Window balancer part identification

Question

I need to replace 4 window balancers.  There are no markings on any of them.  The length of the metal part of the balancer is 30".  I have attached 3 pics of the balancer and one pic of the sticker on the top edge of the window.  Please let me know what I need to buy and how much those would cost through your company.

Bob · Accepted Answer

Hello there. This looks like either an S380-30 or S385-30. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement, so compare both with your old hardware to see what matches best. See the diagram below for reference.

Comparison of the S378, S380 and S385 balance shoes.

You then have to choose a stamp option, which reflects the strength of the balance. Since your old balances lack stamps, the best thing to do is to weigh the window sash these balances support. You can then match that exact weight with one of the weight ranges listed alongside each stamp option under the product description of either the S380-30 or S385-30 shop page.