A. Spiral steel pipe deviation: In the production process, since the actual size is difficult to achieve the nominal size requirement, that is, it is often larger or smaller than the nominal size, the standard specifies that a difference is allowed between the actual size and the nominal size. A positive deviation is a positive deviation, and a negative value is a negative deviation.
B. Spiral steel pipe tolerance: The sum of the absolute values ​​of the positive and negative deviation values ​​specified in the standard is called tolerance, also called “tolerance zoneâ€.
The deviation is directional, that is, it is expressed as "positive" or "negative"; the tolerance is not directional, so it is wrong to call the deviation value "positive tolerance" or "negative tolerance".
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