Coil balance

A home owner from Philadelphia, Pa says:
I have previously ordered window parts from Swisco over the past years.My window sash weighs 18.37 lbs approx. & has a S160-9 coil balance spring with the 15-111 pivot shoe & 15-150S single support installed with it. Because the springs have broke previously can I install a 10 LB. coil spring instead of the 9 LB. S160-9. If so what are the part numbers for that coil balance spring & the corresponding pivot shoe & single support, Thank You.
Profile picture of Paul
Paul from SWISCO responded:
Hello! For a 18.37 lbs. sash, I would stay with the S160-9. Since the true weight of the spring is 9.5 lbs., two should be more than enough to carry your sash weight. You can reuse your 15-111 if it is not broken.
How to replace a window coil balance
How to replace a window coil balance
VIDEO
WATCH >
How to Replace a Triple Coil Balance System
How to Replace a Triple Coil Balance System
VIDEO
WATCH >
How to remove window pivot shoes
How to remove window pivot shoes
VIDEO
WATCH >
Anatomy of a tilt window
Anatomy of a tilt window
VIDEO
WATCH >
Removing a Triple Coil Window Balance
Removing a Triple Coil Window Balance
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.