Wednesday, 5 September 2018


          The components of the tolerenced dimension shall be indicated in the following order: 
a) The basic size, and
b) The tolerence symbol.
          If, in addition to the symbols it is necessary to express the values of the deviations or the limits of size, the additional information shall be shown in brackets.

Permissible deviation:
.The upper deviation or the upper limit of size shall be written in the upper position and the lower deviation or the lower limit of size in the lower position, irrespective of whether a hole or shaft is tolerenced.
.The tolerence symbol for the hole shall be placed before that for the shaft or above it, the symbols being preceded by the basic size indicated once only. 

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