SWISCO - The Replacement Hardware Authority

Please help me identify this part

A handy person from Camarillo ca says:
Hi
I need 32" balancer for a milgard non foldout window. 1/2" wide.
Attracted are pictures of the ends. Could you please help me with the correct replacement.
Thank you.
User submitted photos of a window balance.

26 5 BS CALDWELL
Profile picture of Donna
Donna from SWISCO responded:
This looks a lot like our Series 385 channel balance. However, usually a balance with a stamp of 26 5 measures 27", not 32". You may want to double check the length of the metal channel just in case.
A quick learner from Camarillo says:
Thank you for the response.
Yes you are correct. I re-measured and it is 27".

I will order series 385.

What do the options 2610, 2620,.....etc mean? which option do I pick?

Thanks again.
Profile picture of Donna
Donna from SWISCO responded:
You likely need the 2650 stamp option, to check, remove the window sash and place it on a scale. A pair of S385-27 with stamp 2650 will carry a window sash weight range of 26 though and including 30 pounds.

This information is based on 2 balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate.
A quick learner from Camarillo ca says:
Thank you.

I weight the sash. It was 25.5 lbs. Is it close enough to go with 2650?

Regards,
Profile picture of Tom
Tom from SWISCO responded:
You should probably go with the 2640 option, since your sash weight is just under 26 pounds.
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