How to give General tolerance for (GD & T) Geometric Dimension and Tolerance as per standard
GD & T General Tolerance Values
Straightness and flatness
The general tolerances on straightness and flatness are given in below table. When a tolerance is selected from this table, it shall be based, in the case of straightness, on the length of the corresponding line and, in the case of flatness, on the longer lateral length of the surface, or the diameter of the circular surface.
Perpendicularity :
The general tolerances on perpendicularity are given in below Table. The longer of the two sides forming the right angle shall be taken as the datum; if the sides are of equal nominal length, either may be taken as the datum.
Symmetry :
The general tolerances on symmetry are given in below Table. The longer of the two features shall be taken as the datum; if the features are of equal nominal length, either may be taken as the datum.
Circular Run Out:
The general tolerances on circular run-out (radial, axial and any surface of revolution) are given in below Table. For general tolerances on circular run-out, the bearing surfaces shall be taken as the datum if they are designated as such. Otherwise, for circular radial run-out, the longer of the two features&all be taken as the datum; if the features are of equal nominal length, either may be taken as the datum.
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