DIN ISO 2768 1 & 2: General Tolerances for Linear and Angular Dimensions

The ISO 2768 standard is intended to simplify drawing indications and specifies tolerances for linear and angular dimensions without individual tolerance indications in four tolerance classes.

ISO 2768-1

Linear Dimensions

Permissible deviations -in mm- for ranges in nominal lengths Tolerance class designation (description)
f m c v
(fine) (medium) (coarse) (very 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

External Radius and Chamfer Heights

Permissible deviations -in mm- for ranges in nominal lengths Tolerance class designation (description)
f m c v
(fine) (medium) (coarse) (very 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 Tolerance class designation (description)
f m c v
(fine) (medium) (coarse) (very coarse)
up to 10 ±1° ±1° ±1°30’ ±3°
over 10, up to 50 ±0°30’ ±0°30’ ±1° ±2°
over 50, up to 120 ±0°20’ ±0°20’ ±0°30’ ±1°
over 120, up to 400 ±0°10’ ±0°10’ ±0°15’ ±0°30’
over 400 ±0°5’ ±0°5’ ±0°10’ ±0°20’

ISO 2768-2

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

Ranges in nominal lengths in mm Tolerance class
H K L
up to 100 0.5 0.6 0.6
over 100, up to 300 0.5 0.6 1
over 300, up to 1000 0.5 0.8 1.5
over 1000, up to 3000 0.5 1 2

Run-Out

Tolerance class
H K L
0.1 0.2 0.5

Common Combinations

ISO2768-fH

Nominal Lengths Linear Dimensions External Radius and Chamfer Heights Angular Dimensions Straightness and Flatness Perpendicularity Symmetry Run-Out
0.5 up to 3 ±0.05 ±0.2 ±1° 0.02 0.2 0.5 0.1
over 3, up to 6 ±0.05 ±0.5 ±0°30’ 0.05 0.2 0.5 0.1
over 6, up to 10 ±0.1 ±1.0 ±0°30’ 0.05 0.2 0.5 0.1
over 10, up to 30 ±0.1 ±1.0 ±0°20’ 0.05 0.2 0.5 0.1
over 30, up to 50 ±0.15 ±1.0 ±0°20’ 0.1 0.2 0.5 0.1
over 50, up to 100 ±0.15 ±1.0 ±0°20’ 0.1 0.2 0.5 0.1
over 100, up to 120 ±0.15 ±1.0 ±0°10’ 0.2 0.3 0.5 0.1
over 120, up to 300 ±0.2 ±1.0 ±0°10’ 0.2 0.3 0.5 0.1
over 300, up to 400 ±0.2 ±1.0 ±0°10’ 0.3 0.4 0.5 0.1
over 400, up to 1000 ±0.3 ±1.0 ±0°5’ 0.3 0.4 0.5 0.1
over 1000, up to 2000 ±0.5 ±1.0 ±0°5’ 0.4 0.5 0.5 0.1
over 2000, up to 3000 - ±1.0 ±0°5’ 0.4 0.5 0.5 0.1
over 3000, up to 4000 - ±1.0 ±0°5’ - - - 0.1

ISO2768-mK

Nominal Lengths Linear Dimensions External Radius and Chamfer Heights Angular Dimensions Straightness and Flatness Perpendicularity Symmetry Run-Out
0.5 up to 3 ±0.1 ±0.2 ±1° 0.05 0.4 0.6 0.2
over 3, up to 6 ±0.1 ±0.5 ±0°30’ 0.05 0.4 0.6 0.2
over 6, up to 10 ±0.2 ±1.0 ±0°30’ 0.1 0.4 0.6 0.2
over 10, up to 30 ±0.2 ±1.0 ±0°20’ 0.1 0.4 0.6 0.2
over 30, up to 50 ±0.3 ±1.0 ±0°20’ 0.2 0.4 0.6 0.2
over 50, up to 100 ±0.3 ±1.0 ±0°20’ 0.2 0.4 0.6 0.2
over 100, up to 120 ±0.3 ±1.0 ±0°10’ 0.4 0.6 0.6 0.2
over 120, up to 300 ±0.5 ±1.0 ±0°10’ 0.4 0.6 0.6 0.2
over 300, up to 400 ±0.5 ±1.0 ±0°10’ 0.6 0.8 0.8 0.2
over 400, up to 1000 ±0.8 ±1.0 ±0°5’ 0.6 0.8 0.8 0.2
over 1000, up to 2000 ±1.2 ±1.0 ±0°5’ 0.8 0.8 1.0 0.2
over 2000, up to 3000 ±2.0 ±1.0 ±0°5’ 0.8 0.8 1.0 0.2
over 3000, up to 4000 ±2.0 ±1.0 ±0°5’ - - - 0.2