needing replacement spiral balance for tilting window

A handy person from Brooklyn says:
hello,

my metal tubes are 12 3/8" long. the color of the balance tip is blue. the outer diameter of the metal tube is 5/8".
Spiral balance
Profile picture of Paul
Paul from SWISCO responded:
Since your tubes are 12-3/8" long, I would play it safe and go up to 13". Specifically, I recommend our S600-13. The reason you want to round up is to make sure the spiral reaches the bottom of the sill and doesn't come detached from the tube. You can afford a little extra length, but you can't get away with a little less.
How to replace a tilt window spiral balance.
How to replace a tilt window spiral balance.
VIDEO
WATCH >
How to Identify a Replacement Spiral Balance
How to Identify a Replacement Spiral Balance
VIDEO
WATCH >
How to choose the proper spiral balance tip color
How to choose the proper spiral balance tip color
GUIDE
READ >
How to adjust a spiral balance on a tilt window
How to adjust a spiral balance on a tilt window
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.