XA311A-L-P
Fifth Wheel Top Plate, No Lube
SAF-Holland

This high-load interface component forms the critical connection between tractor and trailer, serving as the primary contact surface that transmits vertical, lateral, and braking forces through the coupling. Precision-machined mounting surfaces and carefully contoured geometry ensure even load distribution across the mounting bolts, promoting stable alignment and minimizing premature wear in the kingpin housing and surrounding structures. The no-lubricant design reduces routine maintenance while preserving consistent friction characteristics across a wide operating temperature range, enhancing reliability in harsh weather and dusty environments. In practice, it supports a broad spectrum of heavy-duty applications including long-haul, regional, and vocational operations where frequent coupling and uncoupling occur. The VMRS code identifies this family as a standard top-plate component within fifth-wheel assemblies, assisting with correct application and interchangeability across OEM and aftermarket systems that share the same interface standards. Category context places this part within the fifth-wheel top-plate ecosystem, underscoring its role in load transfer, pivot stability, and safety-critical connection. For maintenance planning, the design facilitates predictable wear patterns and straightforward torque verification, enabling proactive inspections and reducing downtime during fleet service intervals.