Identify proper spring replacement

Contractor from 98199
May 16, 2024 5:30 pm
Single hung vinyl window. Part stamp is 3030 BSL It appears to be a 1/2 inch channel.

What would the spring # be? It appears to one of your first listed channel spring shown on your page.
wingless bottom shoe wingless top fitting wingless top fitting 3030 stamped channel
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Emily
Emily from SWISCO
May 20, 2024 9:18 am
SWISCO
EXPERT

Hey there!

This looks like it may be either the S351-31 or S390-31. The difference between the two parts is the depth of the bottom shoe as shown below. I also recommend the 3030 stamp for your replacements.

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.

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Products and resources found in this discussion
31" Series 351 Channel Balance
31" Series 351 Channel Balance
S351-31
$11.52
31" Series 390 Channel Balance
31" Series 390 Channel Balance
S390-31
$11.30
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