Difference between S170-407 and S170-408?

Question

I need to replace a few parts on a window. I do not have the exact model or series of the window. The pictures are helpful. What is the diference between the S170-407 and S170-408 coil spring?

Paul · Accepted Answer

Great, glad we can help. To answer your question, a single S170-407 coil spring can carry 7 pounds, while a single S170-408 coil spring can carry 8 pounds.