This nut also known as castle nuts, secure these nuts by inserting a cotter pin or safety wire through the slots and a drilled hole in your bolt for mild loosening resistance. They’re not recommended for use on parts exposed to high vibration because the pin is prone to shearing under prolonged stress. Height includes the slots.
Thread Size D | M6 | (M7) | M8 | M10 | M12 | (M14) | M16 | M18 | M20 | (M22) | |
P | Pitch (Coarse thread) | 1 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 | 2.5 | 2.5 | 2.5 |
Fine thread | - | - | 1 | 1.25 | 1.5 | 1.5 | 1.5 | 2 | 2 | 2 | |
Fine thread | - | - | - | 1 | 1.25 | - | - | 1.5 | 1.5 | 1.5 | |
de | max | - | - | - | - | 16 | 18 | 22 | 25 | 28 | 32 |
min | - | - | - | - | 15.57 | 17.57 | 21.48 | 24.3 | 27.3 | 31 | |
e | min | 11.05 | 12.12 | 14.38 | 17.77 | 20.03 | 23.35 | 26.75 | 29.56 | 32.95 | 37.29 |
k | max=nominal size | 5 | 5.5 | 6.5 | 8 | 10 | 11 | 13 | 15 | 16 | 18 |
min | 4.7 | 5.2 | 6.14 | 7.64 | 9.64 | 10.57 | 12.57 | 14.3 | 15.3 | 17.3 | |
w | max | 2.5 | 3 | 3.5 | 4 | 5 | 6 | 7 | 9 | 10 | 10 |
min | 2.25 | 2.75 | 3.2 | 3.7 | 4.7 | 5.7 | 6.64 | 8.64 | 9.64 | 9.64 | |
n | max | 2.25 | 2.25 | 2.75 | 3.05 | 3.8 | 3.8 | 4.8 | 4.8 | 4.8 | 5.8 |
min | 2 | 2 | 2.5 | 2.8 | 3.5 | 3.5 | 4.5 | 4.5 | 4.5 | 5.5 | |
s | max=nominal size | 10 | 11 | 13 | 16 | 18 | 21 | 24 | 27 | 30 | 34 |
min | 9.78 | 10.73 | 12.73 | 15.73 | 17.73 | 20.67 | 23.67 | 26.16 | 29.16 | 33 | |
Thread Size D | M24 | (M27) | M30 | (M33) | M36 | (M39) | M42 | (M45) | M48 | (M52) | |
P | Pitch (Coarse thread) | 3 | 3 | 3.5 | 3.5 | 4 | 4 | 4.5 | 4.5 | 5 | 5 |
Fine thread | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 3 | 3 | |
Fine thread | - | - | - | - | - | - | - | - | - | - | |
de | max | 34 | 38 | 42 | 46 | 50 | 55 | 58 | 62 | 65 | 70 |
min | 33 | 37 | 41 | 45 | 49 | 53.8 | 56.8 | 60.8 | 63.8 | 68.8 | |
e | min | 39.55 | 45.2 | 50.85 | 55.37 | 60.79 | 66.44 | 71.3 | 76.95 | 82.6 | 88.25 |
k | max=nominal size | 19 | 22 | 24 | 26 | 29 | 31 | 33 | 34.5 | 36 | 38 |
min | 18.16 | 21.16 | 23.16 | 25.16 | 28.16 | 30 | 32 | 33.5 | 35 | 37 | |
w | max | 11 | 14 | 15 | 17 | 20 | 22 | 22 | 22.5 | 24 | 26 |
min | 10.57 | 13.57 | 14.57 | 16.57 | 19.48 | 21.48 | 21.48 | 22.02 | 23.48 | 25.48 | |
n | max | 5.8 | 5.8 | 7.36 | 7.36 | 7.36 | 7.36 | 9.36 | 9.36 | 9.36 | 9.36 |
min | 5.5 | 5.5 | 7 | 7 | 7 | 7 | 9 | 9 | 9 | 9 | |
s | max=nominal size | 36 | 41 | 46 | 50 | 55 | 60 | 65 | 70 | 75 | 80 |
min | 35 | 40 | 45 | 49 | 53.8 | 58.8 | 63.1 | 68.1 | 73.1 | 78.1 |