Which spring strength do I need?

Question

I'm pretty sure I need the s385 balance, but I'm not quite sure how to read the label to determine the spring strength. Would the 20 5 marking indicate a 2050 spring? Thank you!

Jasmine · Accepted Answer

Hey there,

Thanks for reaching out! If the shoe on the balance has depth measuring 1-3/32", then the S385-21 should be the correct replacement. Be sure to double check this.

The 2050 stamp may be the one you need but you may want to weight the window sash to confirm that it weighs between 23 to 27lbs. The chart below the product description lists the weight range each stamp option can support.

Comparison of the S378, S380 and S385 balance shoes.