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ISO system of limits and fits - Part 2: Tables of standard tolerance grades and limit deviations for holes and shafts

Executive summary

Limit deviations for commonly used tolerance classes for holes and shafts.

Abstract

This part of EN 20286 gives values for the limit deviations for commonly used tolerance classes (zones) for holes and shafts calculated from the information given in ISO 286-1. This European Standard covers values for the upper deviations ES (for holes) and es (for shafts), and the lower deviations EI (for holes) and ei (for shafts).

The major changes incorporated in this European Standard are as follows.

a) The presentation of the information has been modified so that this standard can be used directly in both the design office and the workshop. This has been achieved by separating the material dealing with the bases of the system, and the calculated values of standard tolerances and fundamental deviations, from the tables giving specific limits of the most commonly used tolerances and deviations.

b) The new symbols js and JS replace the former symbols to facilitate the use of symbols on equipment with limited character sets.

c) Limit deviations have been included for basic sizes from 500 mm to 3 150 mm as standard requirements.

d) Limit deviations have been extended for holes H and JS, and for shafts h and js by including tolerance grades IT17 and IT18 in all basic sizes.

e) Limit deviations have been extended for some tolerance classes used in fine mechanisms and horology, in basic sizes up to 50 mm.

f) Inch values have been deleted.

g) The principles, terminology and symbols have been aligned with those required by contemporary technology.

History and related standards

This European Standard together with BS 4500-1.1, is a revision of BS 4500-1:1969 which is withdrawn.

This standard includes the following cross references:

ISO 286-1, ISO 1829.

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