Broken spring

Quick Learner from Durham, NC
Hi, I am not sure what spring this is. I do not see any part numbers on spring or holder parts.
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4 Replies
Casey
Casey from SWISCO
SWISCO
Expert

Hello,

Your pivot shoe looks like a match to the 15-180 balance shoe, which is used with the Series 190 coil springs. There would normally be numbers stamped on the original coils that correspond to one of our strength options. If not, you'd need to divide the weight of your sash by the number of coils used on both sides. Thank you! 

Quick Learner from Durham, NC
Thank you. The weight of my sash is 16.8lb and have 1 spring per side so need each spring to hold 8.4 lb. Would you still recommend this 740 spring or would it better with 840 or 940?
Casey
Casey from SWISCO
SWISCO
Expert

In that case, I'd recommend using one S190-840 coil spring on each side. 

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