BSPT/BSPP FITTINGS Manufacturers

INDUSTRY & KNOWLEDGE

What is the difference between Bspt/bspp Fittings and other Fittings?
The difference between BSPT/BSPP fittings and other fittings (such as NPT, JIC, or AN fittings) lies primarily in the thread type, sealing method, and pressure ratings. Here's a breakdown of the differences:
1. BSPT (British Standard Pipe Tapered) vs BSPP (British Standard Pipe Parallel)
BSPT (Tapered) fittings have a tapered thread design. The threads taper along the length of the fitting, so the diameter of the thread becomes progressively smaller. This taper helps create a tight seal when the male and female parts are threaded together, especially for high-pressure applications.
BSPP (Parallel) fittings have straight threads that do not taper. The seal in BSPP fittings is typically achieved using a gasket or O-ring placed at the base of the threads or on a mating surface. These fittings are generally used in low-pressure or non-sealing applications where sealing is achieved by an external component (like an O-ring or washer).

2. Thread Type
BSPT threads are tapered, meaning the threads get smaller towards the end, creating a seal as they tighten.
BSPP threads are parallel and typically require a sealing mechanism (like a washer, O-ring, or sealing compound) to ensure a leak-proof connection.

3. Sealing Mechanism
BSPT fittings rely on the wedging action of the tapered threads for sealing. As the male fitting is screwed into the female fitting, the threads force the parts together to create a seal.
BSPP fittings require an external sealing component, such as a gasket or O-ring, because the threads themselves do not form a seal.

4. Usage
BSPT is often used in high-pressure applications where a tight seal is critical, such as hydraulic systems or steam systems.
BSPP is typically used in low-pressure applications or systems where the sealing is achieved using additional components (e.g., a washer or O-ring) rather than the threads themselves.

5. Comparison with Other Fittings
NPT (National Pipe Thread)
NPT is a tapered thread like BSPT, but it is more commonly used in North America. The main difference is that NPT threads have a different angle and pitch compared to BSPT threads. NPT threads create a seal through their tapered design, similar to BSPT, but the thread profiles are not interchangeable.
NPT fittings require thread sealing tape or paste to achieve a leak-proof seal.

JIC (Joint Industry Council) and AN (Army-Navy) Fittings
JIC and AN fittings are used for high-pressure hydraulic systems, but they differ in design. Both use a 37-degree flare angle, which is designed to form a metal-to-metal seal. This is different from BSPT/BSPP, which rely on threads or external sealing components.
These fittings are often used in aviation, automotive, and industrial applications.

Metric (M) Fittings
Metric fittings use a different thread standard, often with parallel threads like BSPP. The main difference is that the size is denoted in millimeters and follows a different thread pitch standard (ISO metric threads).