A2 Stainless Steel BSP Male to Male Hex Nipple Pipe Fittings

Match the nipple thread size to your existing pipe or fitting thread. BSP sizes are measured by nominal bore, not outer diameter — for example, a 1/2" BSP nipple typically has an outer diameter of around 21mm (≈13/16"). Always verify with a thread gauge or caliper before ordering. For reducer nipples, select the larger end to match your supply pipe and the smaller end to match your outlet fitting.

A2 (304) stainless steel BSP hex nipples are generally rated for working pressures up to 150 PSI in standard plumbing and fluid-transfer applications, though actual ratings depend on pipe schedule, temperature, and the connected system. For high-pressure or steam applications, consult your system specifications and confirm with us before ordering.

A2 stainless steel (equivalent to 304 grade) offers good corrosion resistance in most outdoor and mildly corrosive environments. It is generally suitable for garden irrigation, outdoor plumbing, and light marine use. For highly saline or chloride-rich environments, A4 (316) grade is typically recommended for longer service life.

These fittings use BSP (British Standard Pipe) threads, which are parallel (BSPP / G-thread). BSP and NPT threads are not directly interchangeable — NPT is tapered while BSPP is parallel, and the thread angles differ (55° vs 60°). Mixing the two without an adapter can cause leaks. If your system uses NPT fittings, please contact us to confirm compatibility before ordering.

Yes. BSPP (parallel) threads rely on a face seal or O-ring for a pressure-tight connection, but applying PTFE thread tape or a suitable thread sealant compound is generally recommended as an additional precaution, especially in pressurized water or gas lines. Always follow the requirements of your specific application.

Choose a same-size nipple (e.g., 1/2" to 1/2") when connecting two pipes or fittings of identical thread size. Choose a reducer nipple (e.g., 1/2" to 3/4") when you need to step up or step down between two different pipe sizes in a single fitting, eliminating the need for a separate reducer coupling.

The hex (hexagonal) body provides flat wrench flats on both sides of the nipple, allowing you to grip and torque the fitting securely with a standard open-end or adjustable wrench without damaging the threads or the connected pipe. This is especially useful in tight spaces where a pipe wrench cannot be positioned easily.