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