ISO 4161 - 2012 Hexagon Nuts With Flange, Style 2-Coarse Thread
Equivalent norm: GB/T 6177.1, DIN EN 1661, ANSI/ASME B18.2.4.4M, DIN EN 1661, NF E 25-406
| Legend | Making |
| P=pitch | Carbon Steel:8,10 |
| K=height of the nut | Thread:6G |
| D=the nominal diameter of the thread | Surface:BLK,ZP,HDG,etc |
| E=The length of the diagonal | |
| S=The length of the flat |