While many people rush to the complex charts of ISO 286, there is one specific standard that solves a very common problem: That standard is DIN 7161 .
If you are designing new parts for global export, use ISO 286. If you are maintaining, repairing, or interpreting old European blueprints— Where to Find a Reliable DIN 7161 PDF Be careful. Many free PDFs online are scanned copies from the 1970s with low resolution. din 7161 pdf
In plain English: It tells you exactly how much smaller a shaft should be compared to a hole so that they fit together easily without force, but also without excessive wobble. While many people rush to the complex charts
