Personally, I think AICC should be punted over the goal post of so long compliance standards. and some vendors like to offer multiple choices, and yes AICC does different things, but so does driving a moped and I rarely seen people cruising down the interstate on one (unless you live in LA).
Part One: How to Measure Thread Size. 1  In general, the thread should match the fabric in size and weight. For heavier, thicker fabrics, use heavier thread. 2  Heavier threads create more visible stitches. 3  V-69 is the heaviest size recommended for sewing machines. 4  Heavier threads are stronger.
USING THE MENUM2 = diameter 3mm = thread length (3.00 to 4.60) = average overall screw length in that category including the head. You will note the overlapping sizes, this is due to the variance in head thicknesses. If you are new to our website please see Sizing Notes Can't find what you are looking for?