“Two past practices, use of concentricity and use of symmetry have been eliminated because other characteristics provide more direct control of features and establish requirements that have a well-defined meaning. (phew!) Removed symbols:Ĭoncentricity, definition and symbol, has been removed The layout of standard has been revised as well – all sections have been renumbered but the order of information hasn’t changed. Figures have been updated to include model-based application of dimensions and tolerances. An addition of updated figures accounts for this volume increase. The new standard is much thicker than the previous – 328 pages, a whooping increase in size from 214.
ASME has just released Y14.5-2018 Dimensioning and Tolerancing Standard.īelow is a highlight of handful of changes at first glance.
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