Dimensioning And Tolerancing Asme Y14.5m-1994 -

The standard relies on several fundamental rules that guide how dimensions and tolerances are applied:

Controls the shape of a feature regardless of its location or orientation. Parallelism, Perpendicularity, Angularity Controls the rotation of a feature relative to a datum. Location Position, Concentricity, Symmetry Dimensioning and Tolerancing ASME Y14.5M-1994

Dimensioning and tolerancing must be fully specified so there is a complete understanding of every feature's requirements. The standard relies on several fundamental rules that

Imaginary, mathematically perfect points, axes, or planes used as reference points for measurements. mathematically perfect points

Modifiers like Maximum Material Condition (MMC) allow for "bonus tolerance" as the part’s actual size deviates from its limit, providing flexibility for manufacturing without sacrificing assembly. Y14.5M-1994 - Dimensioning and Tolerancing - ANSI Webstore

Unless otherwise specified, the limits of size of an individual feature of size control both the size and the form (shape) of that feature.