Identify Channel Balance

Question

Balance is 1/2 in width (9/16th) and 29" long. It's marked on one side with 28B USB
They are non tilt windows. I'm not sure the exact weight of the window.

Bob · Accepted Answer

Thanks for posting. This looks like either an S380-29 or S385-29 Channel Balance. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement. See the diagram below for reference. Compare both with your old balance to see what matches best. For a stamp option choose 2820.

Comparison of the S378, S380 and S385 balance shoes.