BSP (British Standard Pipe) threads and NPT (National Pipe Thread) threads are two common pipe thread standards, with some key differences:
BSP Threads: These are British standards, formulated and managed by the British Standards Institution (BSI). They have a thread angle of 55 degrees and a taper ratio of 1:16. BSP threads are widely used in Europe and Commonwealth countries, commonly in the water and gas industries.
NPT Threads: These are American standards, formulated and managed by the American National Standards Institute (ANSI) and the American Society of Mechanical Engineers (ASME). NPT threads have a thread angle of 60 degrees and come in both straight (cylindrical) and tapered forms. NPT threads are known for their good sealing performance and are commonly used to transport liquids, gases, steam, and hydraulic fluids.
BSP Threads: They typically use washers or sealant to achieve sealing.
NPT Threads: Designed for metal-to-metal sealing, they often do not require additional sealant.
BSP Threads: Commonly used in the UK, Australia, New Zealand, and other regions.
NPT Threads: More common in the United States and related markets.
NPT Threads: American standard with a 60-degree thread angle, commonly used in North America and ANSI-compliant regions.
BSP Threads: British standard with a 55-degree thread angle, typically used in Europe and Commonwealth countries.