SWISCO - The Replacement Hardware Authority

How to read stamp on balance spring

A quick learner from California says:
How do I know what stamp option I need? The old spring has "26 5 LU CMC 1" stamped on it. It is a 1/2" channel, 27" long spring. Thanks!
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Tom from SWISCO responded:
Thanks for posting! A stamp of 26 5 usually corresponds to our 2650 option. Does the weight of your sash match the rating shown for the 2650?
A quick learner from California says:
No. The sash is only 21 lbs. I went ahead with the lower weight one rather than the 2650. Thank you!
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