Stainless Steel Cross 4-Way Pipe Fitting | BSP Female Thread | 1/4" to 2"

BSP sizes refer to the nominal bore of the pipe, not the actual thread outer diameter. For reference: 1/4" BSP thread OD is approximately 13.2 mm (≈0.52"), 1/2" BSP is approximately 20.9 mm (≈0.82"), and 1" BSP is approximately 33.2 mm (≈1.31"). Measure the thread OD of your existing male fitting and match it to a BSP nominal size chart. When in doubt, bring the existing fitting to a hardware store for a thread gauge check.

Stainless steel BSP cross fittings generally support working pressures in the range of 150–1,000 PSI, depending on size and wall thickness. Smaller sizes (DN8–DN15) typically handle higher pressures than larger sizes (DN40–DN50). Contact us to confirm the rated pressure for your specific size before use in high-pressure or safety-critical systems.

Yes, stainless steel offers strong resistance to rust and oxidation in outdoor and damp environments. For saltwater or coastal marine applications, 316 stainless is generally preferred over 304 due to its higher molybdenum content. Please contact us to confirm the specific grade if your application requires marine-grade corrosion resistance.

These fittings use BSP parallel female threads (BSPP / G-thread) per ISO 228. BSP and NPT threads are not interchangeable — NPT is a tapered thread while BSPP is parallel. If your existing system uses NPT fittings, you will need a BSP-to-NPT adapter. Always verify your thread standard before ordering.

Stainless steel cross fittings are commonly used in water supply, compressed air distribution, and low-pressure gas systems. Suitability depends on the specific fluid, operating pressure, and temperature of your application. Always use appropriate thread sealant (PTFE tape or thread compound rated for your media) and verify compatibility with local codes and system requirements.

Yes. BSPP (parallel) threads do not seal on the thread form alone — a sealing washer, O-ring face seal, or PTFE thread tape is typically required for a leak-free connection. We recommend wrapping PTFE tape clockwise (when facing the thread end) 2–3 times around the male thread before assembly. For gas applications, use a thread compound rated for gas service.

DN (Diameter Nominal) is the metric nominal bore designation used alongside the BSP inch size. They describe the same nominal pipe bore: DN8 = 1/4" BSP, DN10 = 3/8" BSP, DN15 = 1/2" BSP, DN20 = 3/4" BSP, DN25 = 1" BSP, DN32 = 1-1/4" BSP, DN40 = 1-1/2" BSP, DN50 = 2" BSP. Use whichever designation matches your existing pipe documentation.