Correct option is D
The
fit defines the
relationship between two mating parts (such as a hole and a shaft) when they are assembled. It determines
whether the parts will have clearance, interference, or a tight fit. The fit is classified based on the
actual dimensions and tolerances of the mating components.
Types of Fits:
1.
Clearance Fit – The shaft is
always smaller than the hole, allowing free movement (e.g., bearings).
2.
Interference Fit – The shaft is
larger than or equal to the hole, requiring force for assembly (e.g., press-fit gears).
3.
Transition Fit – The shaft
may be slightly smaller, equal to, or slightly larger than the hole, leading to either a loose or tight fit.
