If you are working on a new project, it is highly recommended to transition to ISO 286. The mathematical principles and tolerance zones remain virtually identical, but the nomenclature and international alignment are optimized for modern global manufacturing.
DIN 7161 represents the "extra quality" benchmark for simplifying engineering drawings. By establishing precise general tolerances for linear and angular dimensions without individual indications, it streamlines the design process and ensures manufacturing clarity. While largely superseded internationally by ISO 2768-1, DIN 7161 remains a hallmark of German engineering precision and is a critical document for quality assurance in specific manufacturing contexts.
When looking at a DIN 7161 table or PDF blueprint, you will see alphanumeric codes like or g6 . Understanding these codes is vital.
The shaft's upper deviation is set to zero (indicated by the lowercase letter 'h'). The size of the hole is altered to achieve the fit. 2. Types of Fits Defined by the Standard
: Since DIN 7161 is superseded, most modern engineering projects use the ISO 286-2 Tolerance Chart Public Repositories : A scanned version of the 1965 edition is available on din 7161 pdf extra quality
DIN 7161, officially titled "ISO-Abmaße für Innenmaße (Bohrungen), für Nennmaße von 1 bis 500 mm" (ISO deviations for internal dimensions (holes), for nominal dimensions from 1 to 500 mm), was a foundational standard published in August 1965. Published by the German Institute for Standardisation (Deutsches Institut für Normung), it was a direct application of the early ISO system of limits and fits.
The term "extra quality" in DIN 7161 refers to rollers that exceed the standard's minimum requirements. These rollers are manufactured with tighter tolerances, improved surface finishes, and more stringent inspection procedures, resulting in enhanced performance, reliability, and lifespan.
: Provides the basis of the entire code system for tolerances and fits. How to Access Official Versions
The intersecting cell will display two values, typically written in micrometers ( If you are working on a new project,
If you need help interpreting specific tolerance values, let me know: What is your in millimeters?
Allows engineers to instantly search for specific fit combinations (like "H7/h6") without scrolling through dozens of pages.
For example, a specification of means a nominal diameter of 30 mm, an internal feature (hole), with an IT grade of 7. DIN 7161 provides the exact numerical values (in micrometers or millimeters) for this specific classification. Key Technical Concepts Covered in the Standard
For the updated ISO 286 equivalents.
serving as the current active equivalent for hole tolerances. Typical Tolerance Values (Example)
Provides a very snug fit without noticeable play. Parts can be assembled by hand.
Comprehensive Guide to the DIN 7161 Standard for ISO Metric Holes