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Geometric Tolerancing


There are several standards available worldwide to describe the symbols and the rules. These are American Society of Mechanical Engineers, ASME Y14.5M-2009,  (GD&T - Geometric Dimensioning and Tolerancing) and International Organization for Standardization, ISO/TC 213, (GPS - Geometrical Product Specification) and ISO/TC 10 Technical Product Documentation (see the ISO GPS Specifications and verification List). The ISO (GPS) standards are typically only address a single topic at a time.ISO/TC 213 is a technical committee that standardizes tolerancing and related metrological practices. ASME Y14.5M standard has the advantage of providing a fairly complete set of standards for GD & T in one document.


Geometric Tolerancing Reference Chart ASME Y14.5M And ISO/TC 213


TolerancesCharacteristics Symbols Datum
Needed
Applicable Modifiers
(RMS, LMC, MMC)
FormStraightness
No LMC or MMC can
apply to feature of size
FormFlatness
NoDoes not apply
FormCircularity
NoDoes not apply
FormCylindricity
NoDoes not apply
ProfileLine Profile
NoDoes not apply
ProfileSurface Profile
NoDoes not apply
OrientationPerpendicularity
Yes LMC or MMC can
apply to feature of size
OrientationAngularity
Yes LMC or MMC can
apply to feature of size
OrientationParallelism
Yes LMC or MMC can
apply to feature of size
LocationSymmetry
Yes RFS always
LocationPositional
Yes And No LMC or MMC can
apply to feature of size
LocationConcentricity
Yes RFS always
RunoutCircular Runout
Yes RFS always
RunoutTotal Runout
Yes RFS always

Additional Geometric Tolerancing Symbol Chart ASME Y14.5M And ISO/TC 213


 DescriptionSymbolsReferences
 Max Material Condition (MMC)
ISO 2692/ASME
 Least Material Condition (LMC)
ISO 2692/ASME
 Regardless Of Feature Size (RFS)
ISO/ASME
 Spherical Diameter (SD)
ISO/AMSE
 Radius
ISO/ASME
 Diameter
ISO/ASME
 Envelope Requirement
ISO/ASME
 Free State Condition(Non Rigid Parts)
ISO 10579/ASME
 Minor Diameter
ISO/ASME
 Major Diameter
ISO/ASME
 Pitch Diameter
ISO/ASME
 Common Zone
ISO/ASME
 Exact Dimension
ISO/ASME
 Dimension Origin
ISO/ASME
 All Round (Profile)
ISO NONE/ASME
 Datum Feature Indication
ISO/ASME
 Datum Target Indication
ISO 5459
 Projected Tolerance Zone
ISO 10578/ASME

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