Question about window balance coil spring equivalency

A handy person from Woodbridge, Virginia says:
March 30, 2015
I just placed order 618045 for product S190-840, a 1/2" 840 window balance coil spring. I measured my broken spring at about 1/2" wide and the screw end style matches up also. However, my coil spring is stamped with an 8, and after my adventures in Googling, my conjecture is that the spring is rated for 8 lbs. of force and this is equivalent to springs with an 840 stamping. Please do inform me if I have made a mistake and need to modify or cancel my order.

Thank you.
User submitted photos of a coil balance.
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Paul from SWISCO responded:
April 1, 2015
Yes, each of our S190-840 coil springs can carry 8 pounds each. If you would like me to confirm that this is what you need, please give us the weight of your sash and the size of the visible glass.
A handy person from Woodbridge, Virginia says:
April 1, 2015
Thanks Paul! I think I am set for a simple replacement--I could make out the 8 stamped on both springs in the balance. Hopefully, the new spring is in the mail.

Jonathan
840 S190 Coil Balance Spring
840 S190 Coil Balance Spring
S190-840
$11.32
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