Sliding window balance spring ID

Quick Learner from Redlands, Ca

Feb 2, 2020 3:30 pm

Hello,

There is a patent # 5353,548 written on the plastic case. The design is similar to the series 140 but not identical. I could not find a name of the manufacturer only a logo.

Thanks for your help.

Peter

2 user uploaded images

4 Replies

Tom from SWISCO

Feb 5, 2020 12:10 pm

I don't believe that the Series 140 will work for you. Your pivot shoe looks more like our 15-087, which uses our Series 180 coil spring. You'll need the stamp off the old springs to confirm the best Series 180 option. Otherwise, I'm confident that this hardware is a better match. Look these parts over and let me know what you think!

Quick Learner from Redlands, Ca

Feb 5, 2020 2:39 pm

Hello,

I removed the spring and see that it is marked CMC 205 35" 7#. From this I think that I need a spring 35"long with a 7lb rating. Is the S 180-7 the spring that I need along with 15-087 coil housing pivot? (one each per side, two sets per window)

I watched the replacement video, and it suggests that I use two spreaders or cut the frame. My frames are aluminum, so I don't think that the spreaders will work. My only option in that case is to cut the frame or remove the window. Are these options my only choice?

Thanks,

Peter

1 user uploaded image

Tom from SWISCO

Feb 6, 2020 9:46 am

Hello again! Yes, if your old spring is marked with "7" then the S180-7 is absolutely what you want.

If your frames are aluminum and if you have no pre-existing cutout, then making the cutout yourself is your only option, yes. Our spreaders unfortunately will not work for aluminum windows.