I love collecting various types of sewing thread. I recently learn that sewing threads can classified with a weight number. If you look at the label or the rim of the thread spool you can often find the weight number listed. The higher the weight number the thinner the thread. The lower the weight number the thicker the thread. The most common thread weight numbers are 60wt, 50wt, 40wt, and 12wt.
- Cotton 60 Weight: Used for quilting, piecing, applique, embroidery; common brand Mettler Silk Finish Cotton 60wt.
- Cotton 50 Weight: Used for subtle quilting; common brands are Gutermann Natural Cotton 50wt and Auriful Cotton Mako 50wt.
- Polyester 50 Weight: Used for sewing garments, handbags, furnishings; common brands are those you most often see in the big thread display cases in fabric stores such as Coats & Clark Dual Duty XP.
- Cotton 40 Weight: Used for quilting, applique and embroidery; common brand Superior King Tut 40wt.
- Cotton 12 Weight: Used for hand-sewing and hand-quilting; common brand Sulky Cotton Petites 12wt.