TYPE OF 
TOLERANCE

CHARACTERISTIC
AND SYMBOL

DATUM
REFERENCE

IMPLIED
CONDITION

ALLOWABLE
MATERIAL MODIFIERS

TOLERANCE
ZONE SHAPE

KEY POINTS TO REMEMBER

FORM

FLATNESS

NONE

RFS

NONE


TOTAL WIDTH
  1. COMPARES TO A PERFECT
    COUNTERPART OF ITSELF
    (PLANE)
  2. NOT ADDITIVE TO SIZE OR
    LOCATION LIMITS
  3. NO PARTICULAR
    ORIENTATION

FLATNESS:
A condition of a surface having all elements in one plane

FLATNESS TOLERANCE ZONE:
A tolerance zone is defined by two parallel planes within which the entire surface must lie.