Strictly adhering to ISO 2768 standards,
ensuring perfect fit for every part
What is ISO 2768?
ISO 2768 is an international standard that defines general tolerances for linear dimensions, angular dimensions, and geometrical features without specific tolerance indications. It ensures consistency and quality in manufacturing parts and assemblies.
ISO 2768-1
Tolerances for linear and angular dimensions.
Grades:
f (fine): Fine tolerances for high precision.
m (medium): Medium tolerances for general precision.
c (coarse): Coarse tolerances for lower precision.
v (very coarse): Very coarse tolerances for very low precision.
ISO 2768-2
Geometrical tolerances (flatness, straightness, perpendicularity, etc.).
Grades:
H (high precision): High precision for features with stringent requirements.
K (medium precision): Medium precision for general requirements.
L (low precision): Low precision for less stringent requirements.
Linear Dimensions
| Permissible deviations in mm for ranges in nominal lengths | Tolerance class designation (description) | |||
| f (fine) | m (medium) | c (coarse) | v (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 1000 up to 2000 | - | ±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 (fine) | m (medium) | c (coarse) | v (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 (fine) | m (medium) | c (coarse) | v (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°05' | ±0°05' | ±0°10' | ±0°20' |
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)
| 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 |
Circular Runout
| Ranges of nominal lengths in mm | Tolerance Class | ||
| H | K | L | |
| 0.1 | 0.2 | 0.5 | |
