XB-09517-1
Extension Spring
SAF-Holland

Left-hand orientation extension spring provides tension within a linkage or actuator assembly that requires opposite-handed components on the left side of the vehicle system. Its role is to store energy and apply return force to keep moving parts in a defined position after actuation. VMRS code 059-001-029 identifies it within the extension-spring family for specific installation directions. Category 42810 groups items used in specialized fifth-wheel and related control assemblies. When installed correctly, it contributes to smooth, predictable actuation of release mechanisms and locking pins, reducing sticking, flutter, or misalignment during engagement. The left-hand configuration matters in mounting geometry, ensuring hook ends align with anchor points and other hardware tolerant of directional loads. In service, inspect for corrosion, fatigue-induced changes in coil diameter, and ensure proper preload to maintain reliable operation across diverse operating conditions. This part is designed for rugged environments and long service life, making it a dependable choice for critical actuation and safety-critical fastening systems in heavy-duty applications.