Windows balance spring

Thanks for posting. I am confident we can help replace this channel balance, but that stamp is not an identifier. It simply tells us the balance's strength. Please remove the balance from the window and send photos of the nylon attachments at both ends. Also, please give us the exact weight of the window sash that the balance supports. A bathroom scale should suffice. We'll do our best to ID what you need from there.

Thanks! Based on what I see here, you have either our S380-27 or S385-27, depending on the depth of the bottom shoe. That's the only difference between them. I recommend measuring your shoe and referring to our dimensions to confirm the best match.

For a 34 pound sash, you can use the 2665 option. Two balances with this stamp can carry a load of 33 through 36 pounds.

Comparison of the S380 and S385 balance shoes.