Stainless Steel BSP Pipe Fittings — Plug, Nipple, Elbow, T-Piece & More (1/8" to 4")

BSP (British Standard Pipe) sizes refer to the nominal bore of the pipe, not the actual thread diameter. For example, a 1/2" BSP fitting has an actual thread OD of approximately 20.9mm (≈0.82"). Measure the OD of your existing male thread or the ID of your female port, then match it to the BSP nominal size chart. When in doubt, size up — a slightly larger fitting is easier to adapt than one that is too small.

Yes. These fittings are made from stainless steel, which generally offers strong resistance to rust and corrosion in outdoor, humid, and mildly saline environments. For full marine or coastal exposure, we recommend confirming the grade (typically 304 or 316) before installation, as 316 stainless provides superior chloride resistance.

Pressure ratings vary by fitting type and size. Stainless steel BSP fittings generally handle working pressures in the range of 150–3000 PSI depending on wall thickness and configuration. Smaller sizes typically support higher pressures. Please contact us to confirm the rating for your specific fitting and application.

No — BSP (British Standard Pipe) and NPT (National Pipe Taper) threads are not directly interchangeable. BSP threads have a 55° thread angle while NPT uses 60°. Mixing them can result in leaks or cross-threading. Always confirm your existing system uses BSP threads before ordering.

Choose based on your plumbing need:

• Hexagon Socket Plug — cap off an open port
• Equal Nipple / Equal Socket — extend or join same-size pipes
• Reducing Bush / Reducing Nipple / Reducing Sleeve — connect different pipe sizes
• Straight — inline male-to-female connection
• T-Piece — create a branch connection in a run
• Angle 90° / 45° — change pipe direction in tight spaces
• Pipe Double Nipple — fixed-length male-threaded extension

Yes, in most cases PTFE tape (thread seal tape) or a liquid pipe sealant is recommended for BSP parallel (BSPP) threads to ensure a leak-free seal. BSP taper (BSPT) threads can self-seal under pressure but still benefit from sealant. Always wrap male threads with 2–3 layers of PTFE tape before assembly.

Stainless steel BSP fittings are generally compatible with gas applications when properly sealed and rated for the operating pressure. However, gas installations are subject to local codes and regulations. Always consult a licensed plumber or gas fitter and verify the fitting's pressure rating before use in gas systems.