The difference between the maximum limit of size and the nominal size.

Precise locating pins, pulleys, and components that need accurate alignment but must be disassembled occasionally. Common ISO designations: H7/k6 or H7/n6. The Two Fit Systems: Hole-Basis vs. Shaft-Basis

All values are provided in millimeters (mm), with tolerances often measured in microns ( Key Technical Components of DIN 7161

You might also find the PDF on third-party websites.

Common for general engineering, shafts, holes, and rolling bearings.

Understanding DIN 7161: The Foundation of ISO Metric Tolerances and Fits

: Many shops still use the original DIN 7161 charts as quick-reference "cheat sheets" on the shop floor. Würth Industry Vietnam How to Access Official Versions

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All deviations are typically expressed in micrometers ( ) . How to Access the PDF

The shaft is always smaller than the hole, allowing for free movement (e.g., a rotating axle). Transition Fit:

DIN 7161 acts as a bridge between the designer’s dream and the machinist’s reality. While a designer might imagine a perfect 50mm shaft, the machinist knows perfection is impossible. DIN 7161 provides the "Tolerance Tables"—a set of rules that define exactly how much "imperfection" is allowed for the machine to still function perfectly. The Mechanics of the Story