304 Stainless Steel BSP Cross Pipe Fittings — 3-Way & 4-Way, ½" to 1" Thread

BSP sizes refer to the nominal bore of the pipe, not the outer diameter of the thread. As a quick reference: DN15 = ½" BSP (thread OD ≈ 20.9 mm / 0.82"), DN20 = ¾" BSP (thread OD ≈ 26.4 mm / 1.04"), DN25 = 1" BSP (thread OD ≈ 33.2 mm / 1.31"). Measure the male thread OD on your existing pipe or fitting with calipers and match it to the closest BSP nominal size. When in doubt, contact us before ordering.

304 SS BSP threaded fittings typically handle working pressures up to 150 PSI (≈10 bar) at ambient temperature for water and non-aggressive media. Actual ratings depend on pipe wall thickness, installation quality, and the fluid being conveyed. For high-pressure or elevated-temperature applications, contact us to confirm suitability.

Yes. 304 stainless steel offers good corrosion resistance in most outdoor, wet, and humid environments — including garden irrigation systems and exterior plumbing. For highly corrosive settings such as coastal salt-air exposure or chemical-laden environments, 316 stainless steel is generally recommended. In standard outdoor applications, 304 SS performs reliably over the long term.

BSP and NPT threads are not directly interchangeable. While some nominal sizes appear similar in diameter, the thread angle (55° BSP vs. 60° NPT) and pitch differ, which can cause leaks or cross-threading. If you need to connect to an NPT system, use a dedicated BSP-to-NPT adapter fitting. Contact us if you're unsure which standard your existing pipes use.

A 3-way cross (T-shape) has three ports — typically one inlet and two outlets — allowing flow to split in two directions. It's the standard tee fitting used in most branch-line plumbing. A 4-way cross (+ shape) has four ports arranged in a plus sign, allowing flow to split in three directions simultaneously. Choose the 4-way cross when you need to feed three branch lines from a single junction point.

Yes — PTFE thread seal tape (plumber's tape) or a compatible pipe thread sealant compound is recommended for all BSP threaded connections to achieve a leak-free seal. Apply 2–3 wraps of PTFE tape clockwise (in the direction of the thread) on the male threads before assembly. Do not over-tighten; hand-tight plus 1–2 turns with a wrench is generally sufficient for most BSP fittings.

These 304 SS cross fittings are generally suitable for water, compressed air, mild chemicals, and non-corrosive gases. Common applications include residential plumbing, garden and drip irrigation manifolds, compressed air distribution lines, and light industrial fluid systems. For aggressive chemicals, high-purity water, or steam applications, verify media compatibility before installation or contact us for guidance.