Coil balance spring

A home owner says:
March 8, 2024
Could you please help me to find correct stamp on swisco 170 in picture? I believe it is swisco 170 coil balancer. The weigh of window sash with glass is 18.8lbs. Thank you in advance.
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Jasmine from SWISCO responded:
March 11, 2024

Hey there,

Thanks for posting! Based on the weight of your sash, the coil spring you need would be the S170-409, which is a 9lb coils. Two coils, one for each side of the window, will support the weight of your 18lb sash.

I hope this helps!
409 Series 170 Coiled Balance Spring
409 Series 170 Coiled Balance Spring
S170-409
$6.57
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