |
| 1/2 NPT male | 1/2 BSPP male | 5,510 psi | $18.82 | Build this |
| 3/4 NPT male | 3/4 BSPP male | 4,750 psi | $23.93 | Build this |
| 1 NPT male | 1 BSPP male | 4,330 psi | $36.08 | Build this |
| 1 1/4 NPT male | 1 1/4 BSPP male | 2,850 psi | $51.50 | Build this |
| 1 1/2 NPT male | 1 1/2 BSPP male | 2,850 psi | $65.46 | Build this |
Ratings are for 303 stainless at room temperature, limited by the lower rated end. Single parts start at $120.
About NPT
American tapered pipe thread. The taper wedges tight and seals on the thread flanks with sealant or PTFE tape. Found on pumps, compressors, gauges, valves and general plumbing across North America.
ASME B1.20.1. Seals by: taper, sealant or ptfe tape.
About BSPP
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.
ISO 228-1, ISO 1179. Seals by: bonded washer or ed seal.
One part, fewer leaks
A single machined adapter replaces a stack of two or three, so there are fewer joints to leak and the run is shorter and lighter.
Any shape
Straight, 45°, 90°, street 90, tee, Y, cross or a manifold with up to 8 outlets. Stainless, steel, brass, aluminum or engineering plastics.
Checked before it ships
Threads are checked with go and no-go gauges and every order ships with a certificate of conformance. Pressure test reports on request.
Questions
What pressure is an NPT to BSPP adapter rated for?
It depends on the size and material. In 303 stainless, the common sizes on this page are rated from 2,850 to 5,510 psi, set by the lower rated end. The builder shows the exact rating for your part, including a wall thickness check.
Can I get an NPT to BSPP adapter as an elbow or tee?
Yes. Choose straight, 45°, 90°, street 90, tee, cross or a manifold, then set the length, bore, material and finish. The price and pressure rating update as you design.
How many do I have to order?
There is no minimum. Single parts start at $120, pairs at $55 each, and the price per part drops as quantity goes up.
How fast will it ship?
Standard orders ship in 2 weeks. 1 week and 3 day delivery are available. Every thread is gauged, and every order ships with a certificate of conformance.
Related adapters
Need a size or shape not listed?
Every combination of 24 standards is available in the builder.
Open the builder