Tabella Gola Uni Iso 4755 [exclusive]

The official charts with exact micron tolerances are copyrighted by UNI (Ente Italiano di Normazione). They can be purchased via the official UNI Store (store.uni.com). However, for 99% of mechanical applications, the $45^\circ$ chamfer rule with a flat end of roughly 1-2 pitch lengths is the correct interpretation.