Trailer King Pin Parts & Fifth Wheel Coupling Components

Trailer king pin parts are critical safety components forming the primary mechanical connection between the trailer skid plate and the tractor unit’s fifth wheel coupling on articulated vehicles. The king pin part engages directly with the fifth wheel locking jaws, allowing controlled articulation while transferring vertical load, traction forces and braking loads. Manufactured from high-strength alloy steel and precision-machined to strict European dimensional tolerances, king pin parts must maintain correct geometry, hardness and surface finish to minimise fifth wheel wear and ensure long-term operational safety across UK and EU haulage fleets.