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When you're repacking wheel bearings or replacing a worn spindle nut, it pays to use genuine Dexter hardware rather than a generic hardware-store substitute. This kit supplies the alloy steel spindle nut and matching washer that Dexter EZ Lube axle hubs are designed around.
Keep it on hand for routine bearing service, and pair it with fresh grease when you service your axle so the hub spins true and the bearings stay properly preloaded.
A small part, but the right torque on the spindle nut is what keeps your trailer's wheel bearings from running hot on the road.