390 series weight

Handy Person from California

Jun 16, 2010 4:34 am

I have a balance that looks like the 390 series. Both ends look the same and mine has stampted 2790 which is a 28 inch but it does not show on the available size. What is unique about the 2790?

13 Replies

Paul from SWISCO

Jun 16, 2010 5:46 am

See if there are two more numbers following, those will give you the exact weight of the spring. If you're not sure, send us pictures and we'll see how we can help.

Casey from SWISCO

Jun 16, 2010 6:43 am

Or, remove the window sash and place it on a scale to get the weight in pounds. I can determine the proper strength balance from the sash weight.

Casey from SWISCO

Jun 16, 2010 9:39 am

We will order 2760 stamp option in for you, this will hold a sash weight of 30 through 33 pounds.
This information is based on 2 balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate.
I will post again as soon as they are ready for purchase, approx 3 week lead time

Handy Person

Jun 16, 2010 10:46 am

2790 gk 30 is what is stamped

Quick Learner

Jun 16, 2010 10:29 pm

ok i need the two balances and 4 Product Code: 18-008 top sash guides.

Casey from SWISCO

Jun 17, 2010 8:25 am

I will post again as soon as the 2760 stamp option are ready for purchase

Quick Learner

Jun 17, 2010 10:52 am

So do i order these or do you order them and then let me know when there in?

Quick Learner

Jun 17, 2010 12:27 pm

I will weigh the window just for good measure.

Home Owner

Jun 24, 2010 11:23 pm

They weight 30.4 pounds.

Dave Sr. from SWISCO

Jul 1, 2010 7:52 am

The 2760 balance will hold the weight of your sash.

Casey from SWISCO

Jul 7, 2010 11:34 am

The 2760 stamp option for the Series 390 is now available online:

S390-28"

Quick Learner

Jul 8, 2010 10:37 am

Thank You i just placed the order.