Window coil spring

Hello,

Your photos resemble the 17/32" thick 15-199 pivot shoe. The 15-199 is used with either the 1/2" wide Series 160 or 3/8" wide Series 165 coil springs. Take a look at these parts, along with the related items shown on our product pages.

Alternate view of 15-199

I also believe there is more to the stamp on your coil spring that is not clear in your photo. If you could write out all of the numbers, that would help us determine the corresponding strength option. Thank you! 

I can tell you that the S165 is used with the 15-205 triple support but keep in mind that the S165 coils measure 3/8" wide, not 3/4". Your stamp numbers also do not correspond to any of our strength options, so I would recommend weighing your window sash and dividing the weight by six, since you have three coil springs on each side, to determine the correct strength options. 

Great, just let us know if you have any other questions once you are able to weigh the sash.