Description

The PRIME LINE PRODUCTS SP 9730 is a double loop closed extension spring constructed from durable spring steel with a corrosion-resistant, nickel-plated finish. Each spring measures 5/8 inch outside diameter, 29/64 inch inside diameter, and 3 inches in length, with a wire diameter of 0.08 inches. The nickel plating allows for use in both indoor and outdoor environments. The spring is rated for a maximum safe load of 44.2 pounds and a maximum deflection of 1.34 inches. This listing includes two springs per pack. Handymen, maintenance technicians, and trade professionals install these springs in a wide range of residential and light commercial applications.

These extension springs are suited for use in screen doors, storm doors, cabinet hardware, light-duty machinery guards, and general mechanical assemblies where a reliable return force is needed. The closed double loop end configuration provides secure attachment to hooks, pins, or anchor points. The compact 3-inch length and 5/8-inch OD make these springs a common replacement in tight-clearance installations. The nickel-plated finish resists rust and surface degradation, extending service life in humid or outdoor-exposed environments.

Key Features

Double loop closed end design for secure hook and pin attachment
5/8 inch outside diameter and 3 inch length for compact fitment
Maximum safe load of 44.2 pounds
Maximum deflection of 1.34 inches
Nickel-plated spring steel finish for indoor and outdoor corrosion resistance
Sold as a 2-pack for common replacement needs

Compatibility

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

Installation Notes

Extension springs store energy under tension and should be installed and removed with appropriate hand tools to control release force. Disconnect or disengage the mechanical assembly from any power source or load before servicing. Ensure the mounting hooks or anchor pins are rated to handle the spring load before installation. Inspect attachment points for wear or deformation prior to fitting the replacement spring.