From the web sites, it appears TEX is the shortened name for textured. It refers to strength. The faster a machine operates and the needed tension on the thread to get a reliable stitch affect how much TEX is needed in a thread to work on a given machine. The way my Gammill is set it needs 28 TEX minimum. When I shop for cone thread, I'm looking for that number. I've noticed that more companies are listing TEX on the label....sure helps.
Interesting on TEX being an abbreviation of TEXTURE. I was always told it was a thread measurement used more for industrial machines (which is what petthefabric says) but it wasn't an abbreviation of anything. Learn something new every day!
