Spiral Balance

Quick Learner from chicago

Jul 17, 2025 4:50 pm

Spiral Balances seem to be placed in the pictured sheath. It is not clear how to remove it to confirm length. It seems to run the full length of the window pane height - roughly 40+ inches. I want to confirm the type of balance, then place an order. I will be

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4 Replies

Emily from SWISCO

Jul 22, 2025 10:11 am

Hi there!

Thank you for reaching out to us. This looks like a spiral balance for tilt windows, such as the 3/8" S900 or 5/8" S600. You'll have to measure the diameter of the tube to determine the best match. Note that the length is determined by measuring only the outer tube. The video below goes over the replacement process.

Please let us know if you have any questions.

Quick Learner from chicago

Jul 22, 2025 11:36 am

Hi Emily. The tilt windows are very heavy, so I am betting it is the larger diameter. The length is 39 inches, and diameter is measuring 0.55 Inches (9/16). Do you have that diameter?

Emily from SWISCO

Jul 22, 2025 3:35 pm

See the S600-39. The outer tube is 9/16" in diameter, but it is considered 5/8" in the trade. You can also select the red tip option. A pair of S600-39 balances with a red tip will support a sash weighing 12 to 30 pounds.