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Introduction to BSP Threads
The British Standard Pipe (BSP) thread is a system of threads that has been widely adopted for connecting pipes and fittings. Known for its strength and reliability, BSP threads are used in numerous industries, ranging from automotive to aerospace, oil and gas, and defense.

This article provides a comprehensive guide to the BSP thread chart for 2025, highlighting the updates, types, and applications of BSP threads, as well as the role of MisolGroup, a leading manufacturer in the field of thread cutting tools and components.
BSP Thread Chart Update 2025
The BSP thread chart for 2025 introduces a few notable updates that affect the specifications, dimensions, and tolerances of BSP threads. These changes aim to improve compatibility, safety, and efficiency in industrial applications.
- Standardized Thread Tolerances: The 2025 update introduces tighter tolerances to ensure more precise thread engagements, reducing the risk of leaks and failure.
- New Thread Size Options: The latest update includes several new sizes for BSP threads, catering to the evolving needs of industries such as automotive and aerospace.
- Improved Material Recommendations: The updated chart now specifies stronger and more durable materials, including advanced alloys, for use in high-pressure systems.
- Expanded Compatibility: The update improves cross-compatibility between BSP and other international thread standards, particularly in global manufacturing and export scenarios.
Types of BSP Threads
BSP threads come in two primary types: BSPP (British Standard Pipe Parallel) and BSPT (British Standard Pipe Tapered). Each type serves distinct purposes and has specific advantages depending on the application.
BSPP (British Standard Pipe Parallel)

BSPP threads are parallel threads, commonly used for applications that require sealing with a washer or O-ring. This type of thread is used in applications where the connection needs to be sealed by compression rather than thread engagement.
- Applications: Plumbing, hydraulic systems, and fuel systems.
- Features: Seals externally, requires a sealing element like an O-ring or washer.
BSPT (British Standard Pipe Tapered)

BSPT threads are tapered, meaning the threads get narrower as they move down the pipe, providing a tight seal when threaded. These threads are ideal for high-pressure applications where a robust, leak-proof seal is essential.
- Applications: High-pressure systems in industrial plants, automotive and aerospace components, and marine equipment.
- Features: Self-sealing with no need for additional sealing elements.
Applications of BSP Threads
BSP threads are utilized across a wide array of industries due to their robustness and versatility. Below are some key sectors that benefit from BSP thread technology:
- Automotive: BSP threads are often used in fuel systems, hydraulic connections, and other critical automotive applications.
- Aerospace: Aerospace components such as fuel lines, hydraulic systems, and other parts use BSP threads to ensure a secure connection under high pressure.
- Oil and Gas: In the oil and gas industry, BSP threads are essential for pipe fittings and fluid transfer systems, ensuring durability and safety.
- Defense: In defense, BSP threads are used in high-performance systems that require high-strength connections, such as weapons systems and vehicle hydraulics.
MisolGroup’s Role in BSP Thread Manufacturing

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MisolGroup, a leading manufacturer based in China, specializes in producing high-performance thread cutting tools. Founded in 2005, the company is recognized globally for its reliable and precision-engineered products, which include BSP thread taps, pipe taps, and other specialized components.
- Carbide Taps: MisolGroup’s carbide taps are designed for cutting tough materials such as stainless steel, ensuring durability and longevity.
- Spiral Flute Taps: Ideal for threading deep holes and blind holes, these taps provide excellent performance in both BSPP and BSPT applications.
- Nut Taps: These taps are engineered to create precise threads in nuts and bolts, suitable for BSP applications.
Summary Table: Key Points
| Aspect | Details |
|---|---|
| Update Year | 2025 |
| Types of BSP Threads | BSPP (Parallel) and BSPT (Tapered) |
| Applications | Automotive, aerospace, oil & gas, defense |
| Key Benefits | Improved thread tolerances, new sizes, and material upgrades |
FAQs
What are BSPP and BSPT threads?
BSPP (British Standard Pipe Parallel) threads are used with sealing washers or O-rings, while BSPT (British Standard Pipe Tapered) threads are self-sealing and provide a tight fit under high pressure.
Why are BSP threads so widely used?
BSP threads are known for their reliability, strength, and versatility in applications that require leak-proof seals, especially in high-pressure systems.
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