The parts might have a slight clearance or a slight interference, used for accurate location where a light push is needed. Interference Fit (Press Fit):
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DIN 7161 is currently and considered obsolete for new designs. It has been replaced by the more comprehensive international standard DIN ISO 286-2 .
Yes. Millions of legacy technical drawings across aerospace, automotive, and heavy machinery industries still reference DIN 7161 tolerances. When restoring classic machinery or manufacturing replacement parts, referencing the original DIN 7161 tables is often necessary to ensure historical accuracy. Core Concepts Explained: Holes, Shafts, and Fits
The technical tables present precise minimum and maximum deviation thresholds across localized size brackets: Up to 3 mm Above 3 mm to 6 mm Above 6 mm to 10 mm Above 10 mm to 18 mm Continuous stepped ranges scaling up to 500 mm 3. Deviation Values in Microns (
A very specific request!
Used for rough manufacturing processes like casting, stamping, or forging.
ISO 286-1:2010(en), Geometrical product specifications (GPS)
The German Institute for Standardization (DIN) created it. It complements the broader ISO system of limits and fits.
DIN 7161 is a German standard that specifies tolerances for linear and angular dimensions of metallic materials. The standard is published by the Deutsches Institut für Normung (DIN), which is the German national body responsible for developing and publishing technical standards.
The position of the tolerance zone relative to the nominal zero line is designated by a letter:
The exact for a specific size (e.g., 20mm H7/g6)
| Feature | DIN 7161 (Old German Standard) | ISO 286 (Current International Standard) | | :--- | :--- | :--- | | | Principles & definitions for cylindrical workpieces | Comprehensive system of limits and fits for holes and shafts | | Status | Withdrawn (superseded) | Active | | Key Concepts | Defines tolerance grade and fundamental deviation conceptually | Defines specific IT grades (IT01 to IT18) | | Usage | Legacy drawings, education, historical repair | New designs, global manufacturing |
While older, the tolerances defined in DIN 7161 are still referenced in many legacy designs and engineering documentation from the mid-to-late 20th century.
The "Medium (m)" class is the most commonly used for general machining operations.
To resolve trade barriers and unify limits across borders, the system was fully absorbed into the international standards framework. Today, any modern facility working on a fresh design should utilize . This modern evolution retains the exact underlying mathematical structure of the original metric system but introduces refined size ranges, expanded tolerance classes, and harmonized definitions suited for modern CNC manufacturing platforms. Where to Find and Download the Document