ISO 228 / ISO 7 British Standard Pipe Threads — BSPP (G) / BSPT (R) Dimensions 1/16 – 6 (mm)

Documents

Shipments are backed by Mill Test Certificate (MTC), Dimensional Report, Salt Spray Test Report on request, with full batch traceability from raw material to finished product. Quality management follows the owner-confirmed compliance list: ISO 9001:2015, RoHS, REACH. Exact document sets are confirmed on the order.

Quotation

• The fastener family (ISO 228 / ISO 7 British Standard Pipe Threads — BSPP (G) / BSPT (R) Dimensions 1/16 – 6 (mm)) plus the standard designation from your drawing — DIN / ISO / JIS / ASTM / ANSI, or a drawing for custom parts.
• Size (diameter and length), thread type (metric or inch), property class or grade, and coating or finish.
• Quantity per size and your target delivery date.
• Destination country, and any required documents (for example a mill test certificate) so the quote includes them.

Sample & supply

Minimum order quantity is 10,000 pieces. Stock items run 3–7 days. Quantities or variants outside the standard range are confirmed at quotation.

Storage & shipping

Parts are packed for export and shipped factory-direct to buyers in Europe, Asia, the Americas and the Middle East. Store fasteners dry and protected until installation, and keep coated parts in their packaging until use; specific packing and preservation requirements can be stated on the order and confirmed at quotation.

BSPP and BSPT share the same thread geometry — so what differs, and why can't BSP fittings mate with NPT?

The geometry is shared — the collected chart's one set of diameters serves both — and the difference is the sealing philosophy. BSPP (ISO 228, G) is cut parallel: the thread provides mechanical clamping only, and sealing happens at the fitting's face against a bonded washer, O-ring or metal gasket — which makes BSPP joints repeatable and reusable, the reason hydraulics and instrumentation prefer it. BSPT (ISO 7, R) is cut on the same 1-in-16-type taper concept as NPT: flank interference plus sealant makes the joint, so it suits welded-adjacent plumbing and less-frequently-disturbed runs. Neither parallelism nor taper is an option to choose by feel — the mating port decides. Against NPT the incompatibility is hard geometric: BSP runs the 55° Whitworth form with rounded crests at 14 or 11 TPI on its sizes; NPT runs 60° sharp-ish forms at its own TPI ladder. A 1/2 BSP against a 1/2 NPT starts together (both 14 TPI), binds after a turn or two, wrecks both threads and never seals — the most common fitting-counter error where the two worlds meet. The practical discipline: identify fittings by measuring OD and TPI against the chart (the size names lie — "1/4 BSP" is 13.157 mm major), and never adapt BSP to NPT with sealant and force.

What is the MOQ and lead time for threaded parts on this standard?

The minimum order quantity is 10,000 pieces. Stock items ship in 3–7 days; non-stock items are confirmed at quotation. Common thread sizes on this standard are widely stocked; confirm the exact schedule against quantity and size mix at quotation.