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DIN EN 1661 FLANGE NUTS
Hex Flange Lock Nut
FLANGE NUTS. Flange nuts are hex nuts with a bottom circular flange that is larger than their top hex section. There are two types commonly available: flange lock nuts, which are prevailing torque type lock nuts, and serrated flange nuts, which are free spinning but have a serrated bearing surface to grip the mating surface.
Specification
DIN 6923 - Hexagon nuts with flange
Current norm: DIN EN 19661
Equivalent norms: ISO 4161; EU 1661;
Legend:
s - size of the hexagon
e - the diameter of the circumscribed circle (not less than)
m - height of the nut
d - the nominal diameter of the thread
dc - outer diameter of the ring
dw - contact surface diameter
r - radius
Steel:6, 8, 10
Stainless: A2 A4
Plastic: -
Non Ferrous: -
Thread: 6G
Notes:
dimensions in mm
| Thread size d | M5 | M6 | M8 | M10 | M12 | M14 | M16 | M20 | |
| - | - | M8x1 | M10x1,25 | M12x1,5 | M14x1,5 | M16x1,5 | M20x1,5 | ||
| - | - | - | (M10x1) | (M12x1,5) | - | - | - | ||
| P | 0,8 | 1 | 1,25 | 1,5 | 1,75 | 2 | 2 | 2,5 | |
| c | min. | 1 | 1,1 | 1,2 | 1,5 | 1,8 | 2,1 | 2,4 | 3 |
| da | min. | 5 | 6 | 8 | 10 | 12 | 14 | 16 | 20 |
| max. | 5,75 | 6,75 | 8,75 | 10,8 | 13 | 15,1 | 17,3 | 21,6 | |
| dc | max. | 11,8 | 14,2 | 17,9 | 21,8 | 26 | 29,9 | 34,5 | 42,8 |
| dw | min. | 9,8 | 12,2 | 15,8 | 19,6 | 23,8 | 27,6 | 31,9 | 39,9 |
| e | min. | 8,79 | 11,05 | 14,38 | 16,64 | 20,03 | 23,36 | 26,75 | 32,95 |
| m | max. | 5 | 6 | 8 | 10 | 12 | 14 | 16 | 20 |
| min. | 4,7 | 5,7 | 7,6 | 9,6 | 11,6 | 13,3 | 15,3 | 18,9 | |
| m´ | min. | 2,2 | 3,1 | 4,5 | 5,5 | 6,7 | 7,8 | 9 | 11,1 |
| s | nominal=max. | 8 | 10 | 13 | 15 | 18 | 21 | 24 | 30 |
| min. | 7,78 | 9,78 | 12,73 | 14,73 | 17,73 | 20,67 | 23,67 | 29,67 | |
| r | max. | 0,3 | 0,36 | 0,48 | 0,6 | 0,72 | 0,88 | 0,96 | 1,2 |
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