GD&T New Standard ASME Y14.5 2009

American Society of Mechanical Engineers (ASME) has updated the GD&T Standard in March 2009, and the updated version ASME Y14.5 – 2009 is now in effect.

Below are the brief changes/updates in this Standard:

  • Datum feature Simulators (Theoretical & Physical)

  • Datum Definitions -> Maximum Material Boundary (MMB), Least Material Boundary (LMB) and Regardless of Material Boundary (RMsB)

  • Definitions of Related and Unrelated Actual Mating Envelopes (AMEs)

  • Regular and Irregular Features of Size

  • Interdependency Symbol

  • New “All Over” Symbol

  • Continuous Features

  • Unequally disposed profile tolerances

  • Datum Translation modifier

  • Movable Datum Targets

  • Flatness Tolerance to control the derived median plane of a Feature of Size

  • Degrees of Freedom arrested by Datums

  • Specifying the maximum geometric tolerance in the frame to limit the Bonus

  • Three segment Composite Tolerance frame

Feel free to contact us to know more details.