Single hung window balance spring Replace

Home Owner from Phoenix
Jan 24, 2025 4:41 am
When opening window both springs dropped out. Stamp is BSI 21 3. Looks like shoe might be just over 1 inch. These are 20 years old. What model is replacement?
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2 Replies

Jasmine from SWISCO
Jan 24, 2025 3:17 pm


This window balance can be replaced with the S390-22 Channel Balance. Like yours, it is a wingless assembly with a 1-1/8" shoe depth.
You can likely use the 2130 stamp option but it may be a good idea to double check that your sash weight falls between 12 to 15lbs.
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