m class is specified in ISO 2768-1 and K class is specified in ISO 2768-2, which including H, K, and L tolerance levels. ISO 2768-mK means the dimension information for which the tolerances are not specified will be followed according to the m and K class. Since individual tolerances aren’t provided, the designer must ensure that products made to the drawings will function properly. The ISO 2768 series of standards were developed by the International Organization for Standardization to provide general tolerances for linear and angular dimensions without individual tolerance indications on technical drawings. Table 7 – General Tolerances on Circular Run-Out.Table 6 – General Tolerances on Symmetry.Table 5 – General Tolerances on Perpendicularity. Table 4 – General Tolerances on Straightness and Flatness.Table 2 – External Radii and Chamfer Heights.
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