Coil Spring for window

Quick Learner from Missoula, MT

Apr 3, 2021 3:27 pm

Hi,

I'm looking to replace the coil springs in a window. It looks like it matches the s150, but I don't know the balance weight. A stamp on the coil says 840 (see photo if possible).

Thanks

Bob

1 user uploaded image

2 Replies

Emily from SWISCO

Apr 6, 2021 3:01 pm

Thanks for posting. The 840 stamp indicates that the coil supports 8 pounds and has 40" of travel. Could you confirm that your coil is 1/2" thick? If it is, you'll need the S150-8 coil. If you have any further questions please let us know!