GD & T Symbols and definitions

 What is GD & T ?

( GEOMERICAL DIMENSIONING AND TOLERANCING ) 

• It a symbolic language 
• Is a design tool
• that communication design intent 

GD & T SYMBOLS 

DEFINIATIONS

CATEGORY :- FORM

Straightness 

A condition where an element of a surface or an axis is straight line.

Flatness

Is the condition of a surface having all element in one plane.

Circularity or roundness 

Describes the condition on a surface of revolution (cylinder, cone, sphere) where all points of the surface intersected by any plane.

Cylindricity 

Describes a condition of a surface of revolution in which all points of a surface are equidistant from a common axis.

CATEGORY :- PROFILE 

Profile of a Line

Is the condition permitting a uniform amount of profile variation, ether unilaterally or bilaterally, along a line element of a feature.

Profile of a Surface

Is the condition permitting a uniform amount of profile variation, ether unilaterally or bilaterally, on a surface.

CATEGORY :- ORIENTATION 

Angularity

Is the condition of a surface, axis, or centerplane, which is at a specified angle from a datum

plane or axis.

Perpendicularity

is the condition of a surface, axis, or line, which is 90 deg. From a datum plane or a datum axis.

Parallelism

Is the condition of a surface, line, or axis, which is equidistant at all points from a datum plane or axis.

CATEGORY :- LOCATION 

Position

defines a zone within which the axis or center plane of a feature is permitted to vary

from true (theoretically exact) position.

Concentricity

describes a condition in which two or more features , in any combination, have a common axis.

Symmetry

Is a condition in which a feature (or features) is symmetrically disposed about the center plane of a datum feature.

CATEGORY :- RUNOUT

Runout

Is the composite deviation from the desired form of a part surface of revolution through on full rotation (360 deg) of the part on a datum axis.

Total Runout

Is the simultaneous composite control of all elements of a surface at all circular and profile measuring positions as the part is rotated through 360.

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