App for machinists who need screw thread tolerances. Any ISO or UN thread can processed. Even such exotics as M12.3x1.34. Internal and external threads supported. Also calculation of tap holes provided. You do not need tolerance tables and wasting time for searching anymore. All you need is in your phone
Note: Due to rounding rules there may be some miscalculations (one or two microns). If precision is critical you should use appropriate standard.