Gardner Spring 36-41-3500-S Extension Spring

Product Description

The GARDNER SPRING 36-41-3500-S is a small-format extension spring designed for light-load tensioning and return-force applications across industrial, HVAC, and mechanical assembly environments. It features a 0.36-inch outside diameter, a 0.041-inch wire diameter, and a spring rate of 1.57 pounds per inch. The maximum extended length is 0.61 inches, with an initial tension of 0.61 pounds. This spring is typically installed by maintenance technicians, HVAC service professionals, and mechanical assemblers requiring precise, repeatable return force in compact hardware configurations.

The 36-41-3500-S is suited for light-duty tensioning tasks in residential and commercial HVAC equipment, control linkages, damper assemblies, and general mechanical subassemblies where a small-diameter extension spring with consistent spring rate is required. The inside hook length of 3-1/2 inches accommodates standard hook-and-loop mounting configurations. This part ships in a package quantity of three units, with a minimum order quantity of one.

Key Features

• 1.57 lb/in spring rate delivers consistent, predictable return force
• 0.36-inch outside diameter fits compact mounting envelopes
• 0.041-inch wire diameter provides light-load tensioning performance
• Maximum extended length of 0.61 inches for short-travel applications
• Inside hook length of 3-1/2 inches supports standard hook mounting
• Package quantity of 3 units reduces per-unit cost on small jobs

Compatibility

Designed as an OEM-style replacement or service component for light-duty extension spring applications in HVAC control linkages, damper assemblies, and general mechanical hardware where a 0.36-inch OD, 0.041-inch wire diameter extension spring is specified.

Installation Notes

Extension springs of this size are typically installed by HVAC technicians or mechanical maintenance personnel. De-energize or shut down the equipment before removing or installing any spring components. Use appropriate hand tools and eye protection when handling and stretching extension springs, as stored energy can cause injury if the spring slips during installation. Verify hook engagement and alignment before returning the assembly to service.