The Meritor 3.48" Thread Diameter Temper-Loc Spindle Nut is designed to provide superior strength and durability for your vehicle. This single nut design eliminates the potential for overtightening the jam nut and pushing the outer bearing cone out of position. The nut is heat-treated for superior strength and durability. It is easy to install with only one nut, meaning less time wasted trying to reposition multiple nut assemblies. FleetPride is your First Click in Heavy Duty®.