Concept:
Nominal sizeis the size of a part specified in the drawing as a matter of convenience.
Actual sizeis the actualmeasured dimension of the part.
See Also
Find the Maxima and Minima of an EquationFlexi answers - How can I find the minimum and maximum values?Maxima and Minima of Functions - Derivative Tests, and FAQsHow to read a histogram, min, max, median & meanToleranceis the difference between theupper limitand thelower limitof a dimension.
In other words, it is the maximum permissible variation in a dimension.
The tolerance may be unilateral or bilateral.
When all thetolerance is allowed on one side of the nominal size, e.g.\(10_{ - 0.004}^{ + 0.000}\;\), then it is said to be aunilateral systemof tolerance.
When tolerance is allowed onboth sidesof the nominal size e.g.\(10_{ - 0.004}^{ + 0.004},\)then it is said to be bilateral system of tolerance.
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