spiral balance cycles before failure

A professional from Kentucky says:
October 21, 2010
What is the number of cycles a balance is intended to handle before failure.
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Paul from SWISCO responded:
October 25, 2010
The life expectancy of the S400 spiral balance is 5 to 10 years under normal use. Several factors determine the life expectancy such as having the correct strength balance for the sash weight, usage, and window sash friction.
12" Series 400 Spiral Balance
12" Series 400 Spiral Balance
S400-12
$9.32
13" Series 400 Spiral Balance
13" Series 400 Spiral Balance
S400-13
$9.32
14" Series 400 Spiral Balance
14" Series 400 Spiral Balance
S400-14
$9.32
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