About Different Threads of Quick Coupling

In the world of industrial quick couplings, the thread type is a key factor that determines compatibility, sealing performance, and installation safety. Choosing the correct thread ensures that the coupling fits securely with other components, preventing leakage and system failure.

So, what are the different types of threads used in quick couplings? Let’s take a closer look.

 1. BSP Thread (British Standard Pipe)

BSP threads are widely used in Europe, Asia, and the Middle East.

BSPP (Parallel) and BSPT (Tapered) are two main subtypes.

BSP threads are measured in inches and are known for their excellent sealing with O-rings or bonded washers.

2. NPT Thread (National Pipe Thread)

NPT threads are the American standard, mainly used in North America.

They have a tapered design, which forms a tight seal when the male and female threads are tightened together.

NPT fittings usually require thread sealant or PTFE tape to ensure no leakage.

⚙️ 3. Metric Thread

Metric threads are widely used in Asia and European machinery.

Defined by pitch and diameter in millimeters (e.g., M20×1.5).

Provide a precise and strong connection, especially suitable for hydraulic and pneumatic applications.

4. JIS and Other Regional Standards

Japan and some Asian regions use JIS threads, which are similar to BSP but differ slightly in pitch and sealing design.
Always confirm thread type before installation to avoid mismatch or cross-threading.

We manufacture quick couplings compatible with BSP, NPT, Metric, and JIS threads. Our products are designed for easy installation, reliable sealing, and long-term durability—helping customers around the world build safe and efficient fluid systems.