DIN 439 is a thin hexagonal nut, 0.5 to 0.8 times thinner than the standard hexagonal nut DIN 934. DIN 439 is divided into unchamfered and chamfered types, and the threads are available in metric coarse and left-handed threads. It has a slightly weaker load carrying capacity and is suitable for locking or tight installation spaces.
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DIN 439 Dimensions
Unchamfered
| Thread Size（mm) | M1.6 | M2 | M2.5 | M3 | M3.5 | M4 | M5 | M6 | M8 | M10 |
| P coarse | 0.35 | 0.4 | 0.45 | 0.5 | 0.6 | 0.7 | 0.8 | 1 | 1.25 | 1.5 |
| P fine | / | / | / | / | / | / | / | / | 1 | 1 |
| e max | 3.28 | 4.18 | 5.31 | 5.87 | 6.44 | 7.5 | 8.63 | 10.89 | 14.2 | 18.72 |
| k max | 1 | 1.2 | 1.6 | 1.8 | 2 | 2.2 | 2.7 | 3.2 | 4 | 5 |
| k min | 0.6 | 0.8 | 1.2 | 1.4 | 1.6 | 1.8 | 2.3 | 2.72 | 3.52 | 4.52 |
| s max | 3.2 | 4 | 5 | 5.5 | 6 | 7 | 8 | 10 | 13 | 17 |
| s min | 2.9 | 3.7 | 4.7 | 5.2 | 5.7 | 6.64 | 7.64 | 9.64 | 12.57 | 16.57 |
Chamfered
| mm | M1.6 | M1.8 | M2 | M2.5 | M3 | M3.5 | M4 | M5 | M6 | M8 | M10 | M12 | M14 | M16 | M18 | M20 | M22 | M24 | M27 | M30 | M33 | M36 | M39 | M42 | M45 | M48 | M52 |
| P coarse | 0.35 | 0.35 | 0.4 | 0.45 | 0.5 | 0.6 | 0.7 | 0.8 | 1 | 1.25 | 1.5 | 1.75 | 2 | 2 | 2.5 | 2.5 | 2.5 | 3 | 3 | 3.5 | 3.5 | 4 | 4 | 4.5 | 4.5 | 5 | 5 |
| P fine | / | / | / | / | / | / | / | / | / | 1 | 1 | 1.5 | 1.5 | 1.5 | 1.5 | 2 | 1.5 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 3 | 3 |
| P fine | / | / | / | / | / | / | / | / | / | / | 1.25 | 1.25 | / | / | 2 | 1.5 | 2 | 1.5 | / | / | / | 2 | 2 | 2 | 2 | 2 | 2 |
| P fine | / | / | / | / | / | / | / | / | / | / | / | / | / | / | / | / | / | / | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 |
| e min | 3.48 | 3.82 | 4.32 | 5.45 | 6.01 | 6.58 | 7.66 | 8.79 | 11.05 | 14.38 | 18.9 | 21.1 | 24.49 | 26.75 | 29.56 | 32.95 | 35.03 | 39.55 | 45.2 | 50.85 | 55.37 | 60.79 | 66.44 | 71.3 | 76.95 | 82.6 | 88.25 |
| k max | 1 | 1.1 | 1.2 | 1.6 | 1.8 | 2 | 2.2 | 2.7 | 3.2 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13.5 | 15 | 16.5 | 18 | 19.5 | 21 | 22.5 | 24 | 26 |
| k min | 0.75 | 0.85 | 0.95 | 1.35 | 1.55 | 1.75 | 1.95 | 2.45 | 2.9 | 3.7 | 4.7 | 5.7 | 6.42 | 7.42 | 8.42 | 9.1 | 9.9 | 10.9 | 12.4 | 13.9 | 15.4 | 16.9 | 18.2 | 19.7 | 21.2 | 22.7 | 24.7 |
| s max | 3.2 | 3.5 | 4 | 5 | 5.5 | 6 | 7 | 8 | 10 | 13 | 17 | 19 | 22 | 24 | 27 | 30 | 32 | 36 | 41 | 46 | 50 | 55 | 60 | 65 | 70 | 75 | 80 |
| s min | 3.08 | 3.38 | 3.82 | 4.82 | 5.32 | 5.82 | 6.78 | 7.78 | 9.78 | 12.73 | 16.73 | 18.67 | 21.67 | 23.67 | 26.16 | 29.16 | 31 | 35 | 40 | 45 | 49 | 53.8 | 58.8 | 63.1 | 68.1 | 73.1 | 78.1 |