Flexible couplings can utilize various thread standards depending on the design and application requirements.
Some common thread standards used for flexible couplings include:
- NPT (National Pipe Thread): NPT is a tapered thread standard commonly used in North America for pipes and fittings. It is widely used in flexible couplings for joining pipes and creating leak-tight seals. NPT threads feature a 60-degree thread angle and require the use of thread sealant or tape to achieve a secure seal.
- BSPT (British Standard Pipe Taper): BSPT is a tapered thread standard used in the United Kingdom and many other countries worldwide. It is similar to NPT but has a different thread profile and pitch. BSPT threads are commonly used in flexible couplings for plumbing and industrial applications.
- BSPP (British Standard Pipe Parallel): BSPP is a parallel thread standard also used in the United Kingdom and other countries. Unlike tapered threads, BSPP threads have a consistent diameter along the length of the thread. BSPP threads are commonly used in flexible couplings for hydraulic and pneumatic systems.
- Metric threads: Metric threads are standardized threads used in many countries around the world, particularly in Europe and Asia. They are defined by the ISO (International Organization for Standardization) and come in various profiles,Flexible Coupling including metric coarse (M) and metric fine (MF). Metric threads may be used in flexible couplings for international applications or where metric piping systems are prevalent.
- UN/UNF (Unified National/Unified National Fine): UN and UNF threads are standardized thread series used primarily in the United States for bolts, nuts, and screws. While less common in flexible couplings, they may be used in specialized applications or in conjunction with UN/UNF threaded piping components.
- JIS (Japanese Industrial Standard): JIS threads are a thread standard used in Japan for various applications, including piping and fittings. They may be used in flexible couplings for applications in Japan or in systems using JIS-compliant components.
- DIN (Deutsches Institut für Normung): DIN threads are standardized threads used in Germany and other European countries for various applications, including plumbing and mechanical engineering. They may be used in flexible couplings for applications in countries following DIN standards.
When selecting a flexible coupling for a specific application, it’s essential to ensure that the coupling’s thread standard matches the thread standard of the piping components being connected to ensure compatibility and a secure, leak-tight seal. Additionally, proper installation techniques, such as the use of thread sealant or tape, should be followed to prevent leaks and ensure the integrity of the connection.
