Parts for double pane windows

Thanks for your post! The stamp from the balance tells us the weight range the balance may be able to support but it does not tell us the series, unfortunately. If this is something you are looking to replace, I'll need to see clear photos of the top and bottom attachments to identify it.

The top sash guide reminds me of the 18-166. Take a look over the dimensions and compare them to determine if this is a match.

Detail of 18-166

Profile view of 18-166

Yes, they help. You'll need either the S380-30 or the S385-30. To confirm the correct series, you'll need to measure the depth of your bottom shoe.

The 2940 stamp should work to replace yours but it would be a good idea to double check that the sash weight falls between 23 to 28lbs.

Comparison of the S378, S380 and S385 balance shoes.