Tilt window

A landlord from Maryland says:
December 17, 2021
Window device has a spring with "7K" imprinted on it.
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Lauren from SWISCO responded:
December 20, 2021

Hello, thank you for posting! 

Your pivot shoe resembles the 15-177 that is compatible with the Series 152 coil springs. Please compare the dimensions below. The 7K should indicate that each individual coil can hold 7 pounds. To confirm, if you have 2 coils on either side of the window, your window sash should weigh 28 pounds. Please let me know if you have any questions. 

Swisco.com
Coil Balance Shoe, Slate Blue
Coil Balance Shoe, Slate Blue
15-177
$3.47
7 lb Series 152 Coil Balance
7 lb Series 152 Coil Balance
S152-7
$4.80
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