Clearance, interference and transition fits – explained | The Mechanical post
“Fit is a term used in enginering to describe the condition of tightness or looseness between a hole and a shaft when assembled together.”
Note: Any external feature of a manufactured part is called a shaft. Any internal feature of a manufactured part is called a hole.
In order to learn about fits, first and foremost let u know about allowance.
So what exactly is allowance?
The difference between hole size and shaft size is called allowance. Allowance is used to explain the difference between clearance fit and interference fit. Positive allowance indicates the clearance fit whereas negative allowance in a fit specifies the interference or force fit. The relationship existing between two parts, shaft, and hole, which are to be assembled, concerning the difference in their sizes before assembly, is called a fit.
When a hole and shaft are assembled together, they may fit loosely or tightly or perfectly. Thus there are three types of fits namely :
3. Transition fit– When a fit provides either clearance or interference it is known as transition fit. In this fit clearance or interference depends upon the actual size of the shaft and hole. And the fit can be identified only during its assembly. Spigot in mating holes, coupling rings and recesses are the examples of transition fit.
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