Window balance spring assy 2730 stamp

Quick Learner from Southern california
I have a non tilt spring assembly that has a part number 2730 stamped on it. Can you work with this number or do you need more information?
Thanks
Steve
User submitted picture of channel balance assembly with 2730 stamp.
8 Replies
Paul
Paul from SWISCO
SWISCO
Expert
Thanks for posting! It looks like you may have our Series 350 channel balance. However, I'm not sure of the length. Based on your stamp, I think it may be 28", which would mean you would want to look at our S350-28. Can you please confirm the length of the metal channel? Please do not incorporate the plastic attachments in your measurements. If it is 28", you would also want to select the 2730 stamp option.
Quick Learner from Florida
We also have some with different stamps - we have determined the spring type but unsure of the weight required. One is stamped 28S38. The other is stamped 2990 - 38. Can you tell us what weights we will need?

thanks,

Dave
Tom
Tom from SWISCO
SWISCO
Expert
Thanks for posting, Dave. Those stamps really should be the same. Can you give me the weight of your window sash and the length of the metal channel for your balances? That will help us determine the appropriate stamp.
Quick Learner from Delltona, Florida
I don't know the weights of the sash, but the one with 28S38 is 29" long,
the one with 2990-38 is 30" long.

thanks,

Dave
Tom
Tom from SWISCO
SWISCO
Expert
Without knowing the weight of the window sash, we cannot recommend the appropriate option. You will have to remove the sash from the window and place it on a scale to determine its weight. We need the weight to be as precise as possible, as well. Thank you!
Quick Learner from Deltona, Florida
I weighed the panels and they are approx 38 - 40 #.

thanks,

Dave
Paul
Paul from SWISCO
SWISCO
Expert

Alright. After reviewing your information, we have decided that these balances will have to be specially made. 

With that said, I'll go ahead and email you a custom order link that you can use to place an order on our website. 

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