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A shaft of diameter \({30^{\begin{array}{*{20}{c}} { + 0.05}\\ { - 0.15} \end{array}}}\;mm\) and a hole a diameter \({30^{\begin{array}{*{20}{c}} { + 0.20}\\ { + 0.10} \end{array}}}\;mm\), when assembled would yield,

A shaft of diameter \({30^{\begin{array}{*{20}{c}} { + 0.05}\\ { - 0.15} \end{array}}}\;mm\) and a hole a diameter \({30^{\begin{array}{*{20}{c}} { + 0.20}\\ { + 0.10} \end{array}}}\;mm\), when assembled would yield, Correct Answer Clearance fit

Concept:

Fit is a relationship that exists between two mating parts, a hole, and a shaft, with respect to their dimensional difference before assembly.

There are three types of fits.

  1. Clearance fit. 
  2. Interference fit
  3. Transition fit.

Clearance fit: In this fit, the size of the Hole is always greater than the size of the shaft. Clearance is the difference between the size of the hole and the size of the shaft which is always positive. Here the tolerance zone of the hole will be above the tolerance zone of the shaft.

  • Examples: Slide fit, easy sliding fit, running fit, slack running fit, and loose running fit.

Additional Information

Interference fit: In this fit, the size of the Hole is always less than the size of the shaft. Interference is the difference between the size of the hole and the size of the shaft which is always negative i.e. shaft is always larger than the hole size. Here, the tolerance zone of the hole will be below the tolerance zone of the shaft.

  • Examples: Shrink fit, heavy drive fit, and light drive fit.

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Transition fit: It may sometimes provide clearance and sometimes interference. Here the tolerance zones of the hole and shaft will overlap each other.

  • Examples: Tight fit and push-fit, wringing fit, press fit.

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