NISSAN 40038-VB00A Steering Stop Bolt

The genuine Nissan (OEM) steering stop bolt with part number 40038-VB00A (factory designation: Bolt Stop) is a vital suspension component responsible for mechanically limiting the maximum turning angle of the steering gear and wheel hub.

Function and Operating Principle

The primary purpose of the steering stop bolt is to establish a physical limit for wheel travel at full steering lock. This precision-engineered part prevents tires and wheels from contacting the vehicle chassis, control arms, or other suspension components. Additionally, it plays a critical role in safeguarding constant-velocity (CV) joints by preventing them from operating at extreme angles that could lead to immediate or premature failure.

Technical Characteristics and Construction

• Material Quality: High-strength hardened alloy steel engineered to resist continuous mechanical impact and heavy loads.
• Surface Treatment: Specialized zinc-plated or galvanized corrosion protection coating resistant to mud, salt water, and de-icing road chemicals.
• Installation Position: Front axle, located at designated mounting points on the wheel hub carrier (steering knuckle), on both sides (left and right).
• Adjustability: Threaded design allows precise adjustment of the steering stop limit, which is locked firmly into position with a locknut.

Signs of Wear or Failure

Because the stop bolt experiences direct physical impact at the steering limits, it is subject to wear over time. Common symptoms of failure or wear include:

• Metallic squeaking or knocking noise: Audible noise at full steering lock indicating wear on the bolt head or a missing protective cap.
• Tire rubbing or wear: Inner tire rubbing against suspension components during sharp turns due to an excessively worn or improperly adjusted bolt.
• Damaged threads: Bending or thread damage caused by impacts to the running gear, making accurate adjustment impossible.