NISSAN 25152-C7000 Rear Wheel Bearing Lock Washer

The genuine OEM Nissan rear wheel bearing lock washer is a critical safety fastening component designed primarily to prevent the rear wheel hub nut (axle nut) from loosening. Under the continuous vibration, axial and radial loads, and rotational torque generated during vehicle operation, the retaining nut is prone to backing off. This specially designed lock washer mechanically locks the nut on the spindle, ensuring the specified wheel bearing preload is maintained reliably over time.

Technical Characteristics and Material Quality

• Material Composition: High-strength, cold-rolled and hardened steel resistant to mechanical deformation and shearing forces.
• Surface Treatment: Specialized anti-corrosion coating (zinc-plated or phosphated surface) protecting the component against moisture, road salt, and environmental exposure.
• Design: Precision inner tab or grooved profile that seats accurately into the spindle keyway, preventing the washer from rotating.
• Fitting Position: Rear axle, wheel hub assembly (suitable for both left and right sides).

Function and Importance of Replacement

According to automotive safety standards, wheel bearing lock washers are classified as single-use components. When replacing the wheel bearing, or during any service procedure that involves loosening the axle nut, the lock washer must be replaced with a brand-new genuine part. Repeated bending of the locking tabs causes metal fatigue and micro-cracks, which can lead to tab failure and subsequent loosening of the wheel assembly.

Signs of Wear and Failure

• Visually Identifiable Damage: Cracks at bend points, deformed locking tabs, or severe surface corrosion.
• Mechanical Play: Minor free play in the wheel hub caused by loosened retention.
• Abnormal Noises: Clicking or humming noises from the rear axle area, pointing to incorrect bearing preload and a loosened nut.