: Read the values, which are usually in micrometres (+18 / 0). Add or subtract these from your nominal size to find your maximum and minimum manufacturing limits. Tell me if you need:
The standard divides dimensions into progressive steps to account for manufacturing capabilities: 6 to 10 mm 10 to 18 mm ... up to 500 mm. 2. Fundamental Deviations (Letters A to Z)
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 (
He explained that in the 1970s and 80s, West German industry had a problem. They had two parallel universes of general tolerances: the older, highly detailed for linear dimensions (like lengths, steps, chamfers) and DIN 7162 for angles and radii. These were practical, house-made standards. din 7161 pdf
If you are a student or work for an engineering firm, check your organization's internal library. Most have enterprise subscriptions to databases like IEEE, DIN, or ISO.
In the quiet, dust-moted corner of a German machine shop in 1965, a young apprentice named Elias held a blueprint that seemed to defy the laws of physics. It called for a 50mm bore, but the machinist, a veteran named Hans, just grunted and tapped a worn, grey booklet:
Yes, a withdrawn "historical" standard can still be used under specific conditions. According to official guidance from DIN Media, . However, it is generally recommended to use the most current standard (DIN EN ISO 286-2) to ensure compliance with best practices and international technical specifications. : Read the values, which are usually in
Repairing older industrial equipment built to German standards.
Unlike its sibling document DIN 7160 (which regulates deviations for shafts and external components), . This relies on uppercase fundamental tolerance symbols (e.g., H5, H6, H7, H11) to define the boundary limits of a bore. 2. Size Groupings (in mm)
DIN 7161, which provided ISO tolerance deviations for dimensions from 1 to 500 mm, is a historical German technical standard that has largely been succeeded by modern ISO 286 standards. It remains relevant for interpreting legacy blueprints and understanding fundamental mechanical fit principles in engineering. For official documentation and modern equivalent data, refer to ISO 286 standards or official standards bodies. up to 500 mm
: Find the row corresponding to your part's basic diameter (e.g., over 10mm up to 18mm).
: Global defense, aerospace, and heavy industrial assets built between 1965 and 1990 depend entirely on engineering prints that cite DIN 7161 directly. Repair teams must reference the exact historical standards to avoid assembly errors during component replacement.