The following chart illustrates the development of this standard family, from the historical DIN 7161 to the modern ISO standards used today:
If you need to access the official document, you can find the DIN 7161 - 1965-08 standard on the DIN Media website . What is DIN 7161?
Rows are categorized by letters representing the deviation position (e.g., is the standard hole, with lower deviation Deviations (
The maximum allowable limit from nominal. din 7161 pdf
Without the standardizations found in DIN 7161, global manufacturing would collapse. A part made in Germany wouldn't fit a machine in the US. This document is the "diplomat" of the industrial world, ensuring that when two pieces of metal meet, they speak the same mathematical language.
In the world of manufacturing and mechanical engineering, precision is king. The interchangeability of parts, the ability to assemble components without rework, and the overall quality of a final product all depend on strict adherence to dimensional specifications. This principle is governed by the system of Limits and Fits. Before the widespread adoption of unified international standards, individual nations maintained their own comprehensive systems. For German industry, a key part of this historical framework was the standard , titled "ISO Allowances for Internal Dimensions (Holes) for Nominal Dimensions from 1 to 500 mm".
What or tolerance class (e.g., H7) you are targeting. The following chart illustrates the development of this
Even though DIN 7161 was superseded by DIN ISO 286-2 in 1990, it remains highly relevant for:
Do you need assistance finding a to download or purchase the current ISO equivalent standard?
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. Without the standardizations found in DIN 7161, global
DIN 7161 categorizes the relationship between mating components into three distinct types of fits: Clearance Fit
Tables of standard tolerance grades and limit deviations for holes and shafts.