840 S190 COIL BALANCE SPRING too loose for my window

Quick Learner from MD

Feb 14, 2020 8:47 am

I bought replacement 840 S190 COIL BALANCE SPRING.
But my window is still too loose.
Can I use other coil spring to make my window tighter?

4 Replies

Casey from SWISCO

Feb 14, 2020 4:01 pm

Hello,

Individually, this coil balance with an 840 stamp can hold 8 pounds. That means that if you have one coil on each side of the window, it will support a 16-pound window sash. If your window weighs more than 16-pounds, that would explain why your window is still sagging. Could you weigh the window sash and get back to us so that we can get to the bottom of this for you? Thank you!

Quick Learner from MD

Feb 16, 2020 9:51 am

Thank you Casey.
One of the window is 19 pounds. Another window is 19.4 pounds,

But the original springs have stamps of 840.

Should I change springs?

Casey from SWISCO

Feb 17, 2020 1:56 pm

For your sash weights, I'd suggest using an S190-940 coil spring on each side of the window. The added strength will provide extra support to keep your sash raised. Thank you.