This part of ISO 2768 is intended to simplify drawing indica-tions and it specifies general tolerances for linear and angular dimensions without individual tolerance indications in four tol-erance classes.
NOTE 1 — The concepts behind the general tolerancing of linear and angular dimensions are described in annex A.
It applies to the dimensions of parts that are produced by metal removal or parts that are formed from sheet metal.
NOTES
2 These tolerances may be suitable for use with materials other than metal.
3 Parallel International Standards exist or are planned, e.g. see ISO 80621? for castings.
This part of ISO 2768 only applies for the following dimensions which do not have an individual tolerance indication:
a) linear dimensions (e.g. externa I sizes, internal sizes, step sizes, diameters, radii, distances, externat radii and chamfer heights for braken edges);
b) angular dimensions, including angular dimensions usually not indicated, e.g. right angles (90°), unless ref-erence to ISO 2768-2 is made, or angles of uniform poly-gons;
c) linear and angular dimensions produced by machining assembled parts.
It 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 f r?mes.
SIS SS-ISO 2768-1:1990 history
1990SIS SS-ISO 2768-1:1990 General tolerances — Part 1: Tolerances for linear and angular dimensions without individual tolerance indications