Understanding ISO 2768: The Global Language of General Tolerances 

• 100 mm flatness → tolerance = 0.2 mm

This part covers length, width, diameters, radii, and angles. It defines four tolerance classes based on the desired precision level:  f (fine): For high-precision components. m (medium): The most common standard for general machining.

This comprehensive article answers all those questions and serves as your complete reference guide.