The Meritor Temper-Loc Spindle Nut is designed to ensure that your wheel bearings are securely fastened. Its advanced locking mechanism prevents over-tightening or under-tightening of the wheel bearings, reducing the risk of wheel separation. With its Temper-Loc design, you can rest assured that your wheel bearings will stay securely fastened. FleetPride is your First Click in Heavy Duty®.