What it is
Metric count Nm: tex = 1000 / Nm. Larger is finer. Not nanometres, not needle NM.
How to use
tex = 1000 ÷ Nm. 40 Nm = 25 tex. Inverse conversion above.
tex = 1000 ÷ Nm
Example: 1 Nm = 1000 tex
Common uses
Worsted, wool, some sewing threads.
Conversion tips
Inversely proportional to tex. Not a needle size.