Washer Copper 9in Ford

The Washer Copper 9in Ford crush washer set from RATECH is a critical OEM-specification component for Ford 9-inch differential assembly and maintenance. Used by automotive technicians, restoration specialists, and serious gear heads, this copper crush washer ensures proper axle shaft preload and bearing torque retention during differential rebuild or service intervals. Each set contains ten individual washers, providing multiple applications across single or multiple differential jobs.

Manufactured from pure copper, the Washer Copper 9in Ford features a 0.405-inch inner diameter sized to match OEM Ford specifications precisely. Copper's malleability allows the washer to deform uniformly under torque, creating a permanent seal that prevents differential fluid weepage and maintains critical preload on pinion bearings. Unlike soft steel or aluminum alternatives, copper does not gall threaded fasteners and conforms to both new and slightly worn surfaces without requiring full bolt replacement—a property valued by technicians performing differential rebuilds on both original and modified Ford 9-inch housings.

Professionals rebuilding or servicing any Ford 9-inch differential—whether in street rods, performance vehicles, or classic muscle cars—depend on RATECH crush washers to meet OEM torque specifications and ensure leak-free, long-term reliability. Installation is straightforward: place the washer on the pinion shaft, thread the pinion nut to factory-specified torque, and the copper deforms to create the seal. A single set of ten washers covers multiple rebuild cycles or allows technicians to maintain an inventory for fleet maintenance applications.