window coil balances

Hi, Kun. I don't know if this is a Series 140, but I have my doubts. In order to confirm, can you show me a picture of the pivot shoe to which the coils connect? That will allow me to pretty much identify everything else you need.

Thanks! That looks like our 15-111 pivot shoe, which is designed to be used with the Series 160 spring. Assuming everything is in good condition then all you'd need is new Series 160's.

I'm not sure what weight option you need. You would need to match up the stamp printed on the old spring to confirm. It should be right on the flat face of the spring, by the screw hole. While you have your spring out, I also highly recommend measuring its thickness. The Series 160 is 1/2" thick. If yours isn't, let me know and we can try to find a better match.

Otherwise, the Series 160 is designed to work with a cover like the 15-150D. This is made for two springs, which it looks like you have, but you should take yours out of the window to confirm first. You'll have to take it out anyway to get the stamp.

The coil balance manufacturers all changed over to 35" length springs to reduce their inventory. When installing the new coil balances for the lower sash, they suggest mounting the 15-150D (with the two S160-4 inside) just below the top tilt latches when the sash is completely closed.

Also, since you have two coil springs on each side of the sash I suggest the heavy duty 15-191 pivot shoe.

You want to put them even lower than the green circle, in fact. Take note of the tilt latch at the top of the bottom sash. You want the coils to mount under those latches' lowest position; otherwise, when you open and close the window, the tilt latches will bump into the coil springs and your window won't work properly. That's why manufacturers put them so high to begin with but they've taken the opposite course in recent years.