Direct Tolerancing Methods

Limits and directly applied tolerance values are specified as follows.

(a) Limit Dimensioning. The high limit (maximum value) is placed above the low limit (minimum value). When expressed in a single line, the low limit precedes the high limit and a dash separates the two values. See Fig. 2-1.

(b) Plus and Minus Tolerancing. The dimension is given first and is followed by a plus and minus expression of tolerance. See Fig. 2-2.

2.2.1 Metric Limits and Rts For metric application of limits and fits, the tolerance may be indicated

(a)

29.980 . „ „V 29.959 <30

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