Machinery's Handbook, 31st Edition
626
STANDARD Drafting Practices Table 6. ASME Geometric Control Symbols ASME Y14.5-2018 GEOMETRIC SYMBOLS Table 6.ASME Geometric Control Symbols ASME Y14.5-2018
Feature Modifier
Datum Modifier
Basic Dimensions
Type a Geometric Characteristics
Pertains To
Straightness
See
1 Note
Only individual feature
Flatness
Not applicable
No datum
Circularity
Modifier not applicable
Cylindricity
Profile of a Line
Yes if related
Individual or related
Profile of a Surface
Angularity
Yes
Perpendicularity
Not applicable
Parallelism
See
1 Note
See
1 Note
Always related feature(s)
Position
Yes
b
Circular Runout
Not applicable
Only RFS
b
Total Runout
Note 1: Default RFS unless MMC or LMC explicitly stated.
Five types of geometric control, when datums are indicated, when basic dimensions are required, and when MMC and LMC modifiers may be used. a Arrowheads may be filled in or not. b
ANSI/ASME and ISO Orthographic Projections
(b) Top
(e) Bottom
(c) Left
(a) Front [primary view]
(f) Back
(d) Right
(d) Right
(a) Front [primary view]
(c) Left
(f) Back
VIEWS IN THIRD ANGLE PROJECTION (DEFAULT IN ANSI/ASME)
VIEWS IN FIRST ANGLE PROJECTION (DEFAULT IN ISO)
(b) Top
(e) Bottom
ANSI/ASME Fig. 1a. ANSI/ASME–Orthographic Projection Following Third Angle Projection
ISO
Fig. 1b. ISO–Orthographic Projection Following First Angle Projection
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