Hillman Fasteners 540054 Extension Spring 6 Pack

Product Description

The HILLMAN FASTENERS 540054 is a No. 18 extension spring designed for general-purpose tensioning applications across a wide range of trades and industries. Built from steel with a zinc finish for basic corrosion resistance, this spring follows a standard extension spring design, providing reliable pull-back force when stretched beyond its natural length. The pack includes 6 springs, each supplied in a poly bag. This type of hardware is commonly installed by HVAC technicians, plumbers, electricians, and general contractors wherever a conventional extension spring is required.

Extension springs like the 540054 are used in residential and light commercial settings for door assemblies, HVAC damper linkages, equipment panels, and general mechanical tensioning tasks. The zinc finish makes these springs suitable for dry to mildly humid indoor environments. The 6-unit pack format is practical for service technicians who carry common hardware on the truck or for shop stock replenishment.

Key Features

• Standard extension spring design for conventional pull-back tensioning
• Steel construction with zinc finish for basic corrosion resistance
• Versatile fitment across a broad range of mechanical applications
• Sold as a 6-pack in a poly bag for convenient storage and use

Compatibility

Designed as a general-purpose replacement or new-install extension spring suitable for a variety of mechanical assemblies where a No. 18 standard extension spring is specified.

Installation Notes

Extension springs store energy under tension and should be installed and removed with appropriate hand tools to prevent uncontrolled release. Always de-energize or relieve system load before replacing a spring in a mechanical assembly. Follow applicable local codes and equipment manufacturer guidelines when installing springs in HVAC, plumbing, or electrical enclosure applications.