Then you should be familiar with thread cutting. You need to write down what you can't see on the picture at the bottom. Give you an example; The drawings are marked with the upper die as follows: (When there is no straight line, the corner points are connected by midpoint) (the unmarked corner point of the blade is X). XX) Lower die tolerance (straight line is below x and x degrees). . X+/-0 .5X .X+/-0 . 1X .XX+/-0 .005X .XXX+/-0 .002