channel balance

A home owner from Ventura, CA says:
This is a channel balance for a single hung window. The markings say 2035. I'm having troubles knowing exactly how to match it up to the Series markings.

I'm thinking I need a 20" Series 351, option 1940 to match this. Is this correct? Thanks!

Profile picture of Tom
Tom from SWISCO responded:
Hello! The stamp actually does not correspond to our Series, all it tells you is how strong the spring is. That said, your stamp is actually a little peculiar, so I'm not even sure what that might be.

The best way to confirm if the Series 351 is a match is to carefully compare the nylon attachments that come with it (19-002 and 15-002) to your own. I would also measure your metal channel to ensure you get the proper length. Yours might be 21", not 20". As for the stamp, I recommend weighing your sash on a scale.
Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
(your email address will be kept private and is only used to inform you when a response has been made)