Aluminium Crush Washers

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Aluminium Crush Washers – Sealing Washers for Fluid Fittings

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

Why Choose Our Aluminium Crush Washers?

Soft Aluminium Construction

Manufactured from aluminium that compresses during installation, allowing the washer to conform to the mating surfaces and create a reliable fluid-tight seal.
Lightweight & Corrosion-Resistant

Aluminium provides a lightweight sealing solution with good corrosion resistance, making these washers suitable for automotive, motorsport and other fluid system applications.
Multiple Internal & External Diameters

Available in a range of internal and external diameter combinations to suit different fittings and sealing surfaces:
- 12mm ID x 16mm OD – M12
- 14mm ID x 18mm OD – M14, AN6
- 14mm ID x 20mm OD – M14, AN6
- 16mm ID x 20mm OD – M16, 3/8" BSPP
- 16mm ID x 22mm OD – M16, 3/8" BSPP
- 18mm ID x 22mm OD – M18
- 18mm ID x 24mm OD – M18
Suitable for a Range of Fluid Systems

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

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

What is an Aluminium Crush Washer?

An aluminium 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 in suitable fluid connections.

Single-Use Sealing Washer

Aluminium 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: Aluminium Lightweight material 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 aluminium crush washer sizes
Product Code	Internal Diameter	External Diameter	Common Compatibility
WSH-CRU-AL-12-16	12mm	16mm	M12
WSH-CRU-AL-14-18	14mm	18mm	M14 AN6
WSH-CRU-AL-14-20	14mm	20mm	M14 AN6
WSH-CRU-AL-16-20	16mm	20mm	M16 3/8" BSPP
WSH-CRU-AL-16-22	16mm	22mm	M16 3/8" BSPP
WSH-CRU-AL-18-22	18mm	22mm	M18
WSH-CRU-AL-18-24	18mm	24mm	M18

Banjo Bolts
Brake Systems
Clutch Systems
Fuel Systems
Oil Systems
Coolant Systems
Hydraulic Systems

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

Frequently Asked Questions

What are aluminium crush washers used for?
Aluminium crush washers are used to create a fluid-tight seal between suitable fittings and mating surfaces. They are commonly used in brake, clutch, fuel, oil and coolant systems.
What sizes are available?
We offer the following internal and external diameter combinations:
- 12mm ID x 16mm OD – M12
- 14mm ID x 18mm OD – M14, AN6
- 14mm ID x 20mm OD – M14, AN6
- 16mm ID x 20mm OD – M16, 3/8" BSPP
- 16mm ID x 22mm OD – M16, 3/8" BSPP
- 18mm ID x 22mm OD – M18
- 18mm ID x 24mm OD – M18
Why are some internal diameters available with different external diameters?
The different external diameters allow you to select a washer that suits the available sealing surface around the fitting. For example, the 14mm internal diameter is available with either an 18mm or 20mm external diameter.
Are these aluminium crush washers compatible with your custom braided hoses?
They can be used with compatible fittings and connections within brake, clutch, fuel, oil and coolant hose systems. Select the washer according to the fitting size and sealing surface rather than the hose size itself.
How do I install an aluminium crush washer?
Position the crush washer between the fitting and its mating surface, then tighten the connection to the appropriate torque specification. The aluminium compresses slightly as the connection is tightened to create the seal. Always check the completed connection for leaks before use.
Can aluminium crush washers be reused?
No. Aluminium crush washers are intended for single use. Once compressed, the washer should be replaced whenever the connection is dismantled and reassembled.
Are the aluminium crush washers sold individually?
Yes. Each aluminium crush washer is sold individually, so you can select the required size and order exactly the quantity you need.