Window Balance - Help : SWISCO.com

Quick Learner from Fullerton, CA

Dec 22, 2025 9:41 pm

Hello, I believe this is the S351, but wanted to get your feedback first. It is the 1/2 width and 12 inches. Can you please help me identify so that I can order the correct balances?
Thank you.

2 user uploaded images

6 Replies

Bob from SWISCO

Dec 28, 2025 4:26 pm

Thanks for posting. Could you double-check the metal channel length? I suspect it is 13" long, not 12". We'll narrow this down from there.

Quick Learner from Fullerton, CA

Dec 29, 2025 6:41 pm

You are correct, it is 13 inches - idiot me...

1 user uploaded image

Bob from SWISCO

Dec 30, 2025 3:39 pm

No worries at all! Common mistake because the stamp would suggest otherwise. I believe you have either an S351-13 or S390-13 Channel Balance, depending on the depth of the bottom nylon shoe. See below. Measure your old balance's shoe depth to see what matches best. For a stamp option choose 1240.

Comparison of the S351 and S390 balance shoes.

Quick Learner from Fullerton, CA

Dec 31, 2025 3:28 pm

Awesome! It is 1 1/8. Will place the order now.
Thank you so much!

Bob from SWISCO

Jan 2, 2026 3:28 pm

Glad to help! Let us know if you have further questions.