Help identifying parts and size

Thanks for writing in. This looks like a S385-26 or S380-26. The only difference between these two balances is the 'depth' of the bottom nylon shoe, so compare both with your old hardware to see what matches best. You will need a stamp option of 2530. 

In regards to your other-sized windows; in general it is always most reliable to go by an old balance from the window, so we can't say for sure what you need otherwise. Similarly, we also cannot say for sure either if these other balances will still be either the Series 380 or Series 385.  That said, if you can provide the following information for each window, we may be able to help narrow down the length and stamp options needed. Can you tell us the height of the visible glass in each window, as well as the exact weight of each window sash? From there, we'll try our best to recommend what you need. 

One last point: if you know the manufacturer of the windows, that may help us confirm the probably Series you need. Many thanks. 

This is perfect, thank you so much for doing the leg work on this. I agree with your assessment of the 28-3 balance, our S385-29 is likely your best bet.

For the 15 pound sash with the 18" glass: assuming that it's the same window model as the others (apart from size), then I recommend our S385-19 with an 1840 stamp. Two of these working together can carry 14 through 17 pounds so it should definitely carry your sash weight.

You are very welcome. Be sure and get back in touch with us and let us know hoe=everything works out.

That is great news! We are happy to hear that everything has worked put. Please contact us again for a future hardware project.