*BS3692 Lock Nuts
| Across Flat | Overall Thickness |
Countersink Diameter |
Across Corner | |||||
|---|---|---|---|---|---|---|---|---|
| d | s | h | da | e | ||||
| max | min | max | min | max | min | max | min | |
| M8 | 13.00 | 12.73 | 5.0 | 4.70 | 8.75 | 8.00 | 15.00 | 14.38 |
| M10 | 17.00 | 16.73 | 6.0 | 5.70 | 10.80 | 10.00 | 19.60 | 18.90 |
| M12 | 19.00 | 18.67 | 7.0 | 6.64 | 12.96 | 12.00 | 21.60 | 21.10 |
| (M14) | 22.00 | 21.67 | 8.0 | 7.64 | 15.12 | 14.00 | 25.40 | 24.49 |
| M16 | 24.00 | 23.67 | 8.0 | 7.64 | 17.28 | 16.00 | 27.70 | 26.75 |
| (M18) | 27.00 | 26.69 | 9.0 | 8.64 | 19.44 | 18.00 | 31.20 | 30.14 |
| M20 | 30.00 | 29.67 | 9.0 | 8.64 | 21.60 | 20.00 | 34.60 | 33.53 |
| (M22) | 32.00 | 31.61 | 10.0 | 9.64 | 23.76 | 22.00 | 36.90 | 35.72 |
| M24 | 36.00 | 35.38 | 10.0 | 9.64 | 25.92 | 24.00 | 41.60 | 39.98 |
| (M27) | 41.00 | 40.38 | 12.0 | 11.57 | 29.16 | 27.00 | 47.30 | 45.63 |
| M30 | 46.00 | 45.38 | 12.0 | 11.57 | 32.40 | 30.00 | 53.10 | 51.28 |
| (M33) | 50.00 | 49.38 | 14.0 | 13.57 | 35.64 | 33.00 | 57.70 | 55.80 |
| M36 | 55.00 | 54.26 | 14.0 | 13.57 | 38.88 | 36.00 | 63.50 | 61.31 |
| (M39) | 60.00 | 59.26 | 16.0 | 15.57 | 42.12 | 39.00 | 69.30 | 66.96 |
| M42 | 65.00 | 64.26 | 16.0 | 15.57 | 45.36 | 42.00 | 75.10 | 72.61 |
| (M45) | 70.00 | 69.26 | 18.0 | 17.57 | 48.60 | 45.00 | 80.80 | 78.26 |
| M48 | 75.00 | 74.26 | 18.0 | 17.57 | 51.84 | 48.00 | 86.60 | 83.91 |
| (M52) | 80.00 | 79.26 | 20.0 | 19.48 | 56.16 | 52.00 | 92.40 | 89.56 |
Sizes in brackets are non preferred sizes and should be avoided if possible.