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.
/O. Match the measurements to the charts.EATON Hydraulics Threads How to Measure Threads Use a thread pitch gauge to determine the number of threads per inch or the distance between threads in metric connections. 6 I.D.D. O. How to Identify Fluid Ports and Connectors E-SROV-TS009-E November 2003 .