TYPE OF 
TOLERANCE

CHARACTERISTIC
AND SYMBOL

DATUM
REFERENCE

IMPLIED
CONDITION

ALLOWABLE
MATERIAL MODIFIERS

TOLERANCE
ZONE SHAPE

KEY POINTS TO REMEMBER

ORIENTATION

PARALLELISM

YES

RFS

MMC OR LMC
ON THE 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.

PARALLELISM:
The condition if a surface or center plane, equidistant at all points from a datum plane or axis.

PARALLELISM TOLERANCE ZONE:
Defined by one of the following: