Spiral window ballance.

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Quick Learner from Festus, MO

Feb 3, 2026 12:09 pm

3/8 in diameter. 30 in long tube. No colored tip. Original widows in a 1999 built home. Unknown window manufacturer.

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Casey from SWISCO

Feb 4, 2026 1:41 pm

Hello,

Your spiral balances resemble the S900-30 for tilt windows. If the colored tip is missing, you'll need to weigh your sash to determine which option you'll need. There is a chart on the product page that explains how to choose your option based on the sash weight. Thanks for posting!

How to measure the tube length of the S900 spiral balance.