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Deviation and tolerance of steel pipe
Jul 03, 2017

Deviation: A, in the production process, because the actual size is difficult to achieve the nominal size requirements, which is often greater than or less than the nominal size, so the standard provides a difference between the actual size and nominal size allowed. If the difference is positive, it is called a positive deviation, and the negative value is called a negative deviation.

B and tolerance: the sum of the positive and negative deviation values specified in the standard is called tolerance, also called tolerance zone".

Deviations are directional, i.e., "positive" or "negative"; tolerances are not directional; therefore, it is wrong to refer to deviations as "positive tolerances" or "negative tolerances".

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