Correct Coil balance weight

A handy person from Great Falls, VA says:
February 15, 2017
I ordered 4 - S180-5 for my Traco windows but I'm not sure they are the correct weight after comparing the new one with the old coil. I included a picture of the old coil with a stamp on it with a large number 5 and in smaller type, 37w. There is also a picture of the coil housings. The last picture is comparing the new coil I ordered from you on left with the old coil on right.
My question is, did I order the correct weight coils?
Thanks for your help,
S. Lee
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
February 21, 2017
I agree, the S180-5 looks to be the best match based on your old stamp. A good way to confirm this is to get the weight of your sash and divide it among the number of springs used to support it. For example, if your sash weighs 20 pounds, and you use four springs altogether, you would want springs that can carry 5 pounds each.
5 lbs Series 180 Coil Balance
5 lbs Series 180 Coil Balance
S180-05
$4.37
Tandem Coil Housing
Tandem Coil Housing
15-086
$1.68
Coil Housing Pivot
Coil Housing Pivot
15-087
$5.97
Mounting Bracket
Mounting Bracket
16-024
$0.66
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