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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. If general tolerances in accordance with ISO 2768 shall apply, the information shall be indicated in or near the title block, such as ISO 2768-m. What is ISO 2768-mK Meaning An ISO 2768-mK mark means the dimension information for which the tolerances are not specified will be followed according to the m and K class. By choosing the tolerance class. The figures are consequently simplified to indicate only the relevant principles.
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NOTE 1 The figures, as shown in this document, merely illustrate the text and are not intended to reflect actual usage. ISO 2768-1 and ISO 8062-3) is explained in Annex A. ISO 2768-H (and to ISO 2768-mH when general tolerances for dimensions are. individual tolerances and general tolerances according to, e.g. General tolerances specified in angular units control only the general orientation of lines or line elements of surfaces, but not their form deviations.ĥ. General tolerances for linear measures and level squares with four tolerance classes are useful for simplifying drawings. The substitute orientation vector E has a magnitude of 1 and is defined by its. Smaller or larger tolerances should be indicated adjacent to the relevant nominal dimensions.Ĥ. When selecting the tolerance class, the respective customary workshop accuracy has to be taken into consideration.ģ. ISO 2768 and derivative geometrical tolerance standards are intendedto simplify drawing specifications for mechanical tolerances. Can someone please tell me what the mK means Right now I am assuming the 'm' stands for medium, and I have no idea on the 'K'. These tolerances may be suitable for use with materials other than metal.Ģ. It does not apply for the following dimensions:Ī) linear and angular dimensions which are covered by reference to other standards on general tolerances ī) auxiliary dimensions indicated in brackets Ĭ) theoretically exact dimensions indicated in rectangular frames.ġ. unless reference to ISO 2768-2 is made, or angles of uniform polygons Ĭ) linear and angular dimensions produced by machining assembled parts. external sizes, internal sizes, step sizes, diameters, radii, distances, external radii and chamfer heights for broken edges) ī) angular dimensions, including angular dimensions usually not indicated, e.g. ISO 2768 Part 1 only applies to the following dimensions which do not have an individual tolerance indication:Ī) linear dimensions (e.g. It applies to the dimensions of parts that are produced by metal removal or parts that are formed with sheet metal fabrication.
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ISO 2768 Part 1 is intended to simplify drawing indications and it specifies general tolerances for linear and angular dimensions without individual tolerance indications in four tolerance classes.