Sash coil replacement

A home owner from USA says:

August 24, 2017

Hi There,

I have a double hung with a broken sash coil that needs to be replaced. Below are two pics that I took for the broken coil and what left from it.
The window made is a Thermo-Tite and dimension of the window is as follow:
Width 35" x height 2 f per side which makes the total height 4 f
I am looking for the right part and would like to know how to replace it as well as the price and shipping.
If you have any questions you can email me back on the same email address.

Regards

User submitted photos of a window balance.

Paul from SWISCO responded:

August 25, 2017

Hi! The pivot shoe you're showing us is the 15-177, which uses Series 152 coil springs. You'll need the spring weight number, which is stamped on the coil spring near the screw-hole, to place an order.

A home owner from New York says:

August 27, 2017

Hi Paul,
I measured the coil width and it's 1/2". After searching everywhere the only number on the coil is a letter "F" no numbers there. The sash is 15 lbs Please advise?

Thanks,

Tom from SWISCO responded:

August 31, 2017

Thanks for getting back to us. Generally, when it comes to coil springs you want to divide the weight of the sash among the coil springs used to support it. In your case, it looks like you have one spring on each side for a 15 pound sash. We don't have anything that adds up to that evenly, but our S152-7 carries 7 pounds per spring and our S152-8 supports 8 pounds per spring. It would be up to you which you think is best. You may want to get the exact weight of the sash to confirm.

Coil Balance Shoe, Slate Blue

15-177

$3.47

1/2" Coil Single Support

15-150S

$1.10

6 lb Series 152 Coil Balance

S152-6

$4.80

7 lb Series 152 Coil Balance

S152-7

$4.80

8 lb Series 152 Coil Balance

S152-8

$4.90

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