When manufacturing the lock nut, in order to make the lock nut interchangeable, the size of the part is required to be within a reasonable range, and thus the limit size is specified. The actual size after manufacture should be within the specified maximum limit size and minimum limit size range. The allowable size variation is called dimensional tolerance, or tolerance for short.
Standard tolerance: The value of standard tolerance IT is basically any tolerance listed in the standard to confirm the size of the tolerance zone. The standard tolerance is divided into 20 levels, namely: IT01, IT02, IT1 to IT18. IT stands for standard tolerance, and the number stands for tolerance level. IT01 has the smallest tolerance value and the highest precision; IT18 has the largest tolerance value and the lowest precision.
Basic size: Design the given size.
Limit size: The two limit values of allowable size changes, which are determined based on the basic size.
Deviation: The algebraic difference of a certain actual size minus its basic size.
Limit deviation: refers to the upper deviation and the lower deviation. The algebraic difference obtained by subtracting the basic size from the maximum limit size is the upper deviation; the algebraic difference obtained by subtracting the basic size from the minimum limit size is the lower deviation.
Dimensional tolerance: the amount of variation allowed. That is, the difference between the maximum limit size and the minimum limit size; also equal to the absolute value of the algebraic difference between the upper deviation and the lower deviation.
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