BS EN 22768-1:1993

Cooperating organizations
National foreword
Foreword
Introduction
Specification
1 Scope
2 General
3 Normative references
4 General tolerances
5 Indications on drawings
6 Rejection
Annexes
A (informative) Concepts behind general tolerancing of
    linear and angular dimensions
ZA (normative) Normative references to international
    publications with their relevant European
    publications
Tables
1 Permissible deviations for linear dimensions except
    for broken edges
2 Permissible deviations for broken edges
3 Permissible deviations of angular dimensions
National annexes
NA (informative) Committees responsible
NB (informative) Cross-reference

Simplifies drawing indications and specifies general tolerances for linear and angular dimensions without individual tolerance indications in four tolerance classes. Only applies for the following dimensions that do not have an individual tolerance indication: linear and angular dimensions produced by machining assembled parts; linear dimensions; angular dimensions including angular dimensions usually not indicated.

This part of ISO2768 is intended to simplify drawing indications and it specifies general tolerances for linear and angular dimensions without individual tolerance indications in four tolerance classes. NOTE1— The concepts behind the general tolerancing of linear and angular dimensions are described in annexA. It applies to the dimensions of parts that are produced by metal removal or parts that are formed from sheet metal. NOTES These tolerances may be suitable for use with materials other than metal. Parallel International Standards exist or are planned, e.g. see ISO80621) for castings. This part of ISO2768 only applies for the following dimensions which do not have an individual tolerance indication: linear dimensions (e.g. external sizes, internal sizes, step sizes, diameters, radii, distances, external radii and chamfer heights for broken edges); angular dimensions, including angular dimensions usually not indicated, e.g. right angles (90°), unless reference to ISO2768-2 is made, or angles of uniform polygons; linear and angular dimensions produced by machining assembled parts. It does not apply for the following dimensions: linear and angular dimensions which are covered by reference to other standards on general tolerances; auxiliary dimensions indicated in brackets; theoretically exact dimensions indicated in rectangular frames.