NISSAN 40040-01J00 Steering Knuckle Kingpin Bearing Plate

The genuine Nissan (SKU: 40040-01J00) steering knuckle kingpin bearing plate (original designation: PLATE SPIDLE) is a premium-quality OEM component essential to the steering knuckle assembly of solid front axle vehicles. This precision-engineered plate ensures proper positioning, retention, and protection of the kingpin bearings.

Technical Characteristics and Specifications:

• Material: High-strength stamped steel alloy for maximum structural integrity.
• Surface Treatment: Anti-corrosion coating resistant to moisture, mud, and road salt.
• Fitting Position: Front axle, at the upper or lower kingpin bearing of the steering knuckle / swivel housing.
• Function: Secures the kingpin bearings firmly in place, assists in setting the correct preload, and prevents lubricant leakage.

Role and Importance of the Kingpin Bearing Plate:

The kingpin bearing plate directly influences vehicle steering stability and suspension safety. Its primary role is to securely seal and retain the kingpin bearing within the knuckle housing, shielding the rolling elements from dust, water, and other abrasive contaminants while keeping the necessary lubricating grease contained.

Typical Symptoms of Wear or Failure:

• Grease Leakage: If the plate deforms or the sealing surface is compromised, lubricant can leak from the bearing housing.
• Corrosion and Material Fatigue: Continuous exposure to moisture can cause severe rusting, weakening bearing retention.
• Steering Instability: Damage or loosening of the plate can increase play in the kingpin bearing, leading to vague handling or knocking noises during cornering.

To ensure safe and precise steering, any damaged, deformed, or heavily corroded kingpin bearing plate should be promptly replaced with a genuine OEM part.