BSP Threaded Stainless Steel Pipe Fittings 304 — Elbow, Tee, Nipple, Socket & More

BSP sizes refer to the nominal bore of the pipe, not the actual thread outer diameter. A 1/2" BSP fitting (DN15) typically has a thread OD of approximately 20.9mm (≈0.82"), while a 3/4" BSP (DN20) is approximately 26.4mm (≈1.04"). Always measure your existing pipe thread OD with calipers, or check your system's nominal bore rating, before selecting a size. When in doubt, contact us with your measurements.

BSPP (British Standard Pipe Parallel, also called G thread) has straight, parallel threads and seals via a washer or O-ring at the face. BSPT (British Standard Pipe Taper) has tapered threads that seal by thread interference. These fittings use BSPP (parallel) threads in most configurations. Confirm your system's thread type before ordering to ensure a leak-free connection.

Yes. 304 stainless steel generally offers good corrosion resistance in outdoor and wet environments, including rain, humidity, and mild chemical exposure. For highly corrosive environments — such as saltwater, chlorinated pools, or aggressive chemical systems — 316 stainless steel is typically recommended. If you are unsure, contact us to confirm suitability for your specific environment.

304 stainless steel BSP threaded fittings in 1/2" and 3/4" sizes typically handle working pressures up to approximately 150 PSI (≈10 bar) for water and general fluid applications under normal conditions. Actual pressure ratings depend on the specific fitting type, wall thickness, temperature, and the fluid or gas being conveyed. Contact us to confirm the rating for your specific application before use in high-pressure systems.

No. BSP and NPT are different thread standards and are not directly interchangeable. BSP threads have a 55° thread angle while NPT uses 60°, and the thread pitches differ. Attempting to connect BSP fittings to NPT ports can result in leaks or thread damage. If you need to connect a BSP system to an NPT system, BSP-to-NPT adapters are available — contact us for guidance.

For BSPP (parallel) fittings, a bonded seal washer or O-ring at the face is the standard sealing method. PTFE tape can be used as a supplementary measure on the threads. For BSPT (tapered) fittings, PTFE tape applied to the male thread in the direction of the thread is the common practice. Always follow the sealant manufacturer's guidelines and your local plumbing code requirements.

Male (M) ends have external threads; Female (F) ends have internal threads. Select based on the thread type on your existing pipe or fitting. For example, if your pipe has an external (male) thread, you need a Female port on the fitting to receive it. Mixed M&F variants allow you to connect pipes with different thread genders in a single fitting, eliminating the need for an additional adapter in many cases.