unstamped balance strength

A handy person from california says:
March 25, 2019
377 series 19" x 1/2" balance. 9" inside spring. double paned aluminum window. uploading photos did not work. How balance spring strength related to window weight, eg, 1.5x or 0.75x each?
Profile picture of Tom
Tom from SWISCO responded:
March 27, 2019

Thanks for contacting us! We actually have a chart on the S377-19 store page that tells you how much weight each option supports. All you have to do is weigh your sash on a scale and refer to that chart.
19" Series 377 Channel Balance
19" Series 377 Channel Balance
S377-19
$9.34
How to Replace a Non-Tilt Channel Balance
How to Replace a Non-Tilt Channel Balance
VIDEO
WATCH >
How to Repair a Jammed Window
How to Repair a Jammed Window
VIDEO
WATCH >
How to Identify Replacement Channel Balances
How to Identify Replacement Channel Balances
VIDEO
WATCH >
How to replace a non-tilt channel balance
How to replace a non-tilt channel balance
GUIDE
READ >
Choosing a Non-tilt Channel Balance: What Will We Need?
Choosing a Non-tilt Channel Balance: What Will We Need?
GUIDE
READ >
Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
(your email address will be kept private and is only used to inform you when a response has been made)
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.