Window Balance.

Home Owner from WA
Jan 1, 2025 7:49 pm
I need to replace three pairs of window balances. On the front of the frame is BSI 2130.
4 user uploaded images
4 Replies

Bob from SWISCO
Jan 1, 2025 9:13 pm


Hello there. It looks like you have either an S351-22 or S390-22 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. Measure your old balance's shoe depth to see what matches best. In either case for a stamp option choose 2130.

Comparison of the S351 and S390 balance shoes.

Home Owner from WA
Jan 2, 2025 2:05 pm
I think it is a S 390.
Total lenght +23" Lenght of the metal frame =22"
Total lenght +23" Lenght of the metal frame =22"

Bob from SWISCO
Jan 2, 2025 2:50 pm


We measure channel balance length on just the metal channel, without including the end attachments. So if you are confident it is a Series 390, then you'd need the S390-22, stamped 2130. Let me know if you have further questions!
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