I need dimensions for your Series 152 - 7 lb coil balance springs please. I need to buy a coil spring of 1/2 inch wide, max diameter of 1-1/4 inches, and with a length of around 30 inches.
My window sash weighs 14 lbs (on bathroom scale) so I want to buy 2 x 7 lb springs (one on each side). My original window springs broke after 20+ years (as shown in the photos) because I think they originally had the wrong weight springs installed. The window erroneously had 2 x 12 lb balance springs installed (i.e. 24 lbs springs for a 14 lb sash), which I think explains why it was always stubborn and difficult to move. The old coil springs were a double spring set, and always stuck and ended up bending and breaking as we fought to open and close the window. So I want to try 2 x 7 lb coil springs and need to know if yours are the right dimensions please & thank-you!
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Bob from SWISCO responded:
July 7, 2023
Thanks for posting. The Series 152 Coil Balances are a 1/2" wide and have a travel length of about 40"; however, this tends to not be the most reliable way to determine what springs will work for your window. Do you have the original pivot shoes in the window that the springs attach to? The identity of the pivot shoe dictates the correct coil balances. If you can show us that shoe, that will determine everything else. |
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Bob from SWISCO responded:
July 11, 2023
This photo is a huge help, thank you! I recognize this pivot shoe; it's an older design that is no longer made. However, I can say with confidence that it was explicitly designed to work with the Series 152 coil spring. With that shoe in mind, and given your dimensions, I strongly believe that the Series 152 is the product you want. |
