Key Points
Perpendicularity is the condition of a surface, median plane, or axis oriented at 90˚ to the datum reference frame.
Example Drawing
Application
Two surfaces must be perpendicular when part is mounted on bottom surface.
How to Read It
Perpendicularity is a 3D tolerance and if applied to a plane surface, it also controls the flatness.
Sample Inspection
The part is mounted on datum feature A and the surface to be verified is leveled. The full indicator movement must not exceed 0.1 (max-min).