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Illustration Method of Geometric Tolerances

 Excerpt from JIS b0021 (1998)

■ Types of geometric tolerances and their symbols

Types of tolerance
Characteristic symbol
Definition of tolerance zone
Illustration and interpretation

 
 
 
 

 
 
 
 

 
 
 
 

 
 
 

Shape
tolerance
 
Straightness tolerance
 
Flatness tolerance
 
Roundness tolerance
 
Cylindrical tolerance
Line Contour Tolerance: Line contour tolerance not related to datum (ISO 1660)
Surface Contour Tolerance: Surface contour tolerance not related to datum (ISO 1660)
 
Types of tolerance
Characteristic symbol
Definition of tolerance zone
Illustration and interpretation

 
 
 
 

 
 
 
 

 
 
 
 

 
 
 
 


Attitude
tolerance

 
 
 
 

 
 
 

Parallelism
tolerance
  1. Parallelism tolerance of lines related to Datum straight line
  2. Parallelism tolerance of the line associated with the datum plane

 
 
 
 

Square
tolerance
  1. Right angle tolerance of line related to datum axis line
  2. Linear angle tolerance of the line relative to the datum plane

 
 
 
 

Slope
tolerance
  1. Linear slope tolerance relative to datum plane
  2. Slope tolerance of the plane relative to datum plane
 
Types of tolerance
Characteristic symbol
Definition of tolerance zone
Illustration and interpretation

 
 
 
 

 
 
 
 

 
 

Position
tolerance

 

Position angle
tolerance
  1. Line position angle tolerance

 
 

Concentricity
tolerance
and
coaxiality
tolerance
Symmetry tolerance
(Symmetry tolerance
of center plane)

 
 
 
 

 
 
 
 

Runout
tolerance

 
 
 
 
 

Circumferential deflection tolerance
  1. Circumferential runout tolerance - radial direction
  2. Circumferential runout tolerance - axis direction
Full runout tolerance: Total runout tolerance in the circumferential direction
 
The lines used in the definition column of the tolerance zone represent the following meanings.
 
Thick solid line or broken line: Form
Thick dash-dotted line: Datum
Thin solid line or broken line: Tolerance area
Thin dotted line: center line
Thin two-dot chain line: Supplementary projection plane or section
Thick, two-dot chain line: projection of feature on supplemental projection plane or section
 

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