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General Tolerances(Excerpt from JIS B 0405 1991/JIS B 0419 1991）

Last updated:18 June 2019

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Tolerance for the Lengths Excluding the Chamfer Portions Unit [mm]

Tolerance class Standard size classification
Symbol Description 0.5or more
3 or below		 Over 3
6 or below		 Over 6
30 or below		 Over 30
120 or below		 Over 120
400 or below		 Over 400
1000 or below		 Over 1000
2000 or below		 Over 2000
4000 or below
Tolerance
f Fine ±0.05 ±0.05 ±0.1 ±0.15 ±0.2 ±0.3 ±0.5 -
m Medium ±0.1 ±0.1 ±0.2 ±0.3 ±0.5 ±0.8 ±1.2 ±2
c Coarse ±0.2 ±0.3 ±0.5 ±0.8 ±1.2 ±2 ±3 ±4
v Very coarse - ±0.5 ±1 ±1.5 ±2.5 ±4 ±6 ±8
* For standard sizes of 0.5 mm or less, the individual tolerance is added to the respective standard size.

Tolerance for Lengths of Chamfer Portions (Corner Roundness and Corner Chamfer Sizes) Unit [mm]

Tolerance class Standard size classification
Symbol Description 0.5or more
3 or below		 Over 3
6 or below		 Over 6
Tolerance
f Fine ±0.2 ±0.5 ±1
m Medium
c Coarse ±0.4 ±1 ±2
v Very coarse
* For standard sizes of 0.5 mm or less, the individual tolerance is added to the respective standard size.

Tolerance for the Angular Sizes

Tolerance class Category of target angle's shorter side length (mm)
Symbol Description 10 or below Over 10
50 or below		 Over 50
120 or below		 Over 120
400 or below		 Over 400
Tolerance
f Fine ±1° ±30′ ±20′ ±10′ ±5′
m Medium
c Coarse ±1°30′ ±1° ±30′ ±15′ ±10′
v Very coarse ±3° ±2° ±1° ±30′ ±20′

General Tolerance of Straightness and FlatnessUnit [mm]

Tolerance class Nominal length category
10 or below Over 10
30 or below		 Over 30
100 or below		 Over 100
300 or below		 Over 300
1000 or below		 Over 1000
3000 or below
Straightness tolerance and flatness tolerance
H 0.02 0.05 0.1 0.2 0.3 0.4
K 0.05 0.1 0.2 0.4 0.6 0.8
L 0.1 0.2 0.4 0.8 1.2 1.6

General Tolerance of Straightness and Flatness Unit [mm]

Tolerance class Nominal short side length classification
100or below Over 100
300 or below		 Over 300
1000 or below		 Over 1000
3000or below
Straightness tolerance
H 0.2 0.3 0.4 0.5
K 0.4 0.6 0.8 1
L 0.6 1 1.5 2

General Tolerance of Symmetry Unit [mm]

Tolerance class Nominal length classification
100 or below Over 100
300 or below		 Over 300
1000 or below		 Over 1000
3000 or below
Symmetry tolerance
H 0.5
K 0.6 0.8 1
L 0.6 1 1.5 2

General Tolerance of Circumferential Deflection Unit [mm]

Tolerance class Circumferential deflection tolerance
H 0.1
K 0.2
L 0.5

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