Earl's Performance Metric Aluminum Crush Washers

Earl's Performance Metric Aluminum Crush Washers provide a dependable, leak-free sealing solution for straight-threaded metric fittings and adapter applications where a port does not feature an O-ring relief groove. Precision-manufactured from high-quality aluminum, each washer is engineered to deform slightly under torque — conforming to mating surface irregularities to create a consistent, pressure-resistant seal in demanding automotive, racing, and motorsport environments.

Key Features:

• High-Quality Aluminum Construction: Designed to crush and flow into surface irregularities, creating a positive, reliable seal without the need for additional thread sealants or compounds
• Straight Thread Compatible: Engineered specifically for use with metric straight-threaded fittings and adapter configurations across a wide range of applications
• No O-Ring Groove Required: An ideal sealing solution for ports and mating surfaces that lack an O-ring relief groove, expanding installation flexibility
• Single-Use Design: Ensures consistent seal integrity with every installation — each washer should be replaced upon removal and reinstallation of a fitting to maintain sealing performance
• Broad System Compatibility: Suitable for fuel, oil, coolant, and hydraulic systems where leak-free sealing performance is critical
• Multiple Size Options: Available across a range of metric dimensions to accommodate a variety of fitting and port configurations — select the correct size for your application from the available variants
• Sold in Convenient Multi-Packs: Each size option is packaged in quantity sets, making them ideal for professional shops and repeat-use applications

Backed by decades of proven motorsport heritage, Earl's Performance Plumbing brought aviation-grade fluid transfer technology to the automotive performance market and has been a trusted name in high-performance plumbing ever since. As part of the Holley Performance family, Earl's continues to be the go-to supplier for top motorsport teams, engine builders, and professional fabrication shops worldwide. These metric crush washers reflect the same commitment to precision engineering and sealing reliability found across the entire Earl's product line.