RK-311-12414
Secondary Lock Kit
SAF-Holland

This secondary locking kit introduces an additional layer of security to the primary locking system on fifth-wheel assemblies, providing redundancy to prevent accidental uncoupling and to improve overall coupling integrity. The package targets regular maintenance and retrofit scenarios where wear or wear-induced looseness could compromise lock engagement. VMRS 059-001-043 places the component squarely in secondary locking mechanisms, while category 42784 aligns with standard fifth-wheel locking hardware. The Fifth Wheel product family attribute confirms compatibility with common fifth-wheel configurations used in regional and over-the-road fleets. Benefits include enhanced safety margins during high-dynamic loads, longer service life through controlled wear management, and straightforward field replacement that minimizes downtime. Operators can apply this kit during scheduled maintenance or after diagnostic checks reveal marginal latch performance, ensuring consistent performance across varying trailer weights and road conditions. Cross-references, when applicable, aid maintenance planners in selecting the correct replacement for specific build versions and wear states.