ISO 4161
ISO 4161 , Hex Flange Nuts standard.
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Hex Flange Nuts, ISO 4161 dimension as below:
| Size | c min. | dc max. | dw min. | e min. | m max. | m min. | s max. | s min. |
| M5 | 1 | 11.8 | 9.8 | 8.79 | 5 | 4.7 | 8 | 7.78 |
| M6 | 1.1 | 14.2 | 12.2 | 11.05 | 6 | 5.7 | 10 | 9.78 |
| M8 | 1.2 | 17.9 | 15.8 | 14.38 | 8 | 7.6 | 13 | 12.73 |
| M10 | 1.5 | 21.8 | 19.6 | 16.64 | 10 | 9.6 | 15 | 14.73 |
| M12 | 1.8 | 26 | 23.8 | 20.03 | 12 | 11.6 | 18 | 17.73 |
| M14 | 2.1 | 29.9 | 27.6 | 23.36 | 14 | 13.3 | 21 | 20.67 |
| M16 | 2.4 | 34.5 | 31.9 | 26.75 | 16 | 15.3 | 24 | 23.67 |
| M20 | 3 | 42.8 | 39.9 | 32.95 | 20 | 18.9 | 30 | 29.67 |