![]() ISO 2768-1 stands for the general tolerances for linear and angular dimensions without individual tolerance indications, ISO 2768-1 indicates the linear dimensions and angular dimensions such as external sizes, internal sizes, step sizes, diameters, radii, distances, external radii, and chamfer heights for broken edges. ![]() The following is a brief summary of ISO 2768-1 and ISO 2768-2 specifications: #1 General Tolerances ISO 2768-1 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. General tolerances for size and geometry makes it easier to ensure that the size and geometry of all features can be done as requested. Nothing shall be implied or left to interpretation in the workshop or inspection department. ![]() To ensure that the size and geometry of all features are made as required, we should carefully take care of the tolerancing on the drawing. Every feature on products or parts has a size and a geometrical shape. ![]()
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March 2023
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