QUALITY
The Tolerance Standards
Table 1 - Permissible deviations for linear dimensions except for broken edges
Unit：mm
Tolerance-class
Permissible deviations for ranges in nominal lengths
0.5~3
>3~6
>6~30
>30~120
>120~400
>400~1000
f
Fine
±0.05
±0.05
±0.1
±0.15
±0.2
±0.3
m
Medium
±0.1
±0.1
±0.2
±0.3
±0.5
±0.8
c
Coarse
±0.2
±0.3
±0.5
±0.8
±1.2
±2
v
Verycoarse
-
±0.5
±1
±1.5
±2.5
±4
* For nominal sizes below 0.5 mm, the deviation shall be indicated adjacent to the relevant nominal size(s)
Table 2 – Permissible deviations for brokenedges
(external radii and chamfer height)
Unit：mm
Tolerance-class
Permissible deviations for ranges in nominal lengths
0.5~3
>3~6
>6~30
f
Fine
±0.2
±0.5
±1
m
Medium
c
Coarse
±0.4
±1
±2
v
Very coarse
* For nominal size below 0.5 mm, the deviation shall be indicated adjacent to the relevant nominal size(s)
Table 3 – Permissible deviations for angulardimensions
Unit：degree, minute
Tolerance-class
Permissible deviations in degrees and minutes for ranges in nominal lengths
0~10
>10~50
>50~120
>120~400
>400
f
Fine
±1º
±0º30’
±0º20’
±0º10’
±0º5’
m
Medium
c
Coarse
±1º30’
±1º
±0º30’
±0º15’
±0º10’
v
Very coarse
±3º
±2º
±1º
±0º30’
±0º20’
* For nominal size below 0.5 mm, the deviation shall be indicated adjacent to the relevant nominal size(s)
Unless specificallyrequired, if the performance is not worsened, workpieces out of tolerance indimension should not be automatically rejected
Table 1. General tolerances for straightness and evenness
Unit：mm
Tolerance-class
Tolerances for straighness and eveness for ranges in nominal lengths
—
□
0~10
>10~30
>30~100
>100~300
>300~1000
H
0.02
0.05
0.1
0.2
0.3
K
0.05
0.1
0.2
0.4
0.6
L
0.1
0.2
0.4
0.8
1.2
Straightness is based on the lengths of thecorresponding lines, and evenness is based on long edges or diameters of thecorresponding rectangles or circles, respectively.
l Roundness (o) : The general tolerance for roundness isequal to the tolerance of diameter, but in no case is the tolerance allowed toexceed the circle run-out tolerance (see table 4)
l Cylindricity（/○/） : The general tolerance for cylindricity is not specifically confined
l Parallelism (∥) : The general tolerance for parallelism is equal in value to sizetolerance or the larger one between flatness and straightness tolerance
l Verticality (⊥) : The general tolerance for verticality is based on the longer onebetween the two legs of the right angle(See Table-2)
Table 2. The general tolerance for verticality
Unit：mm
Tolerance-class
The general tolerance for verticality of short edges for ranges in nominal lengths
⊥
0~100
>100~300
>300~1000
>1000~3000
H
0.2
0.3
0.4
0.5
K
0.4
0.6
0.8
1
L
0.6
1
1.5
2
l Symmetry（≡）The general tolerance for symmetry is shown inTable-3
Table 3. The general tolerance for symmetry
Unit：mm
Tolerance-class
The general tolerance for symmetry for ranges in nominal lengths
≡
0~100
>100~300
>300~1000
>1000~3000
H
0.5
K
0.6
0.8
1
L
0.6
1
1.5
2
l Concentricity（◎）：Thegeneral tolerance for concentricity is not specificaly defined
l Circle runout（↗）：The general tolerance for circle run out (radii,axises and rotary surfaces) is shown in Table-4
Table 4. The general tolerance forcircle run-out
Tolerance-class
Circle run-out tolerance↗
H
0.1
K
0.2
L
0.5
Unless specificallyrequired, if the performance is not worsened, workpieces out of tolerance indimension should not be automatically rejected.
