Coil Balances Replacement Parts

This looks potentially like our Series 170 and Series 171 Coil Balances. The video below explains more.

As the video above shows, if you have the Certainteed style Coil Balances, the bottom coil would be the Series 170 and the top coil would be the Series 171. A stamp of 8 might mean you need either the S170-408 8 pound spring. If in doubt, obtain the exact weight of the window sash and we can work it out for you. 

No worries, the questions aren't stupid at all. Window companies deliberately make replacing specific parts as difficult as possible, with the hopes you end up caving and buying new windows. The fact these coils aren't the same width give me some pause. Can you remove the pivot shoe they connect to at the bottom of the window and show us? The pivot shoe's identity will determine the coil balances needed. That, and the overall sash weight, should help ID everything you need.

It was good we checked! This looks like more like a 15-177 Shoe, which uses Series 152 Coil Balances. Compare to confirm. Again, if you need help confirming what stamp weights to select, give us the exact sash weight and we can work it out for you. 

So long as you subtracted your own weight from the weight you got on the scale, the remainder should indeed be the exact sash weight. In that case, you can use (2) of the S152-7 7 pound springs, one for each side of the sash. This equals 14 pounds of support overall; being within one pound of the exact sash weight should work fine. 

The good thing about coil balances is that you only need to replace the parts that are broken. If you would prefer to replace the covers as well or they are starting to break, you're welcome to purchase that 15-143, 15-144, and 15-145 used to support the S152 coils in the jamb.