Crush Washers 3/8in-10mm 10pk

The ALLSTAR PERFORMANCE Crush Washers 3/8in-10mm 10-pack (ALL50082) is a precision aluminum fastener component designed for applications requiring controlled preload and reliable joint clamping. These crush washers function by plastically deforming under bolt tension, creating a one-time, permanent seal that prevents fastener loosening and maintains consistent clamping force over time. The 10mm inner diameter (ID) and 3/8-inch thread compatibility make these washers ideal for engine assembly, suspension systems, and critical mechanical builds where vibration-induced fastener migration poses a reliability risk.

Crush washers operate on a different principle than standard flat or lock washers. Rather than relying on spring tension or friction, they are engineered to compress progressively as bolt tension increases, reaching a predetermined thickness at which plastic deformation occurs. This designed collapse absorbs torque variance and compensates for thermal expansion and contraction, providing a superior seal in high-vibration environments. The natural aluminum finish offers corrosion resistance suitable for automotive and marine applications, while the ten-piece quantity per pack accommodates multiple fastener points or provides spares for field replacement. The lightweight profile (0.02 lbs total) eliminates weight concerns while maintaining structural integrity.

Mechanics, engine builders, and motorsports technicians routinely specify crush washers for oil pan drain plugs, cylinder head bolts, intake manifold fasteners, and transmission pan sealing points—applications where conventional washers fail to prevent leakage or fastener creep. Once a crush washer has been compressed, it cannot be reused; this pack of ten ensures adequate inventory for both initial assembly and future service intervals. Sourcing OEM-equivalent crush washers from a trusted supplier eliminates the risk of undersized or overspecified components that compromise seal integrity or overtighten fasteners.