BSP Brass Reducing Hexagon Bush — Male to Female Thread Fittings (1/4" to 1")

Identify the male (larger) thread on your pipe or fitting and the female (smaller) port you need to connect to. BSP sizes are nominal bore sizes — not actual thread diameters. For reference, a 1/2" BSP male thread measures approximately 20.9 mm (≈0.825") across the thread OD. Always verify with a thread gauge or caliper before ordering. Available combinations on this listing range from 1/4"M–1/8"F up to 1"M–3/4"F.

These fittings use BSP (British Standard Pipe) threads, also referred to as BSPP (parallel) or G-thread. BSP is widely used in plumbing, pneumatic, and hydraulic systems across the US, UK, Europe, and Asia. BSP threads are not directly compatible with NPT (National Pipe Taper) threads — the thread angle and pitch differ. A dedicated BSP-to-NPT adapter is required if connecting to NPT fittings.

Brass generally offers good corrosion resistance to water, moisture, and mild chemicals, making it suitable for outdoor plumbing, garden irrigation, and exposed pipe runs in most cases. For highly corrosive environments — such as saltwater exposure or aggressive chemical contact — stainless steel fittings are typically recommended. Brass is not suitable for use with ammonia-based fluids.

Brass BSP reducing bushes of this type are generally rated for low-to-medium pressure systems. Working pressure typically ranges from 150 PSI to 600 PSI depending on size, wall thickness, and application conditions. Larger sizes generally have lower pressure ratings. Contact us to confirm suitability for your specific pressure and temperature requirements before use in critical systems.

The correct sealing method depends on your thread type. For BSPP (parallel) threads, a sealing washer or O-ring at the seating face is typically used — PTFE tape on the threads alone is generally not sufficient for a pressure-tight seal. For BSPT (tapered) threads, PTFE tape or thread sealant compound applied to the male threads is the standard approach. Always follow the sealing method appropriate for your thread type and system pressure.

The hex body is designed for use with a standard open-end wrench or adjustable wrench sized to the hex flat of the fitting. Hand-tighten first to ensure threads are properly engaged, then snug with a wrench. Avoid overtightening, which can crack the fitting or damage the mating port. Do not use a pipe wrench directly on the hex body.

Brass fittings are commonly used in natural gas and propane systems in many regions; however, suitability depends on local plumbing and gas codes, the specific gas type, operating pressure, and the fitting grade. Always verify compliance with applicable local codes before installing any fitting on a gas line. Contact us if you need additional product documentation.

You can select the quantity directly from the variant options: 1, 2, 5, 10, 20, or 50 pieces per order. Larger quantity variants are priced at a lower per-unit cost, making them ideal for trade use, maintenance stock, or multi-point installations. If you need quantities beyond 50 or custom configurations, contact us for a quote.