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The tables in DIN 7161 (and its successor DIN ISO 286-2) group dimensions into ranges (e.g., above 3mm up to 6mm) and assign specific upper and lower deviations based on the tolerance class: din 7161 pdf
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The primary purpose of DIN 7161 was to define the (allowances) for hole sizes ranging from 1 mm to 500 mm. These values are typically expressed in micrometers ( These values are typically expressed in micrometers (
Legitimate free versions are rare due to copyright. However, the Fraunhofer Institute and some German Landesbibliotheken offer free viewing (not download) of historical standards on-site. Always avoid pirated copies, as they often contain errors that could cause costly manufacturing defects.
This ensures that the tolerance is proportional to the difficulty of manufacturing a specific size.
For modern applications, engineers are encouraged to reference