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About This Item
Full Description
NOTE 1 The concepts behind the general tolerancing of linear and angular dimensions are described in annex A.
BS EN 22768-1:1993 applies to the dimensions of parts that are produced by metal removal or parts that are formed from sheet metal.
NOTE 2 These tolerances may be suitable for use with materials other than metal.
NOTE 3 Parallel International Standards exist or are planned, e.g. see ISO 80621) for castings.
BS EN 22768-1:1993 only applies for the following dimensions which do not have an individual tolerance indication:
a) linear dimensions (e.g. external sizes, internal sizes, step sizes, diameters, radii, distances, external radii and chamfer heights for broken edges);
b) angular dimensions, including angular dimensions usually not indicated, e.g. right angles (90), unless reference to ISO 2768-2 is made, or angles of uniform polygons;
c) linear and angular dimensions produced by machining assembled parts.
BS EN 22768-1:1993 does not apply for the following dimensions:
a) linear and angular dimensions which are covered by reference to other standards on general tolerances;
b) auxiliary dimensions indicated in brackets;
c) theoretically exact dimensions indicated in rectangular frames.
Cross References:
BS EN 22768-2
ISO 8015