IMTMA Training Centre

Online Training on Enhancements in GD&T as per ASME Y14.5 2009 and 2018 versions

Focus Areas

  • Addition of new symbols
  • Datum: Explanation of DOF, new Datum features, customised Datum Reference Frame, New terms- RMB,MMB and LMB, Datum translation modifier, Movable datum target
  • Actual Minimum Material Envelope, Related and Unrelated Actual Mating Envelope, Irregular Features of size
  • Removal of Concentricity and Symmetry
  • Addition of Dynamic Profile tolerance, All over symbol, Unequally disposed symbol, profile tolerance for location tolerances applied to surfaces


ASME Y14.5 (Standard for Geometric Dimensioning and Tolerancing) has been revised from time to time in line with the advances, requirements of the industry and to enhance its effectiveness. The past 2 revisions of ASME Y14.5 standards - one in 2009 and other in 2018 are considerable enhancements over the earlier version (Y14.5M-1994), which further empower the designers in defining the intended function of the part.

Key Takeaways

  • Understand the changes and enhancements in the latest ASME Y14.5 standards
  • Implement / utilize new features in the latest standards to fully convey the design intent to the manufacturing and inspection departments

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