ISO Tolerance is an application that brings ISO Hole Basis Tolerance charts to your iPhone. Based on ISO 286,the application allows users to enter a nominal diameter for hole or shaft, select the tolerance grade using a simple selector, and reveal the upper and lower tolerances based on the selected grade. The application calculates tolerances for nominal diameters between 0 and 500 mm in metric mode. The application calculates tolerances for nominal diameters between 0 and 19.685 inches in imperial mode. Tolerance grades range from "A" to "ZC" for holes, and "a" to "zc" for shafts. Additional functionality of ISO 2768 tolerances. Users can now find tolerances for Linear dimensions, Chamfers and Radii, Angles, Straightness, Flatness, Perpendicularity, Symmetry, and run out as defined in ISO 2768 table 1 and table 2. The app contains a limits and fits calculator for easily seeing which combination of tolerances offer clearance, transition or interference fits. Ideal for CNC Machinists, Manual Machinists, Inspectors, Designers, Draughtsmen and Students wishing to dispense with tolerance charts and books, bringing the convenience of all the information direct to the iPhone.