Dimensional Standard of Nut As Per Dast 021
β = 15° to 30°
θ = 90° to 120°
| Size. | Pitch (p) | Width across corner (e) | Width across Flat (s) | Thickness (m) | da | dw | Minor diameter (Bore) (d) | ||||
| MM | Min. | Min. | Max. | Min. | Max. | Min | Max. | Min. | Min. | Max. | |
| M12 | 1.75 | 23.91 | 21.16 | 22.00 | 9.64 | 10.00 | 12.00 | 13.00 | 20.10 | 10.20 | 10.30 |
| M16 | 2.00 | 29.56 | 26.16 | 27.00 | 12.30 | 13.00 | 16.00 | 17.30 | 24.90 | 12.10 | 12.20 |
| M20 | 2.50 | 35.03 | 31.00 | 32.00 | 14.90 | 16.00 | 20.00 | 21.60 | 29.50 | 17.60 | 17.70 |
| M-22 | 2.50 | 39.55 | 35.00 | 36.00 | 16.90 | 18.22 | 22.00 | 23.70 | 33.30 | 19.60 | 19.70 |
| M-24 | 3.00 | 45.20 | 40.00 | 41.00 | 18.70 | 21.00 | 24.00 | 25.90 | 38.00 | 20.70 | 20.80 |
| M-27 | 3.00 | 50.85 | 45.00 | 46.00 | 20.70 | 22.00 | 27.00 | 29.10 | 42.80 | 23.80 | 23.90 |
| M-30 | 3.50 | 55.37 | 49.00 | 50.00 | 22.70 | 24.00 | 30.00 | 32.40 | 46.60 | 26.50 | 26.60 |
| M-36 | 4.00 | 66.44 | 58.80 | 60.00 | 27.70 | 29.00 | 36.00 | 38.90 | 55.90 | 32.10 | 32.20 |
| M-42 | 4.50 | 76.95 | 68.10 | 70.00 | 32.40 | 34.00 | 36.00 | 38.90 | 64.70 | 37.70 | 37.80 |
| M-45 | 4.50 | 82.60 | 73.10 | 75.00 | 34.40 | 36.00 | 39.00 | 42.10 | 69.50 | 40.90 | 41.00 |
| M-48 | 5.00 | 88.25 | 78.10 | 80.00 | 36.40 | 38.00 | 42.00 | 45.40 | 74.20 | 43.10 | 43.20 |
| M-56 | 5.50 | 99.20 | 87.80 | 90.00 | 43.40 | 45.00 | 45.00 | 48.60 | 83.40 | 50.80 | 50.90 |
| M-64 | 6.00 | 110.50 | 97.80 | 100.00 | 49.10 | 51.00 | 48.00 | 51.80 | 92.90 | 57.80 | 57.90 |