Window Balance Spring

Question

This is my window balance spring which is 27" long and 1/2 channel. Please let me know the replacement for this?

Thanks,
Mark

Casey · Accepted Answer

Hi Mark,

With this combination of attachments, you could have either an S380-27 or S385-27 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 to locate the stamp on your metal channel to choose the corresponding spring strength option.

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

Comparison of the S378, S380 and S385 balance shoes.