Copper Crush Washer – 9/16″ ID × 21 mm OD

The 4LifetimeLines® Copper Crush Washer (9/16″ inner diameter, 21 mm outer diameter) provides a precision, permanent seal for brake banjo bolts and hydraulic fittings. Engineered from high-purity copper, this washer deforms under torque to fill microscopic surface imperfections, ensuring a one-time, leak-proof joint critical to safe braking and hydraulic performance.

Key Benefits

Accurate Fit: 9/16″ (14.3 mm) ID perfectly accommodates standard banjo bolt shanks, while the 21 mm OD covers the mating surface for complete sealing.

Corrosion Resistance: Premium copper alloy resists brake-fluid vapors, salt, and moisture for long-term durability.

Heat Dissipation: Excellent thermal conductivity helps carry heat away from fitting junctions, maintaining stable hydraulic pressure.

One-Time Crush Seal: Washer compresses under specified torque, creating a permanent, leak-free bond with no additional sealants.

Service-Ready: Replace at each brake service interval to maintain reliable sealing performance.

Installation & Usage

Clean Mating Surfaces: Remove any old gasket material, dirt, or corrosion from both bolt face and banjo fitting.

Position Washer: Slide the copper washer onto the banjo bolt, ensuring it sits flat against the fitting.

Torque to Spec: Fasten the bolt to manufacturer-recommended torque; the washer will crush and conform to both surfaces.

Inspect for Leaks: After system bleeding, pressurize and check for any seepage around the joint.

Ready to ensure leak-free fittings?
Add the 9/16″ × 21 mm Copper Crush Washer to your cart now and lock in precision sealing for every brake and hydraulic connection.