Replacement coil spring

A handy person says:
August 25, 2023
Need coil springs for both sides of window. Do not know the size of slings there is no size stamped on Case or sping.
Sash weight i s 11 lbs and is duel spring.
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Emily from SWISCO responded:
August 25, 2023

Hi there!

It looks like you have the 15-087 pivot shoe and 15-086 housing. The Series 180 are the compatible coil springs. With an 11-pound sash, you have two options. You can either use one S180-5 5-pound spring on each side of the window or one S180-6 6-pound spring on each side of the window. The decision is ultimately up to you!
Coil Housing Pivot
Coil Housing Pivot
15-087
$5.97
Tandem Coil Housing
Tandem Coil Housing
15-086
$1.68
5 lbs Series 180 Coil Balance
5 lbs Series 180 Coil Balance
S180-05
$4.37
6 lbs Series 180 Coil Balance
6 lbs Series 180 Coil Balance
S180-06
$4.45
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