Balance with stamp I am unable to identify

Quick Learner from Vancouver WA

Sep 21, 2016 5:17 pm

Hi there,

I have a window balance that is stamped 21 S B.S.I. I believe it coordinated with the 351 series. Can you please help me confirm?

Thank you,
Amber

User submitted image of their window hardware.

4 Replies

Paul from SWISCO

Sep 26, 2016 12:47 pm

Hello, Amber. As long the bottom balance shoe has a depth of 1", then our S351-21 channel balance would be a good match. I haven't seen that kind of stamp in a long time. It's likely a very old balance. I believe 21S S might stand for a very strong spring, but I'm not sure. I recommend weighing your sash on a scale and referring to the chart we h ave on the S351-21 store page.

Quick Learner from Vancouver Wa

Sep 26, 2016 1:49 pm

Thanks for your help! Sometimes I have a hard time believing 1990 is a long time ago, but it is. My sash is 14 pounds, so it looks like the 2030 version is the one I need. The boot depth is an inch, so thank you for helping match up the right product.

Paul from SWISCO

Sep 28, 2016 12:45 pm

I agree with everything stated, including the sense that 1990 was only yesterday. Oh well, that's how it goes. Let me know if we can be of any more help!