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.
threads, and the base or root diameter on internal threads â¢ the minimum or minor diameter, which is the screw diameter at the base of an external thread, and the thread crest diameter of an internal thread â¢ the thread pitch, which is the distance between two adjacent thread crests â¢ the thread pitch diameter, which is an imaginary diameter measured through the threads where the width of the groove and thread are equal