Need help finding this Window Balance

Question

Hi Swisco team, I need help finding this part.  I need the complete window balance so it's ready to install. The total length is 31 inches.  Width is 9/16" and height is 11/16". Please see pictures I need 6 of them. There is a stamping that says "30 3BSI" on one of the pictures.  Thank you.

Casey · Accepted Answer

Hello,

With this combination of attachments, you could have either an S380-31 or S385-31 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. You'll also need a 3030 spring strength option for your replacement balances.

Thank you and let us know if you have any other questions or concerns.

Comparison of the S378, S380 and S385 balance shoes.