The BSP thread is defined as the British Standard Pipe, and it is commonly used in Europe, Australia, and several commonwealth nations. It is a set of technical standards for screw threads which are internationally adopted for connecting and sealing various pipes and fitting. It uses the process of an external male thread with an internal female thread. BSP basically includes two types of threads, which is BSPP- straight or parallel, or BSPT- tapered.
BSP thread types
BSPP (British Standard Pipe Parallel)
*Parallel thread: The diameter of the thread remains constant along the length of the thread.
*Sealing method: Relies on a separate sealing mechanism, such as a washer, O-ring, or gasket, to achieve a leak-tight seal.
*Applications: Commonly used in low-pressure applications, fluid transfer, and where the connection can be disassembled and reassembled multiple times without wear to the threads.
*Designation: Threads are denoted with the letter “G” (e.g., G1/2).
*International standard: ISO 228, the standard for parallel threads in BSPP fittings, specifies dimensions, tolerances, and more. Basically, it ensures a good fit and proper functioning of parallel threaded fittings.
BSPT (British Standard Pipe Thread)
*Tapered Thread: The diameter of the thread increases or decreases along the length of the thread.
*Sealing method: Achieves a seal by the threads themselves, which compress against each other as they are tightened, creating a tight and secure fit.
*Applications: Used in situations where a high-pressure, leak-tight seal is required, such as in hydraulic systems, gas lines, and high-pressure water systems.
*Designation: Threads are denoted with the letter “R” (e.g., R1/2).
*International standard: ISO 7 focuses on tapered threads, such as those found in BSPT fittings. The standard defines the dimensional rules and how the taper works. Its purpose is to ensure that tapered fittings have a good seal, especially in high-pressure systems.
Key Features
*Thread form: BSP threads have a Whitworth thread form, which is a 55-degree thread angle.
*Size range: BSP fittings come in a range of sizes, commonly from 1/8 inch to 6 inches in diameter.
*Materials: Typically made from brass, stainless steel, carbon steel, and various plastics, depending on the application and required durability.
BSP Thread Chart
BSP Fittings Benefits
*Versatility: One of the greatest advantages of BSP fittings is that they are suitable for a wide range of applications. From water supply systems to industrial hydraulic lines, these fittings can do it all. Whether you’re a seasoned maintenance professional or just setting up your first hydraulic system, they’re designed to meet your needs.
*Durability: These fittings are extremely robust. They are designed to withstand high pressures and resist wear and tear. Their durability saves money in the long run. Quality BSP fittings may cost a little more upfront. However, when you consider their longevity and lower maintenance requirements, the overall price/performance ratio is high.
Understanding the thread dimensions and types is crucial for selecting the correct fittings and ensuring a secure and leak-proof connection in your piping systems.
QC Hydraulics is one of leading manufacturer of Stainless steel hydraulic BSP fittings over 20 years, please contact our team for more details of our products and services.