21 12 OJ BSI

Quick Learner from Florida
I need to find the replacement for the following. It is stamped 21 12 OJ BSI. This is for a 48x48 window thats weighs prob around 30 pounds im thinking. 
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Emily
Emily from SWISCO
SWISCO
Expert

Hello there!

Thank you for reaching out to us. Your balance looks like it could be a match for the S351-22 or S390-22. The Series 351 has a 1" deep shoe and the Series 390 has a 1-1/8" deep shoe so you'll have to measure as shown below to determine the best match.

Your old stamp doesn't match up with any of our options, however. You will need to weigh the window sash and refer to the weight chart under the S351-22 and S390-22 store pages to determine the correct stamp. We do not recommend guessing or approximating the sash weight as that can result in difficulties when operating the window if you select the wrong stamp option.

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.

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