Tolerances, ContinuedSize,DESIGN SIZE: The size from which you derive the limits of size by the use(Continued)of tolerances.Figure 3-36 indicates object size.AllowanceFigure 3-36.—Indicating object size.Limits, allowance, unilateral tolerance, and bilateral tolerance refer to sizeallowable variations.LIMITS: The maximum and minimum sizes indicated by a toleranceddimension. For example, the limits for a hole are 1.500 and 1.501 inchesand for a shaft 1.498 and 1.497 inches.ALLOWANCE: The intentional difference between the maximum materiallimits of mating parts. This is a minimum clearance (positive allowance) ormaximum interference (negative allowance) between mating parts.UNILATERAL TOLERANCE: Unilateral tolerances indicate variation fromthe design size in one direction.Continued on next page3-41
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