Single Hung Window balance springs

Home Owner from FL
window frames are 31.75" (H) x 51.5 (W)
Stamp on balance spring   29  5  3 SI RM
Length of aluminum without tips:  30"
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2 Replies
Bob
Bob from SWISCO
SWISCO
Expert

Thanks for posting. This looks like an S380-30 or S385-30 Channel Balance. The only difference between these two balances is the 'depth' of the bottom nylon shoe, or 'heel-to-toe' measurement. See the diagram below for reference. Measure your old balance's shoe to see what matches best. For a stamp option choose 2950. Let me know if you have other questions.

Comparison of the S378, S380 and S385 balance shoes.
Comparison of the S378, S380 and S385 balance shoes.

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