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Difference between positive tolerance and negative tolerance of spiral steel pipe
Nov 29, 2018

A. Screw pipe deviation: in the production process, because the actual size is difficult to meet the nominal size requirements, that is, often greater than or less than the nominal size, so the standard stipulates that there is A difference between the actual size and the nominal size is allowed. If the difference is positive, it is called a positive deviation; if the difference is negative, it is called a negative deviation.

B. Screw pipe tolerance: the sum of the absolute values of positive and negative deviations specified in the standard is called tolerance, also known as "tolerance zone".

Deviation is directional, that is, "positive" or "negative"; Tolerance has no direction, therefore, it is wrong to call the deviation value "positive tolerance" or "negative tolerance".

Difference between %22positive tolerance%22 and %22negative tolerance%22 of spiral steel pipe

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