Font size options
Increase or decrease the font size for this website by clicking on the 'A's.
Contrast options
Choose a color combination to give the most comfortable
contrast.
All variables outlined inside a DIN 7161 chart are defined in microns (
Are you trying to calculate a specific for an assembly? Share public link
Understanding DIN 7161: ISO Allowances for Internal Dimensions (Holes) din 7161 pdf
Maintaining quality control in precision dicing or boring operations.
: It covers workpieces with a nominal size of up to 500 mm . [1] All variables outlined inside a DIN 7161 chart
Uppercase letters. An "H" hole has a lower deviation of zero, meaning the hole can never be smaller than the nominal size.
(holes) for sizes ranging from 1mm up to 500mm. Before this, if a factory in Munich made a shaft and a factory in Hamburg made a hole, there was no guarantee they would fit together. DIN 7161 provided the mathematical tolerance tables—expressed in micrometers ( )—to ensure perfect compatibility. The Technical Heart [1] Uppercase letters
When looking through a DIN 7161 PDF table, you will frequently see specific pairings of holes and shafts. These pairings create three distinct types of engineering fits: Common Pairing (Hole/Shaft) Description Typical Application H7/g6 or H8/f7
If you are currently troubleshooting a specific manufacturing fit or decoding an old engineering drawing, let me know:
While it has been formally withdrawn and replaced by international standard counterparts like DIN ISO 286-2 , the tables and engineering principles originally detailed within a continue to be heavily referenced in legacy machine design, retrofitting projects, and precision inspection protocols. Key Historical & Technical Specifications Specification Standard Title
But in 1988, the international community struck a deal. The series (parts 1 and 2) was the future—a cleaner, globally harmonized system for general tolerances. Germany had to adapt. Instead of abruptly discarding DIN 7161, the German Institute for Standardization (DIN) issued a Beiblatt (supplement). It said: "DIN 7161 is withdrawn. For new designs, use DIN ISO 2768. However, to avoid legal chaos for existing products, here is a conversion table."