Prime Line Products Sp 9729 Extension Spring 3 Pack

Product Description

The PRIME LINE PRODUCTS SP 9729 is a double loop closed extension spring made from durable spring steel with a corrosion-resistant nickel-plated finish. Designed for general hardware and handyman applications, this spring measures 5/8 inch outside diameter, 1/2 inch inside diameter, and 2-3/4 inches in length, with a wire diameter of 0.054 inches. It handles a maximum safe load of 11.7 pounds and a maximum deflection of 0.77 inches. The nickel-plated finish makes it suitable for both indoor and outdoor installations. This package includes three springs.

This spring is suited for light-duty extension applications in residential and light commercial settings. Common uses include screen doors, storage hardware, cabinet latches, and general mechanical assemblies where a compact closed-loop extension spring is required. The corrosion-resistant finish extends service life in environments with moderate moisture exposure, making it a reliable choice for indoor utility rooms, workshops, and outdoor enclosures alike.

Key Features

• Double loop closed design for secure attachment at both ends
• Spring steel construction for consistent load performance
• Nickel-plated finish resists corrosion for indoor and outdoor use
• Maximum safe load of 11.7 pounds with 0.77 inch maximum deflection
• Compact dimensions: 5/8 inch OD, 1/2 inch ID, 2-3/4 inch length
• Sold as a 3-pack for value and on-hand backup

Compatibility

Designed as a general-purpose double loop closed extension spring suitable for a wide range of light-duty residential and commercial hardware applications requiring a 5/8 inch OD closed-loop extension spring.

Installation Notes

Extension springs store energy under tension and should be handled carefully during installation to avoid snapback injury. Use appropriate pliers or spring installation tools to seat the loops onto anchor points without overstretching the spring beyond its rated deflection. No special trade license is required for general hardware installation, but always confirm the anchor points can support the rated load before placing the spring in service.