In the world of mechanical engineering and manufacturing, drawings are the language of communication. However, if every single dimension on a drawing had to be accompanied by a specific tolerance (e.g., $25.00 \pm 0.05$), technical drawings would become cluttered, difficult to read, and expensive to produce.
However, the overall length of the plate (200mm) is non-critical. You leave it blank. Because of ISO 2768-mK, the machinist knows the 200mm length can vary by ±0.5mm. If the length comes back at 199.6mm, you cannot scrap the part. It is technically compliant. Tolerance Iso 2768 Mk Pdf
Cleaner Drawings: Eliminates "dimension clutter" by removing repetitive ±plus or minus Understanding ISO 2768-mK: A Comprehensive Guide to General
Significance of ISO 2768 MK
External Radii and Chamfer Heights: For the "m" class, the tolerance is ±0.2plus or minus 0.2 mm for sizes 0.5–3 mm and ±0.5plus or minus 0.5 mm for sizes 3–6 mm. Angular Tolerances : The standard defines the permissible
The "mk" combination is widely considered the industry standard for general machining. It provides a balance that is precise enough for most mechanical assemblies while remaining achievable for standard CNC machines and manual tools without driving up production costs.