Balance for single hung window

Home Owner from Orangevale, CA
Oct 30, 2023 11:50 pm
The silver part is 22 inches long.
IMG_20231030_203253511_HDR IMG_20231030_203332342_HDR IMG_20231030_203350447_HDR IMG_20231030_203356160_HDR IMG_20231030_203425987_HDR
5 user uploaded images
3 Replies
Emily
Emily from SWISCO
Nov 1, 2023 10:40 am
SWISCO
EXPERT

Hey there!

It appears you want either the Series 380 or Series 385 based on what I see in your photos. You'll have to measure as shown below to determine the best match. There should also be a stamp on the metal channel that will tell you what option you'll need to select for your replacements.

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

Home Owner from Orangevale, CA
Nov 1, 2023 11:45 am
I think that it is 1 3/32 inch...I will attach a photo. There are faint numbers on the back that we think say, "21 9 A1". Also does is matter that one edge looks rolled or hemmed?

How do I know which option to choose? 2110, 2120, 2130, 2140, or 2150?

Also, in the other two photos there are little bumps on one end and a screw and a bump on the other end...are these something I need to be concerned about having on the replacement?

Thank you for your help in finding the correct balance. My big box store was so NOT helpful.
Measuring Rolled or Hemmed edge IMG_20231101_084109263 IMG_20231101_084051185
4 user uploaded images
Emily
Emily from SWISCO
Nov 2, 2023 8:56 am
SWISCO
EXPERT

No the "hemmed" portion and the bumps you're referring to won't affect function. The number stamped on your balance represents the spring strength it's calibrated to support. Your 21 9 stamp is from an older rating system that we don't use so you'll need to weigh the window sash on a scale to determine the proper stamp. There's a chart under the product description on the S385-22 store page that will show which one is best for your replacements depending on the sash weight. 

I hope this is helpful! Let me know if you have any other questions.

Products and resources found in this discussion
Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
Current wait time is 3-4 business days
We promise that one of our experts will personally get back to you as soon as they are able. Thank you very much for your patience and understanding. If your inquiry is time-sensitive, please feel free to reach us at (888) 991-1929 or at help@swisco.com.
Need help identifying your part?
Send a photo or description to our Parts Experts!
Identify Your Part
SWISCO Part Experts