Update your truck or trailer with tightly fastened axles, with the Revhd 3-3/4" Severe Duty Universal Locking Spindle Nut that ensures you're Ready for the Road Ahead™. Due to its simplistic design, this replacement nut is able to secure the axle to the wheel hub assembly, while also preventing axial movement. Constructed with precise measurements and a fine-tuned locking mechanism to prevent loosening over time. FleetPride is your First Click in Heavy Duty®.