EN ISO 286-1 and 2 :2010 Geometrical product specifications (GPS)

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EN ISO 286:2010 Geometrical product specifications (GPS) - ISO code system for tolerances on linear sizes

EN ISO 286-1:2010 Geometrical product specifications (GPS) - ISO code system for tolerances on linear sizes - Part 1: Basis of tolerances, deviations and fits (ISO 286-1:2010)

This part of ISO 286 establishes the ISO code system for tolerances to be used for linear sizes of features of
the following types:
a) cylinder;
b) two parallel opposite surfaces.
It defines the basic concepts and the related terminology for this code system. It provides a standardized
selection of tolerance classes for general purposes from amongst the numerous possibilities.
Additionally, it defines the basic terminology for fits between two features of size without constraints of
orientation and location and explains the principles of “basic hole” and “basic shaft”.

EN ISO 286-2:2010 Geometrical product specifications (GPS) - ISO code system for tolerances on linear sizes - Part 2: Tables of standard tolerance classes and limit deviations for holes and shafts (ISO 286-2:2010)

This part of ISO 286 gives values of the limit deviations for commonly used tolerance classes for holes and
shafts calculated from the tables given in ISO 286-1. This part of ISO 286 covers values for the upper limit
deviations ES (for holes) and es (for shafts), and the lower limit deviations EI (for holes) and ei (for shafts)
(see Figures 1 and 2).
NOTE In the tables of limit deviations, the values of the upper limit deviation ES or es are shown above the values of
the lower limit deviation EI or ei except for tolerance classes JS and js which are symmetrical about the zero line.
The ISO system for tolerances on linear size provides a system of tolerances and deviations suitable for
features of the following types:
a) cylinders;
b) two parallel opposite surfaces.
For simplicity, and also because of the importance of cylindrical workpieces of circular section, only these are
referred to explicitly. It should be clearly understood, however, that the tolerances and deviations given in this
part of ISO 286 equally apply to workpieces of other than circular sections.
In particular, the term “hole” or “shaft” is used to designate features of the cylinder type (e.g. for the
tolerancing of the diameter of a hole or shaft) and, for simplicity, these terms are also used for two parallel
opposite surfaces (e.g. for the tolerancing of the thickness of a key or the width of a slot).
For further information on terminology, symbols, the basis of the system, etc., see ISO 286-1.

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