Window spring

Thanks for your post! This window balance reminds me of the S380-27 or the S385-27. To determine which series is the correct replacement, you'll need to look over the specifications and compare them.

Our 2640 stamp should work in the window. A pair of these will support a sash weighing 19 to 26lbs.

Comparison of the S378, S380 and S385 balance shoes.