Window balance springs broken

Question

I'm sorry I found no making on parts and nothing to describe brand of window.
This is a 35 x 52 inch single hung window I was surprised it had double springs.

Jasmine · Accepted Answer

Thanks for posting! Your coil balance pivot shoe looks like our 15-111. Carefully compare the measurements to your existing pivot shoe to confirm that this is the right fit.

Alternate image for 15-111

The compatible coil spring is the Series 160 Coil. To determine exact which spring is needed for your window, you'll need to obtain the exact weight of your window. Once you have the weight, you'll need to divide it by the total number of coils in the window. This will give you the spring strength needed for each coil.

The cover is part 15-150D.