Gardner Spring 431C Extension Spring 0.75in Od 31.18lb

Product Description

The GARDNER SPRING 431C is a steel extension spring designed to resist pulling forces and return components to their original position under load. It features a 0.75-inch outside diameter, a wire diameter of 0.0915 inches, and a spring rate of 12.6 pounds per inch. The overall body length is 4.0 inches, with a maximum extended length of 31.18 inches and a maximum work load of 31.18 pounds. A zinc-plated finish provides corrosion resistance for both indoor and light-duty outdoor applications. Double-loop ends allow for straightforward hook-and-pin attachment in a wide range of mechanical assemblies. HVAC technicians, equipment mechanics, and maintenance professionals install this type of spring in control linkages, door assemblies, damper mechanisms, and similar tensioning applications.

This extension spring is suited for light commercial and residential mechanical systems where a compact, reliable tensioning element is required. Typical installation scenarios include HVAC damper return mechanisms, equipment access door latches, and general-purpose control linkages. The double-loop end configuration supports fast connection to standard pins, hooks, or brackets without additional hardware. At a 4.0-inch body length and 0.75-inch outside diameter, it fits in tight equipment cavities where space is limited.

Key Features

• 0.75-inch outside diameter fits standard spring pockets and brackets
• 12.6 lb/in spring rate delivers consistent, predictable return force
• Maximum work load of 31.18 pounds suits moderate-tension applications
• Double-loop ends allow quick attachment to pins, hooks, or anchor points
• Zinc-plated steel construction resists corrosion in typical mechanical environments
• Compact 4.0-inch body length installs in space-constrained assemblies

Compatibility

Designed as an OEM-style replacement or direct-fit extension spring for mechanical assemblies requiring a 0.75-inch OD, double-loop steel spring with a 12.6 lb/in spring rate and up to 31.18 pounds maximum work load.

Installation Notes

Mechanical technicians and HVAC service professionals typically install extension springs of this type. Before servicing any assembly, de-energize all electrical systems and relieve any existing mechanical tension per equipment manufacturer procedures. Use appropriate pliers or spring hooks to seat loops onto anchor pins without overstretching the spring beyond its maximum extended length. Never extend the spring beyond 31.18 inches, as exceeding the rated maximum extended length can cause permanent deformation or failure.