Need new channel balances

A quick learner from california says:

April 22, 2024

I need to replace some channel balances

I think the measurements are: 17 pounds, 1/2" channel width, metal length of balance is 27", the fittings have wings on both ends, I think the bottom shoe is slightly more than an inch.
The marking on the balance shows "26 3 BSI 00"
Please see pictures.

I think I need the S385 with a 27 inch length. But possibly the S380.
I'm not sure about the options. I'm assuming that with the marking on the metal I would need the 2630 option, but it looks like that one is sold out. Would a 2620 work? or a 2640? I'm not sure what these numbers refer to so I don't know how to choose.

Thumbnail of the uploaded file named Channel width

Thumbnail of the uploaded file named Bottom fitting

Thumbnail of the uploaded file named Stamp code

Thumbnail of the uploaded file named Shoe depth

Thumbnail of the uploaded file named Channel length

Casey from SWISCO responded:

April 23, 2024

Hello,

We are not able to make out exact dimensions from photos but your bottom fitting does appear to be over 1" deep. If so, you would need the S385-27 (2630) channel balances. The 2630 option would be required for your replacements since it indicated that the spring tension will be calibrated to support a sash between 13-19 lbs. Getting a stronger or weaker option will inhibit the functionality of the window and could lead to damage in some cases. If the specifications match up to yours, I'd recommend signing up to be auto-notified on the S385-27 product page to receive an email as soon as the 2630 balances are back in stock. Thank you!

Comparison of the S380 and S385 balance shoes.

27" Series 380 Channel Balance

S380-27

$10.55

27" Series 385 Channel Balance

S385-27

$10.55

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