Tolerance class is defined as per design requirements and manufacturing capability. General tolerance ISO 2768 does not specify where to use these tolerances. ![]() ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. Variations on dimensions without tolerance values are according to ISO 2768, all tolerance limits are given in mm. ![]() ISO 2768 is mainly for parts that are manufactured by way of machining or removal of materials. ISO 2768 and derivative geometrical tolerance standards ISO 2768–mk and ISO 2768–fh are intended to simplify drawing specifications for mechanical tolerances.
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