Copper Crush Washers

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Copper Crush Washers – Sealing Washers for Banjo Bolts & Fluid Fittings

Ensure reliable, leak-free connections with our high-quality Copper Crush Washers. Designed for use with banjo bolts and other suitable fluid fittings, the soft copper compresses between mating surfaces when tightened to create an effective seal in brake, clutch, fuel, oil and other fluid systems.

Why Choose Our Copper Crush Washers?

Soft Copper Construction

Manufactured from annealed copper, allowing the washer to deform under tightening pressure and conform to the mating surfaces for a reliable seal.
Ideal for Banjo Bolt Connections

Suitable for sealing compatible banjo fittings, with a washer normally positioned between each sealing face of the banjo connection.
Available in Multiple Sizes

Choose the appropriate internal diameter for your fitting:
- 6mm – M6
- 8mm – M8
- 10mm – M10, 3/8" and 1/8" BSPP
- 11mm – 7/16" and AN4
- 12mm – M12
- 14mm – M14 and AN6
Suitable for a Range of Fluid Systems

Ideal for brake, clutch, fuel and oil systems where a copper crush washer is required to seal between two mating surfaces.
Supplied Individually

Each copper crush washer is sold individually, allowing you to order the exact size and quantity required for your installation.

What is a Copper Crush Washer?

A copper crush washer is a soft-metal sealing washer that compresses when a fitting is tightened. This deformation allows the washer to conform to the mating surfaces and create a fluid-tight seal, making copper crush washers particularly suitable for banjo bolts and other hydraulic or fluid connections.

Single-Use Sealing Washer

Copper crush washers should be replaced once they have been compressed. Always install a new washer when a sealed connection is dismantled to help ensure a reliable seal when the fitting is reassembled.

Washer Type: Crush Washer Compressible sealing washer for fluid connections
Material: Annealed Copper Soft metal construction designed to compress during installation
Seal Type: Compression Seal Deforms against mating surfaces when tightened
Reuse: Single Use Replace after the washer has been compressed
Quantity: 1 Washer Sold individually

Available copper crush washer sizes
Product Code	Internal Diameter	Common Compatibility
WSH-CRU-CU-6	6mm	M6
WSH-CRU-CU-8	8mm	M8
WSH-CRU-CU-10	10mm	M10 3/8" · 1/8" BSPP
WSH-CRU-CU-11	11mm	7/16" AN4
WSH-CRU-CU-12	12mm	M12
WSH-CRU-CU-14	14mm	M14 AN6

Banjo Bolts
Brake Systems
Clutch Systems
Fuel Systems
Oil Systems
Turbo Oil Lines
Hydraulic Systems

Banjo Bolts

A single banjo connection normally requires two crush washers, while a double banjo connection normally requires three.

Free repair or replacement for two years from the date of purchase. Learn more

Frequently Asked Questions

What are copper crush washers used for?
Copper crush washers are used to create a fluid-tight seal between suitable fittings and mating surfaces. They are commonly used with banjo bolts and other connections in brake, clutch, fuel and oil systems.
What sizes are available?
We offer the following internal diameters:
- 6mm – M6
- 8mm – M8
- 10mm – M10, 3/8" and 1/8" BSPP
- 11mm – 7/16" and AN4
- 12mm – M12
- 14mm – M14 and AN6
Are these copper crush washers compatible with your brake and clutch lines?
Yes. They can be used with compatible banjo bolt connections on our Custom Brake Lines and Custom Clutch Lines. Select the washer size that corresponds with the banjo bolt or fitting being used.
How many copper crush washers do I need for a banjo fitting?
A standard single banjo connection normally requires two copper crush washers — one on each side of the banjo fitting. A double banjo connection normally requires three washers — one on each outer side and one between the two banjo fittings.
How do copper crush washers create a seal?
The soft copper compresses as the connection is tightened, allowing the washer to conform to the mating surfaces and create a fluid-tight seal.
Can copper crush washers be reused?
No. Copper crush washers are intended for single use. Once compressed, the washer should be replaced whenever the connection is dismantled and reassembled.
Are the copper crush washers sold individually?
Yes. Each copper crush washer is sold individually, so you can select the required size and order exactly the quantity you need.