I spin all sorts of yarns, from thread to super-bulky coil yarn. Here are a few threads I've spun but have not yet used in projects. :)
This is 13.5 micron Sharlea merino that I washed and spun (the yarn was spun from considerably less than one lock - .7 grams).
a thread I spun (and plied) from a quarter ounce of mulberry silk.
It’s 119 yards long.