NISSAN 40264-02J10 Front Wheel Bearing Lock Washer

The genuine part number Nissan 40264-02J10 is an authentic OEM front wheel bearing lock washer (WASHER-FRONT WH). This precision retaining component plays a critical role in the safe and stable operation of the front wheel hub assembly by preventing the wheel bearing retaining nut from backing off or loosening.

Function and Importance

The primary function of the front wheel bearing lock washer is to mechanically lock the wheel bearing adjusting nut in place. Under the continuous vibration, thermal expansion, and dynamic loads encountered during driving, the retaining nut tends to loosen over time. This lock washer prevents rotation, thereby maintaining the precise factory bearing preload. Without the correct preload, bearing play may develop, leading to unstable vehicle handling, premature bearing wear, and in extreme cases, wheel hub seizure or detachment.

Technical Specifications and Material Quality

• Material: High-strength, hardened spring steel that resists mechanical stress and fatigue fracture.
• Design: Specially tabbed/slotted lock washer geometry designed to fit Nissan factory spindle grooves precisely.
• Surface Treatment: Corrosion-resistant coating protecting against oxidation caused by moisture, mud, and road salts.
• Installation Position: Front axle, wheel hub assembly (left and right sides).

Maintenance and Replacement Guide

From a safety standpoint, the lock washer is considered a single-use component. During any service procedure that involves disassembling, adjusting, or replacing the wheel bearing, the lock washer must be replaced with a new genuine OEM part. Repeatedly bending the locking tabs causes metal fatigue and micro-cracking, which can lead to tab breakage and complete loss of the locking function.