ASME_Y14.5M-2009_tolerance_guide20190605-120295-12cen16.pdf

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1. 1
General Tolerance 
(from ASME Y14.5M-2009)
Tolerances can be expressed:
1. directly to a dimension 2. geometric tolerance
3. in a note
4. In a general tolerance block
Limit dimensioning The high limit is placed
above the low limit.

2. 2
Plus and Minus Tolerancing
The dim. is given first and is
followed by a plus and minus
expression of tolerance.

3. 3
Millimeter Tolerances

4. 4
A
B
C
Φ25

5. 5
Inch Tolerances

6. 6
Tolerances Accumulation
1. Chain Dimensioning,
±0.15
2. Base Line Dimensioning,
±0.1
3. Direct Dimensioning,
±0.05

7. 7
Dimensional Limits should
be counted from an origin.

8. 8
Limit of size. •MMC (Maximum Material Condition): The condition in which a
feature size contains max. amount of material withi n the limits of
size.
•LMC (Least Material Condition)

9. 9
Angled Surface
• Where defined by a linear dimension and an angle, the surface lie within the tolerance by two
nonparallel planes.
•Where a tolerance zone with parallel boundaries is desired, the basic angle can be specified in
rectangle.

10. 10
Conical Tapers
Φ23
Φ23

11. 11
Flat Tapers

12. 12
Controlled Radius Tolerance
Radius Tolerance