ISO 2768-1

The international standard ISO 2768-1 was formed by the technical committee ISO/TC 3, Limits and fits. Together with the first edition of ISO 2768-1 and ISO 2768-2: 1989, cancels and replace ISO 2768: 1973.

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What is ISO 2768-1?

The international standard ISO 2768-1 was formed by the technical committee ISO/TC 3, Limits and fits. Together with the first edition of ISO 2768-1 and ISO 2768-2: 1989, cancels and replace ISO 2768: 1973.
ISO 2768 has some parts under the title general tolerances which are given below:

  • Part 1: Tolerances for linear and angular dimensions without individual tolerance indications.
  • Part 2: Tolerances for the features of Geometrical components without individual tolerance indications,
  • Annex A of this part of ISO 2768 is for information only.

    All the features of the component part always have a size and a geometrical shape. When this function exceeded impair then limitation is required for the deviation of size and for the deviation of the geometrical characterstics. Complete tolerancing on the drawing should be done just to ensure that the element of size and geometry of all features are to be controlled which means nothing must be implied/ left to judgement in the workshop in the inspection department.

    The general tolerance for the size and geometry simplifies the task of ensuring that this prerequisite is not.

Scope of ISO 2768-1

  • ISO 2768 applies to the dimensions of the parts that are produced by metal removal or parts that are formed from sheet metal.
  • These tolerances may be suitable for use with materials other than metal.
  • Parallel International standards exist or are planned eg ISO 8062 for castings.
  • The part of ISO 2768 only applies to those who do not have an individual tolerance indication:
    1. Linear dimensions such as external and internal sizes, step sizes, diameters, radii, distances, external radii and chamfer heights for broken edges.
    2. Including angular dimensions usually not indicated, e.g. right angles(90 degree) unless reference to ISO 2768 is made or abgles of uniform polygons;
    3. Produced by the machineing assembled parts such as Linear and angular dimensions.