TYPE OF 
TOLERANCE

CHARACTERISTIC
AND SYMBOL

DATUM
REFERENCE

IMPLIED
CONDITION

ALLOWABLE
MATERIAL MODIFIERS

TOLERANCE
ZONE SHAPE

KEY POINTS TO REMEMBER

ORIENTATION

PERPENDICULARITY

YES

RFS

MMC OR LMC
ON TOLERANCE IF THE TOLERANCE IS APPLIED TO A FEATURE OF SIZE OR ON A DATUM REFERENCE IF THE DATUM IS A FEATURE OF SIZE.


TOTAL WIDTH

CYLINDRICAL
  1. RELATION TO MORE THAN ONE DATUM FEATURE SHOULD BE CONSIDERED TO STABILIZE THE TOLERANCE ZONE IN MORE THAN ONE DIRECTION.

PERPENDICULARITY:
The condition of a surface, center plane, or axis which is at a right angle to a datum plane or axis.

PERPENDICULARITY TOLERANCE ZONE:
Defined by one of the following: