Stainless Steel Hex Nipple BSP Pipe Fitting — Male Thread Adapter 1/4" to 1-1/4"

Measure the inner diameter of your pipe or fitting port. BSP sizes are nominal — a 1/2" BSP fitting typically has an actual thread OD of around 20.9mm (≈0.82"). For reducer nipples, match the larger end to your existing pipe and the smaller end to the component you're connecting. When in doubt, check your system's thread gauge or contact us to confirm the right fit.

Stainless steel BSP hex nipples generally handle working pressures up to 150 PSI or higher depending on size and wall thickness. Thickened variants are typically rated for higher-pressure applications such as compressed air line fittings. Always verify the pressure rating against your system specifications before installation.

Yes. Stainless steel offers strong corrosion resistance and is generally suitable for outdoor plumbing fittings, irrigation system adapters, and wet-environment installations. For highly saline or aggressive chemical environments, 316 stainless is typically preferred over 304. Contact us to confirm the specific grade available for your application.

These are BSP (British Standard Pipe) male thread fittings. BSP uses a 55° thread angle; NPT uses 60°. They are not directly interchangeable. In some cases a BSP fitting may partially engage an NPT port, but this will not produce a reliable, leak-free seal. If your system uses NPT threads, please verify compatibility before ordering.

Yes, in most cases. BSPT (tapered) threads generally require PTFE tape or a thread sealant compound applied to the male threads for a leak-free seal. BSPP (parallel) threads typically rely on a sealing washer or O-ring at the mating face rather than thread sealant alone. Apply sealant per your system's requirements and local plumbing code.

A hex nipple is a short double-ended male-threaded fitting with a hexagonal body for wrench grip. Use a straight hex nipple to join two female-threaded ports of the same BSP size. Use a reducer hex nipple (e.g., 1/2" to 3/4" BSP) to connect ports of different sizes in a single compact fitting, eliminating the need for a separate bushing or coupling.

You typically need two adjustable wrenches or open-end wrenches — one to hold the hex body of the nipple and one to tighten the mating fitting. The hex body design makes installation straightforward without specialized pipe tools. Avoid over-tightening, which can damage threads or cause stress cracking in the fitting body.