STANDARD Drafting Practices Table 5. ISO Geometric Symbols ISO 1101:2017 GEOMETRIC SYMBOLS Table 5. ISO Geometric Symbols ISO 1101:2017 Machinery's Handbook, 31st Edition
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Symbol for
Symbol for
Independency
Default
Straightness
Flatness
Dynamic ProfileTolerance
Circularity
From /To
Cylindricity
Diameter
Angularity
Theoretically Exact Dimension
50
Perpendicularity
Auxiliary Dimension
(50)
Datum Feature (triangle may be filled in or not)
Parallelism
A
Dimension Origin
Position
Feature Control Frame
Concentricity and Coaxiality
C 0.5 M A B
Conical Taper
Symmetry
Profile of a Line
Slope
Profile of a Surface
Square
15
Dimension Not to Scale
Circular Runout
Total Runout
Number of Places
8x
Arc Length
AllAround
105
All Over
Radius
R
At Maximum Material Condition
Spherical Radius
M
SR
At Least Material Condition
Spherical Diameter
L
S
Between (arrowheads may be filled in or not)
ProjectedTolerance Zone
P
6
6
Tangent Plane
Datum Target
T
or
A1
A1
Free State
Movable DatumTarget
F
A1
Target Point
Unequally Disposed Profile
UZ
Envelope Principle
E
Note: This table includes the most commonly used symbols; for additional symbols, refer to the standard.
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