KP-0412
Kingpin
SAF-Holland

Kingpin with a 2-inch diameter cross-section designed to form the core pivot point in a conventional heavy-duty steer axle assembly. The feature set emphasizes a precise mounting bore and load-bearing geometry essential for safe, predictable steering under maximum gross weight ratings. The VMRS code places this component within the steering and alignment subsystem, guiding maintenance planning around lubrication, seal integrity, and wear evaluation. In service, this kingpin supports consistent kingpin geometry, reduced drift, and improved return-to-center behavior after steering input. Practical applications include tractors and line-haul trucks operating under heavy traffic density and challenging road surfaces where steering precision directly impacts maneuverability and tire wear. Compatibility depends on axle housing bore size, locking mechanism design, and compatible bearing cups. Regular inspection of bore wear, proper lubrication, and torque verification during installation are recommended to ensure reliable performance over the vehicle’s service life.