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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. General tolerances specified in angular units control only the general orientation of lines or line elements of surfaces, but not their form deviations.ĥ. Smaller or larger tolerances should be indicated adjacent to the relevant nominal dimensions.Ĥ.
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When selecting the tolerance class, the respective customary workshop accuracy has to be taken into consideration.ģ. 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. This part of ISO 2768 is intended to simplify drawing indications and it specifies general tolerances for linear and angular dimensions without individual. ISO 2768 Part 1 only applies to the following dimensions which do not have an individual tolerance indication:Ī) linear dimensions (e.g. The limit measurements of the tolerance classes m and f of DIN ISO 2768-1 are identic with those of DIN 7168-1.
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For new designs only the general tolerance according to DIN ISO 2768-1 should be valid. ISO 2768 m or general tolerance ISO 2768 m. It applies to the dimensions of parts that are produced by metal removal or parts that are formed with sheet metal fabrication. Variations on dimensions without tolerance values are according to 'DIN ISO 2768-mk'. 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.