JOST part description

Features & Benefits

  • Heavy-duty bolt for fifth wheel trailer hitch applications
  • Designed for structural integrity under towing loads
  • Helps prevent frame or hitch movement under stress
  • Thread and grip match JOST fifth wheel requirements
  • Ideal for preventive replacement in hitch maintenance cycles

JOST Fifth Wheel Trailer Hitch Mount Bolt

Fifth wheel mounting hardware plays a vital role in trailer coupling safety. The JOST Fifth Wheel Trailer Hitch Mount Bolt is specifically machined to fit high-torque structural applications required in semi-truck hitch systems. This bolt contributes to the secure anchoring of the fifth wheel assembly to the frame, maintaining load stability during cornering, acceleration, and braking. When this bolt becomes corroded or weakened, the structural integrity of the hitch is compromised—posing risk to both equipment and load. Using OEM-specified hardware like the JOST SK73121-55 prevents improper fit and reduces compliance issues during inspections.

JOST® is a global leader in manufacturing safety-critical components for commercial vehicles. Its products are divided into three categories—vehicle interface, handling solutions, and maneuvering—and are manufactured in its different production sites located in more than 20 countries across five continents. Since it started as a humble forge of ball bearing turntables in 1952, JOST has grown exponentially and has become the leading supplier of landing gears and fifth wheel couplings around the world. Currently, there are five brands under JOST, including ROCKINGER, JOST, TRIDEC, Quicke, and Edbro. All these brands are renowned names in the industry, thanks to their high-quality products and continuous innovation.

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