FITS
A fit is defined as the condition of clearance or interference between two parts.
Terminology associated with fits
Allowance - The amount of clearance or interference that exists between two parts
Maximum Allowance - The greatest amount of clearance or interference that can exist between mating parts. ( i.e) Largest female size ( upper limit ) minus the smallest male size ( lower limit )
Minimum Allowance - The least amount of clearance or interference that can exist between mating parts. ( i.e) Smallest female size ( lower limit ) minus the largest male size ( upper limit )
Types of fits
There are three types. They are
- Clearance fit
- Interference fit
- Transition fit
Clearance Fit
- There will always be some amount of space between mating parts
- No force required to put these parts together.
- When calculation is performed the allowance values will be positive.
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| Clearance Fit |
Interference Fit
- There will always be some amount of contact between mating parts.
- Usually force will be required to put these parts together.
- When calculation is performed the allowance values will be negative.
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| Interference Fit |
Transition Fit
- There could exist between mating parts sometimes a condition of clearance or interference.
- Force depends on how the parts were toleranced.
- When calculation is performed the allowance values will be positive & negative.
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| Transition Fit |
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