Page 973 - MiSUMi FA Mechanical Components Economy Series

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

1. Regular Cut Dimension Tolerance B 04051991

Tolerances in Respect of Length Excluding Chamfered Portion Unit: mm
Tolerance Class Classifi cation of Reference Dimension
1
0.5 ( ) or More More than 3 More than 6 More than 30 More than 120 More than 400 More than 1000 More than 2000
Symbol Description 3 or Less 6 or Less 30 or Less 120 or Less 400 or Less 1000 or Less 2000 or Less 4000 or Less
Tolerance
f Precision Grade Ú0.05 Ú0.05 Ú0.1 Ú0.15 Ú0.2 Ú0.3 Ú0.5 ♧
m Medium Ú0.1 Ú0.1 Ú0.2 Ú0.3 Ú0.5 Ú0.8 Ú1.2 Ú2
c Coarse Ú0.2 Ú0.3 Ú0.5 Ú0.8 Ú1.2 Ú2 Ú3 Ú4
v Extremely Coarse ♧ Ú0.5 Ú1 Ú1.5 Ú2.5 Ú4 Ú6 Ú8
Note ( ) : A reference dimension less than 0.5 mm is followed by a tolerance.
1
2.Tolerances in Respect of the Length of the Chamfered Portion 3. Angle Tolerance
(Radius of rounding for edges and edge chamfering dimension)

Unit: mm Unit: mm
Tolerance Class Classifi cation of Reference Dimension Tolerance Class
Length of Shorter Side (Unit: mm)
0.5 ( ) or
2
More More than 3 More than 6 More than 10 More than 50 More than 120
Symbol Description 3 or Less 6 or Less Symbol Description 10 or Less 50 or Less 120 or Less 400 or Less More than 400
Tolerance Tolerance
f Precision Grade f Precision Grade
m Medium Ú0.2 Ú0.5 Ú1 m Medium Ú1B Ú30V Ú20V Ú10V Ú 5V
c Coarse Ú0.4 Ú1 Ú2 c Coarse Ú1B 30V Ú 1B Ú30V Ú15V Ú10V
v Extremely Coarse v Extremely Coarse 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
More than 100 More than 300 More than 1000
Tolerance Class 100 or Less
300 or Less 1000 or Less 3000 or Less
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
More than 10 More than 30 More than 100 More than 300 More than 1000
Tolerance Class 10 or Less
30 or Less 100 or Less 300 or Less 1000 or Less 3000 or Less
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
More than 100 More than 300
Tolerance Class 100 or Less 300 or Less 1000 or Less More than 1000
Symmetry Tolerance
H 0.5
K 0.6 0.8 1
L 0.6 1 1.5 2

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