1980s aluminium window balance spring parts

Question

I have a single hung window that doesn't tilt. It is a 1/2" channel. Channel is 28" in length. But besides that I'm having trouble determining which of your channels match mine. Thanks!

Bob · Accepted Answer

Thanks for writing in. See our S380-28 or S385-28. The only difference between these two balances is the 'depth' of the bottom nylon fitting. Compare both with your old hardware to see what matches best. You will need to select a stamp option. Look for a stamp code on your balance's metal channel. If there is none, weigh your window sash. You can then match that exact weight with one of the weight ranges listed alongside each stamp option on the product page.