Gardner Spring 42-45-2500-S Extension Spring

Product Description

The GARDNER SPRING 42-45-2500-S is a small-diameter extension spring rated at 2.52 pounds per inch of spring rate, designed for light-duty tension and return applications across mechanical, HVAC, and equipment assemblies. With an outside diameter of 0.42 inches and a wire diameter of 0.045 inches, this spring delivers consistent pull force in compact spaces. The maximum extended length is 0.71 inches, and initial tension is rated at 0.71 pounds. It is sized for installations where precision spring performance is required in tight clearances. Typically installed by HVAC technicians, mechanical assemblers, or equipment maintenance professionals working on damper linkages, actuator mechanisms, or light-load return systems.

This extension spring is suited for residential and light commercial applications where a small-format, consistent-rate tension component is needed. It fits damper return mechanisms, control linkages, and similar assemblies that require a reliable spring-back force within a confined form factor. The inside hook length of 2-1/2 inches allows for straightforward mounting to standard hook or loop anchor points. Sold in a package quantity of three units, making it practical for service kits or replacement stock.

Key Features

• 2.52 lb/in spring rate for consistent, predictable tension force
• 0.42 inch outside diameter fits compact mechanical housings
• 0.045 inch wire diameter for light-duty load handling
• 0.71 inch maximum extended length for short-stroke applications
• Inside hook length of 2-1/2 inches for standard anchor-point mounting
• Packaged in quantities of three for service stock convenience

Compatibility

Designed as an OEM-style replacement or service component for light-duty extension spring applications in HVAC damper assemblies, mechanical linkages, and similar equipment requiring a 0.42 inch OD tension spring with a 2.52 lb/in spring rate.

Installation Notes

Installation is typically performed by HVAC technicians or mechanical service professionals. Power down and de-energize any associated equipment before removing or installing springs in actuator or damper linkages. Use appropriate pliers or spring hooks to seat the end loops without overstretching the spring beyond its rated extended length. Verify anchor points are secure and free of corrosion before reinstalling.