DIN ISO 2768 defines standard tolerance ranges used in technical drawings when individual tolerances are not specified.
Engineers, designers, and manufacturers rely on this standard to ensure dimensional consistency across machined parts, fabricated components, and assemblies.
Download our DIN ISO 2768 tolerance reference guide to quickly check permissible deviations for linear dimensions, angular dimensions, flatness, symmetry, and more.
The guide provides a practical engineering reference used across manufacturing, machining, fabrication, and product development.
Download the full DIN ISO 2768 tolerance chart
Understanding DIN ISO 2768 tolerances
DIN ISO 2768 is an international standard used to define general tolerances for dimensions that are not individually specified on engineering drawings.
Instead of applying tolerance values to every dimension, the standard allows engineers to assign a tolerance class. The permitted dimensional variation is then defined by that class.
This approach improves drawing clarity, reduces design time, and ensures manufacturing consistency across components.
The standard is typically applied to:
- machined components
- sheet metal parts
- fabricated assemblies
- precision mechanical parts
- CNC manufactured components
Using DIN ISO 2768 helps ensure that parts manufactured by different suppliers still conform to the same dimensional expectations.
DIN ISO 2768 tolerance classes
The standard defines several tolerance classes that determine the permissible variation on dimensions.
The most commonly used classes include:
Fine tolerance class
Used for precision components where dimensional accuracy is critical.
Medium tolerance class
Commonly applied to general mechanical parts and assemblies.
Coarse tolerance class
Suitable for larger fabricated parts where higher dimensional variation is acceptable.
Very coarse tolerance class
Used for non-critical dimensions in large scale components.
Each tolerance class defines acceptable variation depending on the nominal dimension range of the part.
General tolerances for linear dimensions
DIN ISO 2768 defines permissible deviations depending on the size of the dimension being measured.
For example:
Smaller dimensions allow tighter tolerances, while larger components allow greater variation.
Typical dimensional ranges include:
- 0.5 mm up to 3 mm
- 3 mm up to 6 mm
- 6 mm up to 30 mm
- 30 mm up to 120 mm
- 120 mm up to 400 mm
- 400 mm up to 1000 mm
- 1000 mm up to 2000 mm
Each range corresponds to defined tolerance values depending on the tolerance class applied.
The full chart within the downloadable guide provides the complete tolerance values for each class.
Angular tolerances in DIN ISO 2768
The standard also defines allowable deviations for angular dimensions.
Angular tolerances vary depending on the length of the shorter side of the angle and the tolerance class applied.
Typical angular ranges include:
- up to 10 degrees
- 10 degrees up to 50 degrees
- 50 degrees up to 120 degrees
- 120 degrees up to 400 degrees
- greater than 400 degrees
These limits help ensure correct alignment and orientation of manufactured components during assembly.
Form and position tolerances
In addition to dimensional tolerances, DIN ISO 2768 also specifies general tolerances for geometric characteristics.
These include:
- Straightness
- Flatness
- Perpendicularity
- Symmetry
- Run out
These tolerances ensure that parts maintain the correct geometric relationship between surfaces and features.
The standard defines different tolerance classes depending on the level of precision required.
Download the DIN ISO 2768 tolerance chart
Engineers frequently need to check tolerance limits when reviewing technical drawings or preparing manufacturing specifications.
Our downloadable DIN ISO 2768 reference guide provides:
- full tolerance tables for linear dimensions
- angular tolerance ranges
- form and position tolerance limits
- tolerance class explanations
- a quick reference format suitable for engineering teams
Enter your details to access the full DIN ISO 2768 tolerance chart.
Download the full DIN ISO 2768 tolerance chart
Why engineers use DIN ISO 2768
Applying DIN ISO 2768 tolerances provides several advantages for engineering teams and manufacturers.
- Clear drawing standards
- Reduced design complexity
- Improved supplier consistency
- Faster production workflows
- Reduced risk of dimensional errors
Using recognised international standards also supports better collaboration between design teams, manufacturers, and quality control departments.
About Dau Components
Dau Components supports engineering and manufacturing teams with high quality components and technical expertise.
Our experience working with complex manufacturing requirements means we understand the importance of tolerance control, dimensional accuracy, and technical standards.
If you require support with component supply, manufacturing solutions, or technical guidance, our team is ready to help.
Frequently Asked Questions
What is DIN ISO 2768?
DIN ISO 2768 is an international standard that defines general tolerances for dimensions and geometrical characteristics where specific tolerances are not individually stated on technical drawings.
What does ISO 2768 mk mean?
ISO 2768 mk refers to the combination of tolerance classes used within the standard. The letter m represents the medium tolerance class for dimensions, while k refers to the tolerance class applied to geometrical characteristics.
Why is DIN ISO 2768 used in engineering drawings?
The standard simplifies technical drawings by applying predefined tolerance limits to dimensions without individually specified tolerances. This makes drawings easier to read and improves manufacturing consistency.
Where is DIN ISO 2768 commonly applied?
The standard is widely used in machining, fabrication, product development, and mechanical engineering where consistent dimensional tolerances are required across manufactured components.
Can I download a DIN ISO 2768 tolerance chart?
Yes. The downloadable guide on this page provides a complete reference chart covering dimensional tolerances, angular tolerances, and form tolerances used in DIN ISO 2768.