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Quick Learner from Columbia Maryland

May 18, 2016 5:51 pm

2 sizes. 1) 18 7/8 with stamp 1840Z. 2) 28 1/2 stamped 1830Z

User submitted photos of a window balance.

7 Replies

Paul from SWISCO

May 20, 2016 1:38 pm

Thanks for posting. Can you confirm the metal channel length for both balances? These usually end on the inch. In both cases I believe you have the Series 371 channel balance. If your balance lengths are accurate, they will need to be custom made. Let me know!

Quick Learner from Columbia MD

May 20, 2016 2:37 pm

Thanks for getting back to me. The smaller one is 19 with a stamp 1840 Z. I remeasured the larger one. It is closer to 28 5/8 with stamp 2830 Z. I found a sticker in one of the windows that are over 30 years old. I couldn't read all of it but it looked AA-- Sponsored series2500 . mst a676? I was guessing it would be 29 inch because of the 2830 stamp. Would 3/8 of an inch cause a problem? Thanks

Quick Learner from Columbia Maryland

May 20, 2016 4:13 pm

Thanks for getting back to me. I agree the smaller one is 18 7/8 with a stamp 1840 Z. The larger one is 28 5/8 inches long with a 2'830 Z stamp. So Should l order the 371-19 , 1840. And the 371-29, 2830? Would 3/8 of an inch make a big difference?

Paul from SWISCO

May 23, 2016 11:39 am

I believe you have a Rollyson window. Why some of their balance are cut down, I don't know. You would think they would make them standard like other window companies. That said, you can try a full inch for the S371-29 (2830 option). I also think the S371-19 (1840) should be fine.

Quick Learner from Columbia MD

May 23, 2016 12:02 pm

Sounds like a plan,thank you. Should I try just one or order all 16. Can I return if they don't work?

Tom from SWISCO

May 23, 2016 1:47 pm

It's up to you! You can return the hardware if it doesn't work. See our return policy for more information.