The new national standard has made a principle provision on how to judge whether the hole and shaft are qualified according to the limit size, which is called Limit size judgment principle, that is Taylor principle.

    The Taylor principle states that the operating size of a hole or shaft must not exceed the maximum physical size.For holes, the acting size shall not be less than the minimum limit size; For shafts, the size of the action should not be greater than the maximum limit size. At the same time, the actual size at any position shall not exceed the minimum physical size, the local actual size of the hole shall not be greater than the maximum limit size, and the local actual size of the shaft shall not be less than the minimum limit size.

    Taylor principle is the basis of inspection and quantity regulation. Practical problems existing in production can be clarified in principle, such as how to select points when measuring, the relationship between shape tolerance and dimensional tolerance, how to judge the workpiece qualified, and to ensure that the requirements meet.
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