Gardner Spring 42-45-2500 Extension Spring 0.42in Od

Product Description

The GARDNER SPRING 42-45-2500 is a close-wound extension spring designed to resist pulling forces and return components to their original position when tension is released. Built with a 0.045 inch wire diameter and a 0.42 inch outside diameter, this spring delivers a spring rate of 2.9 lb/in with an initial tension of 0.82 lb. The free length measures 2.5 inches, and the maximum extended length is 0.82 inches beyond the hook engagement point. It ships with a plain, uncoated finish suited to a wide range of mechanical assemblies. HVAC technicians, plumbers, and mechanical service professionals encounter extension springs like this in damper linkages, access panel latches, valve assemblies, and other tension-return mechanisms found in trade equipment.

This spring is appropriate for light-duty tension applications in residential and light commercial mechanical systems. Common install scenarios include HVAC damper actuator assemblies, control panel door closures, and small appliance linkages where consistent return force and a compact form factor are required. The 2.9 lb/in spring rate makes it suitable for low-load, precision-return applications. Package quantity is 3 units per pack, with a minimum order quantity of 1 pack.

Key Features

• Spring rate of 2.9 lb/in for consistent, predictable return force in light-duty tension applications
• 0.42 inch outside diameter and 0.045 inch wire diameter for compact fitment in tight assemblies
• 2.5 inch free length with inside hook design for straightforward loop or hook attachment
• Initial tension of 0.82 lb provides slight preload to keep components snug before full extension
• Plain finish allows post-installation coating or use in dry, low-corrosion environments
• Sold in packs of 3, minimizing downtime when a replacement is needed on the job

Compatibility

Designed as an OEM-style replacement extension spring for light mechanical assemblies requiring a 0.42 inch outside diameter, 2.5 inch free length, and 2.9 lb/in spring rate.

Installation Notes

Extension springs should be installed by a qualified technician familiar with the mechanical assembly being serviced. De-energize all electrical circuits and relieve any system pressure or tension before removing the existing spring. Use appropriate pliers or spring hooks to seat the end loops or hooks without overstretching the spring beyond its maximum extended length. Overstretching an extension spring permanently deforms the coils and reduces return force.