Limits And Fits

The formulas for positional tolerancing are also applicable where requirements for the size and fit of mating features are specified by symbols. See ANSI B4.2, which explains the use of symbols. For preferred sizes and fits, tables are provided therein giving the appropriate MMC limits. For other fit conditions, these limits must be calculated using tables in the appendix that list deviations from the basic size for each tolerance zone symbol (alphanumeric designation).

EXAMPLE: Given the parts shown in Fig. B-3, where requirements for mating features are specified as follows:

20//9 in place of 20 o 2(W9 in place of 19.95_o.Q5 10/f9 in place of 10*o 05

Dimensioning Limits And Fits

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