Anderson Window balancer

A quick learner from Rhode Island says:
May 1, 2017
Please identify which replacement I need. I need to replace both sides. 11600- 2 C85 6#23 183
User submitted photos of a window balance.
A quick learner from Rhode Island says:
May 1, 2017
Visible glass chart suggests replace with 737, however the guidance I see that you provided to someone else indicates the based on marking this should be 637. what's the real difference between the 2?
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Tom from SWISCO responded:
May 3, 2017
The difference between them is how much weight they can support. Glass size isn't the most reliable way to identify a balance. There are multiple variables that are very difficult to account for. Going by your stamp of "6#23" I would recommend the 24-637.
Andersen Sash Balance, 623, 627, 631, 637
Andersen Sash Balance, 623, 627, 631, 637
24-637
$54.20
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