Selecting the appropriate thread standard is crucial, and requires a comprehensive understanding from multiple angles. This article aims to delineate the distinctions between the JIS (Japanese Industrial Standard) and BSP (British Standard Pipe) thread standards, aiding you in making an informed choice that best satisfies your requirements.
What’s JIS?
JIS stands for Japanese Industrial Standards. It’s a set of rules used in Japan for making things. It has BSPP thread with 30 degree cone/seat. These rules are made by a group in Japan and shared by the Japan Standards Association. In the area of making and fixing machines, JIS has some rules for threads (the ridges on screws or pipes that help them fit together). For example, JIS B0203 talks about metric threads, and JIS B0205 talks about pipe threads. These rules tell you things like the size, shape, and spacing of the threads to make sure they fit together well and work reliably. This thread standard is used a lot in Japan for making and working with machines.
What’s BSP?
- BSP Thread: BSP threads have rounded crest and root, characterized by a 55-degree thread angle.
- Types of BSP Threads:
- BSPP (Parallel): Also known as “G” or Gas threads, BSPP threads maintain a constant diameter. They’re straight and parallel, making them ideal for high-pressure and high-temperature applications. To ensure a tight seal, it’s advisable to use a sealant. Common applications include hose ends, adapters, and ports. A unique feature is the use of bonded rings, which provide a leak-tight seal when pressed between the male and female fittings.
- BSPT (Tapered): These are the “R” threads. Unlike their parallel counterparts, BSPT threads taper, varying in diameter along their length. They’re typically used in machined spot faces, providing a strong, leak-resistant connection. A sealant is recommended for an extra layer of security.
What’s the main difference between JIS and BSP?
- Thread type
JIS: The JIS standard defines metric threads (JIS B0203) and pipe threads (JIS B0205).
BSP: The BSP standard defines British thread (BSPP) and British tapered thread (BSPT).
- Size standard
JIS: The JIS standard defines the dimensions of threads in metric units, such as diameter, pitch, and peak-to-valley dimensions.
BSP: The BSP standard defines the dimensions of threads in imperial units (inches), such as diameter, pitch, and peak-to-valley dimensions.
- Pitch
JIS: The JIS standard specifies the pitch of metric threads, usually expressed in millimeters.
BSP: The BSP standard specifies the pitch of the British thread, usually expressed in the number of threads (the number of threads per inch).
- Thread shape
JIS: The metric thread of the JIS standard adopts parallel thread (BSPP), and the top of the pipe thread has a thread fillet.
BSP: BSP standard British thread is divided into parallel thread (BSPP) and tapered thread (BSPT), the latter has a taper.
Conclusion:
The choice between JIS and BSP should be made based on your specific needs. Selecting the right thread standard is crucial for ensuring the quality, safety, and reliability of your pipeline connections. The comparison and guidance provided above aim to assist you in making an informed decision, facilitating a seamless application to your projects and tasks. Should you have any queries, don’t hesitate to contact us!
