TYPE OF 
TOLERANCE

CHARACTERISTIC
AND SYMBOL

DATUM
REFERENCE

IMPLIED
CONDITION

ALLOWABLE
MATERIAL MODIFIERS

TOLERANCE
ZONE SHAPE

KEY POINTS TO REMEMBER

FORM

CIRCULARITY

NONE

RFS

NONE


TOTAL WIDTH
TOLERANCE
ZONE BETWEEN
TWO CONCENTRIC
CIRCLES
  1. COMPARES TO A PERFECT
    COUNTERPART OF ITSELF
    (PLANE)
  2. NOT ADDITIVE TO SIZE OR
    LOCATION LIMITS

CIRCULARITY:
The condition of a surface where all points of the surface resulting from the intersection of that surface with a plane perpendicular to an axis (cylinder, cone) are equidistant from that axis. For a sphere the plane goes through the center and all points are equidistant from the center.

CIRCULARITY TOLERANCE ZONE:
A tolerance zone bounded by two concentric circles within which each circular element of the surface must lie.