Prime Line Products F 2538 Window Sash Spring 2-pack

Product Description

The PRIME LINE PRODUCTS F 2538 is a window sash spring sold as a 2-pack replacement component for hung window assemblies. Sash springs provide the tension that holds single- or double-hung window sashes in position, counterbalancing the weight of the sash so it stays open at any height. These springs are installed by glaziers, carpenters, and general contractors during window repair or renovation work. The pack quantity of two makes it practical for servicing both the left and right channels of a single window in one purchase.

This part is suited for residential window repair applications where worn, broken, or weakened sash springs need to be replaced. Sash spring failures typically show up as windows that will not stay open, slam shut under their own weight, or feel unusually stiff when raised or lowered. The F 2538 is appropriate for use in standard hung window frames where channel-mounted sash springs are the original tensioning mechanism.

Key Features

• 2-pack quantity covers both channels of a single window in one order
• Designed as a direct replacement for worn or broken sash springs in hung window assemblies
• Lightweight construction at 0.185 pounds per pack for easy handling during overhead or confined-space installation
• Restores proper sash tension to keep windows open at the desired position

Compatibility

Designed as an OEM-style replacement for channel-mounted sash springs in standard single- and double-hung residential window frames.

Installation Notes

Sash spring replacement is typically performed by carpenters, window repair technicians, or experienced DIYers. Before beginning, lower the sash fully and secure the work area to prevent uncontrolled sash movement during spring removal. Proper spring tensioning is critical — follow the window manufacturer's guidance for the correct number of turns before seating the spring in the channel. Ensure both springs in the pack are installed with equal tension to prevent the sash from binding or racking in the frame.