Spiral balance replacement

A quick learner from Texas, USA says:
September 15, 2022

I need to replace the spiral balances in my window. I have removed the old one and it measures 30 inches long and 3/8 in diameter. It is a metal tube, but does not have a colored tip. It is a single hung window, so how can I determine its weight to order the correct balance?

(The house was built in the early 80's, if that helps any.)

Thanks

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Tom from SWISCO responded:
September 19, 2022

Hello! I see you were looking at our S400-30. Am I right to presume, then, that this is a non-tilt window? I just want to be 100% sure.

Whether your window is tilt or non-tilt, though, then the broad answer is the same: if your have no color tip on your old balance to use as a reference, you must weigh the sash on a scale and refer to the chart you see on that product page. 
30" Series 400 Spiral Balance
30" Series 400 Spiral Balance
S400-30
$10.77
How to Identify a Replacement Spiral Balance
How to Identify a Replacement Spiral Balance
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How to choose the proper spiral balance tip color
How to choose the proper spiral balance tip color
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How to adjust a spiral balance on a non-tilt window
How to adjust a spiral balance on a non-tilt window
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