Coil Balance ID

A contractor from Belvidere, NJ says:

We are trying to identify the proper springs for replacement in Certainteed tilt windows circa 2000. The sash weight is approximately 20 lbs and the original springs have the number 10 stamped on them. Please get back to us with any information you have.

Thank you,

Jim

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Manuela from SWISCO responded:

This information is a great start! Now, we just need to see photos of the coil spring you need to have replaced. Please make sure the spring is out of the window when taking the photos. Thank you. 

A contractor from Belvidere, NJ says:
Here are the pictures of the aforementioned springs
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Manuela from SWISCO responded:

Thanks for getting back to us, Jim. These coil balances look like the Series 170 and Series 171 coil springs that are used with our 15-192 CertainTeed Pivot Shoe. 

Now, we don't carry a coil spring for this coil balance system that supports 10 lbs individually. First, I would confirm that your window sash does, in fact, weigh exactly 20 lbs. If it does, what I suggest you do is use two coil springs on each side of the window sash: (1) S170-405, and (1) S171-405. The Series 171 is meant to be used as the second coil in a system; it has a longer tongue that reaches around the Series 170 to attach to the pivot shoe. See the video below for more details. 

Both of these coil balances support 5 lbs of weight apiece. This would equal 10 lbs of support on each side of your sash, for a total 20 lbs of support. Let me know if you have any further questions.

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