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ASME Y14.5-2009 to 2018 Update

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This 12-hour class will highlight the changes in the updated Standard, including new symbols. The layout of Standard has also been revised with all sections being renumbered.

Please Note This can be a Stand-alone class or as part of a 2 or 3 day GD&T class.



Section 1: Introduction to The ASME Y14.5 Update

  • Why make a revision to the Y14.5 Standard?
  • Principal Changes
  • Additions of Section 1 - 4
  • Scope
  • Mandatory, Recommended, Guidance and Optional Words
  • Section 2: References

  • Cited Standards
  • Section 3: Definitions

  • Boundary Inner and Outer Boundary
  • Boundary Least Material and Maximum Material Boundary
  • Datum Feature Simulator
  • Free State, Pattern, Regardless of Feature Size, Restrained
  • New Definitions
  • Deleted Definitions
  • Section 4: Fundamental Rules, Tolerancing, Defaults and Dimensioning Practices

  • Fundamental Rules
  • Repetitive Features and Dimensions
  • Section 5: Tolerancing, Interpretation of Limits, Limits of Size, and Material Condition Modifiers

  • Tolerance Expression
  • Angle Tolerances
  • Tolerance Accumulation Between Surfaces
  • Rule #1 The Envelope Principle (Variations of Form)
  • Exception of Rule #1
  • Directly Toleranced Radius
  • Controlled Radius Tolerance
  • Section 6: Symbology

  • Datum Target Symbol
  • Free State Symbol
  • Continuous Feature
  • Moveable Datum Targets
  • Dynamic Profile Tolerance Zone Modifier
  • From-To Symbol
  • Projected Tolerance Zone
  • Section 7: Datum Reference Frames

  • The Geometric Counterpart
  • Unit Vectors
  • Datum Feature Controls
  • Datum Features Applicable RMB
  • Effects of Straightness of Datum Simulation
  • Determining a Worst-Case Material Boundary
  • Translation Modifier
  • Common Datum Features
  • Offset Planar Datum Feature
  • Restrained Condition
  • Datum Reference Frame Identification
  • Customized Datum Reference Frames & Composite Tolerances
  • Section 8: Form

  • Form Controls on Continuous Features
  • LMC and Straightness
  • Circularity Feature Control Frame
  • Cylindricity Feature Control Frame
  • Section 9: Orientation

    Section 10: Tolerances

  • Concentricity
  • Symmetry
  • MMC Intended for Clearance Fit Applications
  • Projected Tolerance Zone
  • Identifying Multiple Features of Size Within a Pattern
  • Separate Requirements Allowed for Datums Referenced at LMB
  • Section 11: Profile

  • Unilateral and Unequally Disposed Profile Tolerance
  • Additional Nonuniform Tolerance Zone Specification Method
  • Profile on Nonsize Datum Features
  • When the Toleranced Feature Includes Datum Targets
  • Profile with Continuous Feature
  • Orientation of Line Element Using Profile
  • Dynamic Profile Tolerance Zone
  • Section 12: Runout

  • Designed Interruptions are Ignored for Inspection
  • New Toleranced Zone Descriptions
  • Relationship Between Runout and Size Tolerances
  • Runout on a Tangent Plane
  • Runout Relative to an Axis of Rotation in an Assembly
  • Additional Information:

    Free phone and email consultation is available following the course

    All courses are taught in accordance with the ASME/ANSI unless requested otherwise

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