Table 1 - Permissible deviations for linear dimensions except for broken edges
Unit：mm
Tolerance-class
Permissible deviations for ranges in nominal lengths
0.5~3
>3~6
>6~30
>30~120
>120~400
>400~1000
f
Fine
±0.05
±0.05
±0.1
±0.15
±0.2
±0.3
m
Medium
±0.1
±0.1
±0.2
±0.3
±0.5
±0.8
c
Coarse
±0.2
±0.3
±0.5
±0.8
±1.2
±2
v
Verycoarse
-
±0.5
±1
±1.5
±2.5
±4
* For nominal sizes below 0.5 mm, the deviation shall be indicated adjacent to the relevant nominal size(s)
Table 2 – Permissible deviations for brokenedges
(external radii and chamfer height)
Unit：mm
Tolerance-class
Permissible deviations for ranges in nominal lengths
0.5~3
>3~6
>6~30
f
Fine
±0.2
±0.5
±1
m
Medium
c
Coarse
±0.4
±1
±2
v
Very coarse
* For nominal size below 0.5 mm, the deviation shall be indicated adjacent to the relevant nominal size(s)
Table 3 – Permissible deviations for angulardimensions
Unit：degree, minute
Tolerance-class
Permissible deviations in degrees and minutes for ranges in nominal lengths
0~10
>10~50
>50~120
>120~400
>400
f
Fine
±1º
±0º30’
±0º20’
±0º10’
±0º5’
m
Medium
c
Coarse
±1º30’
±1º
±0º30’
±0º15’
±0º10’
v
Very coarse
±3º
±2º
±1º
±0º30’
±0º20’
* For nominal size below 0.5 mm, the deviation shall be indicated adjacent to the relevant nominal size(s)
Unless specificallyrequired, if the performance is not worsened, workpieces out of tolerance indimension should not be automatically rejected
Table 1. General tolerances for straightness and evenness
Unit：mm
Tolerance-class
Tolerances for straighness and eveness for ranges in nominal lengths
—
□
0~10
>10~30
>30~100
>100~300
>300~1000
H
0.02
0.05
0.1
0.2
0.3
K
0.05
0.1
0.2
0.4
0.6
L
0.1
0.2
0.4
0.8
1.2
Straightness is based on the lengths of thecorresponding lines, and evenness is based on long edges or diameters of thecorresponding rectangles or circles, respectively.
l Roundness (o) : The general tolerance for roundness isequal to the tolerance of diameter, but in no case is the tolerance allowed toexceed the circle run-out tolerance (see table 4)
l Cylindricity（/○/） : The general tolerance for cylindricity is not specifically confined
l Parallelism (∥) : The general tolerance for parallelism is equal in value to sizetolerance or the larger one between flatness and straightness tolerance
l Verticality (⊥) : The general tolerance for verticality is based on the longer onebetween the two legs of the right angle(See Table-2)
Table 2. The general tolerance for verticality
Unit：mm
Tolerance-class
The general tolerance for verticality of short edges for ranges in nominal lengths
⊥
0~100
>100~300
>300~1000
>1000~3000
H
0.2
0.3
0.4
0.5
K
0.4
0.6
0.8
1
L
0.6
1
1.5
2
l Symmetry（≡）The general tolerance for symmetry is shown inTable-3
Table 3. The general tolerance for symmetry
Unit：mm
Tolerance-class
The general tolerance for symmetry for ranges in nominal lengths
≡
0~100
>100~300
>300~1000
>1000~3000
H
0.5
K
0.6
0.8
1
L
0.6
1
1.5
2
l Concentricity（◎）：Thegeneral tolerance for concentricity is not specificaly defined
l Circle runout（↗）：The general tolerance for circle run out (radii,axises and rotary surfaces) is shown in Table-4
Table 4. The general tolerance forcircle run-out
Tolerance-class
Circle run-out tolerance↗
H
0.1
K
0.2
L
0.5
Unless specificallyrequired, if the performance is not worsened, workpieces out of tolerance indimension should not be automatically rejected.
