Linear and Geometric Tolerancing of Dimensions
7.1 Linear tolerancing
7.1.1 Limits and fits
It is not possible to work to an exact size nor is it possible to measure to an exact size. Therefore dimensions are given limits of size. Providing the dimensions of a part lie within the limits of size set by the designer, then the part will function correctly. Similarly the dimensions of gauges and measuring equipment are given limits of size. As a general rule, the limits of size allocated to gauges and measuring instruments are approximately 10 times more accurate than the dimensions they are intended to check (gauges) or measure (measuring instruments).
The upper and lower sizes of a dimension are called the limits and the difference in size between ...
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