BSP/BSPT Thread Fitting

There are 2 types of BSP threads: BSPT (British Standard Pipe Thread) and BSPP (British Standard Parallel Pipe). They both have a thread angle of 55°, BSPT is a tapered thread, whereas BSPP is a straight or parallel thread.

British Standard Pipe (BSP) threads are by far the most popular with the United Kingdom, all of Europe, Australia, New Zealand, and South Africa adopting these standards.

There are 2 types of threads: BSPT (British Standard Pipe Thread) and BSPP (British Standard Parallel Pipe). They both have a thread angle of 55°, BSPT is a tapered thread, whereas BSPP is a straight or parallel thread. This distinction plays a significant role in their application and sealing mechanisms.

BSPT Threads

  • Thread conforms to ISO 228-1
  • Port conforms to ISO 1179
  • Pitch & diameter measured in inches e.g. G1/4-19
  • Parallel threads require o-ring, crush washer, gasket or metal to metal seal between connections for pressure tight connection
  • Thread angle is 55°

BSPP Threads

  • Thread conforms to ISO 7
  • Pitch and diameter are measured in inches, e.g. R3/8-19
  • Tapered thread profile seals by metal to metal interference fit, usually requires sealing compound for pressure tight connection
  • Taper angle is 1° 47′, the same as NPT(F)
  • Thread angle is 55°
  • Not interchangeable with NPT(F)

BSP/BSPT Thread Fitting Selection:
Based on thread specifications, sealing methods, tube type, diameter, pressure level, and medium. Correct installation ensures stability and sealing performance.

Summary: BSP/BSPT thread fittings, common in the industrial field, must comply with standards and specifications to ensure sealing performance, corrosion resistance, safety, and stability.

About Us

China Huiqi (Beijing) Technology Co., Ltd specializes in the manufacturing of high-quality hydraulic fittings.
Our range of products includes tube fittings, hose fittings, adapters, hose assemblies, flanges, ferruels,and various other types of hydraulic parts.
We offer products with thread standards including BSP, BSPT, SAE, JIS, DIN, ISO, Metric, and more, while also providing custom OEM services.

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