In the BIS system of limits and fits, the grades of tolerance are represented by numbers, and they are 18 grades of tolerances.

In the BIS system of limits and fits, the grades of tolerance are represented by numbers, and they are 18 grades of tolerances.

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A hole whose lower deviation is zero is called basic hole. H letters indicates basic hole.

Under the terminology of the IS system of limits the term 'tolerance' is defined as the difference between the Maximum limit and minimum limit.

If the dimension of a component is finished within the limits of size, then it will be Acceptable size.