i need window balances for several milgard vinyl windows, 10 years old

Quick Learner from claremont ca
the attached image show the stamp on the existing balances - which SWISCO part is a replacement?
User submitted a photo of a window balance.
8 Replies
Tom
Tom from SWISCO
SWISCO
Expert
I'm afraid I cannot determine what Series you have based on just the stamp. I will also need to see the top and bottom nylon attachments. Also, can you confirm the weight of your sash? Looking at the stamp, I would assume it's 39 pounds, but I would like you to confirm just in case. Thanks!
Quick Learner from claremont ca
it looks like series 380 or 385, based on the end attachments. the sash does appear to be about 40 pounds
Tom
Tom from SWISCO
SWISCO
Expert
Great! Both those Series have stamps that can carry that weight, so all you need to do is confirm which you have.
Quick Learner from Claremont
Ok, how do I do that? The pictures look the same to me.
Tom
Tom from SWISCO
SWISCO
Expert
The key difference between the Series is the size of the bottom shoe. You need to measure your own, then compare your measurements to ours to determine which is a better match. We have detailed measurements on each product's store page.
Quick Learner from claremont ca
OK, the shoe is 15-004, so it's series 385.

How do you measure the length of the balance - just the metal part, or from plastic tip to plastic tip?

And do I have a problem if the actual weight of the sash is 39 pounds when the weight range maxes out at 34? It's a Milgard window, but there's leaded glass sandwiched inside the double panes. I'm guessing that's where the high weight comes from.
Tom
Tom from SWISCO
SWISCO
Expert
You only measure the metal channel. Based on your stamp, I would guess it's 33".

The S385-33 has two stamp options that can cover 39 pounds. I recommend weighing yours on a scale to get a more exact weight so that you can determine which is better: the 3265 (35 to 39 lb) or 3270 (39 to 42 lb).
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