Difference between tolerance and allowance.

Question

Accepted Answer

Tolerance is the acceptable range of variation in a dimension, while allowance is the intentional difference between two mating parts.

Tolerance is the maximum and minimum limit of a dimension that is acceptable for a part to function properly.
Allowance is the intentional difference between two mating parts to ensure proper fit and function.
Tolerance is specified on the drawing, while allowance is determined during the design process.
Tolerance is usually expressed in units of measurement, while allowance is expressed as a difference between two dimensions.
For example, a shaft with a diameter of 10mm may have a tolerance of +/- 0.1mm, while the hole it fits into may have an allowance of +0.05mm to -0.05mm.

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