Certainteed coil balance assembly replacement

Question

I need assistance in finding the right part for the coil balance assembly to a Certainteed window. The sash no longer stays up when the window is open lifting the sash. The each coil has a number 6 written on it and it is and half inch wide and the sash weight about 20.2 lbs.  I am not sure which parts to order.

Casey · Accepted Answer

Hello,

Your pivot shoe resembles the 15-192 made by Certainteed, which uses the S170 and S171 springs.

The 6 stamped on your springs would normally lead me to believe that you would need the S170-406 and S171-406 coils, but that would support more than 20 pounds. If you're confident in your sash weight, you may be better off using one S170-405 and S171-405 on each side to support exactly 20 pounds. Thanks for posting.