Permissible deviations in mm for ranges in nominal lengths
f (fine)
Tolerance class designation (description)
v (very coarse)
m (medium)
c (coarse)
0.5 up to 3
±0.05
±0.1
±0.2
–
over 3 up to 6
±0.05
±0.1
±0.3
±0.5
over 6 up to 30
±0.1
±0.2
±0.5
±1.0
over 30 up to 120
±0.15
±0.3
±0.8
±1.5
over 120 up to 400
±0.2
±0.5
±1.2
±2.5
over 400 up to 1000
±0.3
±0.8
±2.0
±4.0
over 1000 up to 2000
±0.5
±1.2
±3.0
±6.0
over 2000 up to 4000
–
±2.0
±4.0
±8.0
General tolerance ISO 2768 does not specify where to use these tolerances. Tolerance class is defined as per design requirements and manufacturing capability. For example : for sheet metal parts ISO 2768–mk is used. And for machined components ISO 2768–fh can be used.
Linear Dimensions
External Radius and Chamfer Heights
Permissible deviations in mm for ranges in nominal lengths
f (fine)
Tolerance class designation (description)
v (very coarse)
m (middle)
c (coarse)
0.5 up to 3
±0.2
±0.2
±0.4
±0.4
over 3 up to 6
±0.5
±0.5
±1.0
±1.0
over 6
±1.0
±1.0
±2.0
±2.0
Angular Dimensions
Permissible deviations in degrees and minutes for ranges in nominal lengths
f (fine)
Tolerance class designation (description)
v (very coarse)
m (middle)
c (coarse)
up to 10
±1º
±1º
±1º30′
±3º
over 10 up to 50
±0º30′
±0º30′
±1º
±2º
over 50 up to 120
±0º20′
±0º20′
±0º30′
±1º
over 120 up to 400
±0º10′
±0º10′
±0º15′
±0º30′
over 400
±0º5′
±0º5′
±0º10′
±0º20′
Straightness and Flatness
Ranges in nominal lengths in mm
Tolerance class
H
K
L
up to 10
0.02
0.05
0.1
over 10 up to 30
0.05
0.1
0.2
over 30 up to 100
0.1
0.2
0.4
over 100 up to 300
0.2
0.4
0.8
over 300 up to 1000
0.3
0.6
1.2
over 1000 up to 3000
0.4
0.8
1.6
Perpendicularity
Ranges in nominal lengths in mm
Tolerance class
H
K
L
up to 100
0.2
0.4
0.6
over 100 up to 300
0.3
0.6
1
over 300 up to 1000
0.4
0.8
1.5
over 1000 up to 3000
0.5
0.8
2
Symmetry (Position for ISO G&T Standard not-ASME or ANSI GD&T)