Window balance

Hello,

With this combination of attachments, you could have either the S380 or S385 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. I'd also suggest double-checking the length of the metal channel as shown below, which should be 28" without the end fittings.

How to measure the length of the Series 385 channel balance.

You'll also need 2740 spring strength options 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.

As long as the end fittings are the same, you would need 2730 strength options to replace the 27 3 stamped balances, which will support a sash between 13-19 pounds.