Replacement balance spring for single hung window

Question

I believe it is a Starline window. The spring is broken. The balance spring assembly is labeled 17E.The metal channel is 18" long, 9/16" wide and 5/8" deep. The window sash weighs 19 pounds.  Thanks, Erwin Schroeder

Bob · Accepted Answer

See our S350-18. Carefully review the specifications and see if this channel balance matches what you need. For a new stamp option, 17E might conform to our stamp of 1750, which designates a balance that can support a window sash in the weight range of 17 through 20 pounds. If you're uncertain, weigh the sash to confirm.