Coil Spring

Quick Learner from Oxford PA

Nov 21, 2025 1:57 pm

I'm replacing a Simonton window coil balance for a 16lb sash. My old coil spring has no indication of its weight. Which of your S159 coil springs should I get?

4 Replies

Bob from SWISCO

Nov 24, 2025 12:35 am

Thanks for posting. For a sash that weighs exactly 16 pounds, use (2) of the S159-07 7.5 pound springs, one on each side of the sash. This will give you 15 pounds of overall support. Being within 1 pound of the exact sash weight works just fine. Let me know if you have further questions.

Quick Learner from Oxford PA

Nov 24, 2025 11:54 am

Great thanks!

Bob from SWISCO

Nov 25, 2025 4:24 pm

My pleasure. Let us know if you have further questions!