5/16 Pipe - Imperial (UNF/BSP/BSF) Unions

When you're working on classic British vehicles, American imports, or any system still running imperial brake and clutch lines, having the correct unions is non-negotiable. These essential fittings provide the secure, leak-free connections vital for hydraulic integrity.

From repairing a localised corroded section to fabricating an entire custom hydraulic line, these imperial unions are designed for reliability. They are critical for technicians undertaking restorations, bespoke builds, or routine maintenance where original components are no longer viable or available. A precise, well-seated union is the foundation of a safe, functional braking or clutch system.

Material Considerations: Copper vs. Copper-Nickel

Choosing the right pipe material is as important as the union itself, and each has its place in the workshop:

• Copper: A traditional choice, copper pipe is highly valued for its malleability. It's exceptionally easy to form, bend, and flare, making installation straightforward, particularly in complex routing or tight spaces. For many standard repairs and custom lines, copper provides an excellent balance of workability and performance.
• Copper-Nickel (CuNi / Kunifer / Cupro-Nickel / NiCopp): For applications demanding maximum durability and resistance to harsh environments, copper-nickel is the superior option. While slightly stiffer to work with than pure copper, its significantly higher resistance to corrosion means it stands up far better to road salt, moisture, and general workshop contaminants. Furthermore, its increased fatigue strength provides an extra layer of resilience, making it a preferred choice for long-term reliability in demanding conditions.

Regardless of your pipe material choice, these unions are manufactured to exacting standards right here in the UK. This commitment to quality ensures a consistent fit and reliable performance, providing peace of mind that your hydraulic connections are sound.

Imperial unions for brake and clutch pipes. All made to the highest quality in the UK.

Cooper pipes are more traditional and easier to work with however Copper Nickel (aka CuNI, Kunifer, cupro-nickel or NiCopp) is more resistant to corrosion and has a higher fatigue strength.