Gardner Spring 42-45-1750-S Extension Spring 0.42in Od

Product Description

The GARDNER SPRING 42-45-1750-S is a small-diameter extension spring designed for light-duty mechanical assemblies where precise force return and controlled extension are required. With an outside diameter of 0.42 inches, a wire diameter of 0.045 inches, and a maximum extended length of 0.71 inches, this spring delivers a spring rate of 4.43 pounds per inch and an initial tension of 0.71 pounds. It is sold in packages of 3 and is typically specified by mechanical contractors, equipment assemblers, and maintenance technicians working on compact mechanical or HVAC linkage systems.

This extension spring fits applications where a small-format, high-precision return spring is needed in tight housings or control linkage assemblies. Typical use cases include damper actuator linkages, control panel mechanisms, and small equipment assemblies found in residential and light commercial settings. The inside hook length of 1-3/4 inches allows for standard loop-end mounting in confined spaces. It is well-suited for OEM repair and preventive maintenance scenarios where exact spring specifications must be matched for reliable system performance.

Key Features

• Outside diameter of 0.42 inches suits compact mechanical assemblies
• Spring rate of 4.43 pounds per inch provides consistent, predictable return force
• Wire diameter of 0.045 inches for precise, lightweight spring tension
• Maximum extended length of 0.71 inches limits overextension in tight linkage applications
• Inside hook length of 1-3/4 inches enables standard loop-end attachment points
• Sold in packages of 3, suitable for stocking or single-job use

Compatibility

Designed as an OEM-style replacement extension spring for compact mechanical linkage and control assemblies requiring a 0.42-inch OD, 0.045-inch wire diameter, and 4.43 lb/in spring rate specification.

Installation Notes

Installation is typically performed by mechanical or HVAC technicians using standard needle-nose pliers or spring hooks to seat loop ends onto anchor points. De-energize or fully disable any actuator or mechanism before removing or installing extension springs to prevent unexpected movement. Do not overstretch the spring beyond its rated maximum extended length, as permanent deformation will affect spring rate accuracy. Follow applicable equipment service documentation for correct spring orientation and hook engagement.