4.5 lb 1/2" Coil Spring Universal Window Balance 1-1/4"

Coil Spring 1/2" Constant Force, 4.5 lb, 1-1/4" Universal Window Balance

This universal constant force coil spring is designed for use in single or double hung sliding windows with a 1-1/4" (31.8mm) pocket width. The coil itself measures 1/2" (12.7mm) thick and provides a weight capacity of 4.5 pounds (2.0kg) per coil. It is suitable as a replacement part for window balance systems that use constant force technology, helping to ensure smooth and consistent sash operation.

This coil spring is sold individually as a coil only. It can be combined with other compatible components such as support covers, brake shoes, and pivots (sold separately) to create or repair a window balance system. Multiple coils can be paired together or mixed with coils of different weight ratings to match the specific sash weight requirements of your window. The coil is available in several other weight capacities, including 3.5 lb, 5.5 lb, 6.5 lb, 7.5 lb, and 9 lb options for versatility across different window models.

Technical Information

• Pocket Width: 1-1/4" (31.8mm)
• Coil Thickness: 1/2" (12.7mm)
• Weight Capacity: 4.5 lbs (2.0kg) per coil

Notes

• Sold as a single coil only; additional parts (covers, shoes, pivots) are available separately.
• Available in a range of weight capacities for custom assembly.
• This coil is compatible with universal sash balance systems using a 1-1/4" pocket.

Carefully measure your existing hardware—especially pocket width and coil thickness—to ensure the correct fit before ordering. Double-check all measurements for accuracy prior to purchase.