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The BSP Thread (British Standard Pipe) is one of the most widely used pipe thread standards globally, especially in plumbing, valves, pipe fittings, and hydraulic systems. At Perfect Engineers, we offer a wide range of BSP-threaded Ball Valves, Fittings, and Couplings that are compatible with British and international piping systems for water, oil, gas, steam, and chemicals.
Whether you’re connecting pipes in industrial systems, HVAC lines, or sanitary installations, BSP threads ensure secure, leak-tight, and standard-compliant connections.
BSP (British Standard Pipe) is a threading system standardized under ISO 228 (parallel) and ISO 7 (tapered), used for joining pipes and fittings.
There are two primary types:
| Feature | BSPP (Parallel) | BSPT (Tapered) |
|---|---|---|
| Standard | ISO 228 / DIN 259 / BS 2779 | ISO 7 / BS 21 |
| Designation | G (e.g., G ½) | R (e.g., R ½) |
| Sealing Method | O-ring / Washer / Face Seal | Thread Interference + Sealant |
| Common Use | Valves, gauges, hydraulic parts | Gas, steam, high-pressure lines |
| Feature | BSP Thread | NPT Thread |
|---|---|---|
| Thread Angle | 55° (Whitworth) | 60° (ANSI/ASME B1.20.1) |
| Compatibility | Not interchangeable with NPT | Requires adapters for BSP systems |
| Usage Regions | Europe, Asia, India | USA, Canada, Mexico |
| Thread Types | BSPP (Parallel), BSPT (Tapered) | All NPT threads are tapered |
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Use a flat washer or O-ring face seal for BSPP. Do not use thread tape alone.
Use PTFE thread tape or anaerobic thread sealants for tapered BSPT.
No. BSPP is parallel, and BSPT is tapered—they require different sealing methods and are not interchangeable.
Yes—especially BSPT (tapered), which offers pressure-tight sealing for gases, steam, and liquids.
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