Replacements balances

Question

Both balances on my window have broken and need to be replaced. They no longer support the window and they don't stay put either.

Bob · Accepted Answer

Hello there. Is the metal channel 33" long, not including the end attachments? If so, this is either an S351-33 or S390-33. The only difference between these two channel balances is the 'depth' of the bottom nylon shoe, or the 'heel-to-toe' measurement. See the diagram below for reference. Compare both balances with your old hardware to see what matches best.

Comparison of the S351 and S390 balance shoes.

You then have to choose a stamp option, which reflects the strength of the balance. Look for a stamp on the metal channel that designates this. If there is no stamp, or you're unsure, weigh the window sash the balances support. You can then use that exact weight to pick the right stamp option. Let me know if you have further questions.