One side channel balance is broken : SWISCO.com

Quick Learner from Maryland, US

May 14, 2026 11:13 am

Pictures of the working side and the broken side of a United Window 4201 tilt window. Which balance do I buy to replace the broken side?

3 user uploaded images

6 Replies

Emily from SWISCO

May 19, 2026 11:14 am

Thank you for reaching out to us. This balance looks to be a match for the Series 770. Can you tell us the stamp printed on the metal channel, as well as the length of the metal channel?

Quick Learner from Maryland, US

May 19, 2026 11:56 am

Thank you for your reply. Stamp appears to be 28C OF BS1 on the channels. It's a little hard to read. It is 28" in length.

Emily from SWISCO

May 19, 2026 12:59 pm

Thank you! Please see the S770-28 with the 28C stamp option for a sash weighing 18 to 23 pounds. If you need the shoe, take a look at the 15-129. Review the specifications and see what you think.

Detail of 15-129

Quick Learner from Maryland, US

May 19, 2026 1:25 pm

Thanks so much! I'll check them out.

Emily from SWISCO

May 19, 2026 1:43 pm

No problem! Please don't hesitate to reach out if you need anything else.