5 lb Series 145 Balance Spring

This is a Series 145 coil spring for non-tilt windows.

Individually, this coil balance can hold 5 pounds. This is added together with the other coils to support the whole weight of the sash.

The weight you need should be indicated as a stamp or imprint on your old spring.

Measures 1/2" wide x 38-1/2" long.

This coil balance spring is sold individually, not in sets.

Can work for either the left or right side of the window interchangeably.

Coil balances are also known as constant force window balances.