Page 1659 - MiSUMi 2025

[Technical Data]
Regular Machining Dimension Tolerance Excerpts from JIS B 0405, 0419 (1991)

1. Regular Cutting Dimension Tolerance B 0405－1991

Tolerance of length dimensions excluding chamfered portions Unit: mm
Tolerance Class Classification of Reference Dimension
0.5 ( 1 ) or More Greater than Greater than Greater than Greater than Greater than Greater than Greater than
2000 up to
1000 up to
Symbol Description 3 or Less 3 up to 6 6 up to 30 30 up to 120 120 up to 400 400 up to 1000 2000 4000
Tolerance
f Fine Grade Ú0.05 Ú0.05 Ú0.1 Ú0.15 Ú0.2 Ú0.3 Ú0.5 一
m Medium Grade Ú0.1 Ú0.1 Ú0.2 Ú0.3 Ú0.5 Ú0.8 Ú1.2 Ú2
c Coarse Grade Ú0.2 Ú0.3 Ú0.5 Ú0.8 Ú1.2 Ú2 Ú3 Ú4
v Extra Coarse Grade 一 Ú0.5 Ú1 Ú1.5 Ú2.5 Ú4 Ú6 Ú8
1
Note ( ) : A reference dimension less than 0.5 mm is followed by a tolerance.
2. Tolerance of length dimensions of 3. Angle Tolerance
chamfered portions (including corner
rounding and chamfer dimensions)
Unit: mm Unit: mm
Tolerance Class Classification of Reference Dimension Tolerance Class Length of Shorter Side (Unit: mm)
0.5 ( ) or Greater Greater Greater Greater
2
More than 3 More than 6 10 or Less than 10 than 50 than 120 More than 400
Symbol Description 3 or Less up to 6 Symbol Description up to 50 up to 120 up to 400
Tolerance Tolerance
f Fine Grade f Fine Grade
m Medium Grade Ú0.2 Ú0.5 Ú1 m Medium Grade Ú1B Ú30V Ú20V Ú10V Ú 5V
c Coarse Grade c Coarse Grade Ú1B 30V Ú 1B Ú30V Ú15V Ú10V
v Extra Coarse Grade Ú0.4 Ú1 Ú2 v Extra Coarse Grade Ú3B Ú 2B Ú 1B Ú30V Ú20V
Note ( ) : A reference dimension less than 0.5
2
mm is followed by a tolerance.
4.Regular Perpendicularity Tolerance B 0419－1991 Unit: mm
Nominal Length of Shorter Side
Tolerance Class 100 or Less Greater than 100 Greater than 300 Greater than 1000
up to 300
up to 1000
up to 3000
Perpendicularity 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
5. Regular Straightness and Flatness Tolerance Unit: mm
Nominal Length
Tolerance Class 10 or Less Greater than 10 Greater than 30 Greater than 100 Greater than 300 Greater than 1000
up to 100
up to 1000
up to 3000
up to 30
up to 300
Regular Straightness 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
6.Regular Symmetry Tolerance Unit: mm
Nominal Length
Tolerance Class 100 or Less Greater than 100 Greater than 300 More than 1000
up to 300
up to 1000
Symmetry Tolerance
H 0.5
K 0.6 0.8 1
L 0.6 1 1.5 2
B-014