DIN EN ISO 8676 Hexagon Head Bolts with Fine Pitch Thread – Product Grades A and B (2011); specifies the requirements for fully threaded hexagon head bolts with metric fine pitch threads. These bolts are used in applications where a tighter thread engagement, improved resistance to vibration loosening, and precise adjustment are required.
Dimensions of DIN EN ISO 8676 Hexagon Head Bolts with Fine Pitch Thread
| Screw Thread (d) | M8 | M10 | M10 | M12 | M12 | M14 | M16 | M18 | M20 | M20 | M22 | M24 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| P (Pitch) | 1 | 1 | 1.25 | 1.5 | 1.25 | 1.5 | 1.5 | 1.5 | 1.5 | 2 | 1.5 | 2 | |
| a | max | 3 | 3 | 4 | 4.5 | 4 | 4.5 | 4.5 | 4.5 | 4.5 | 6 | 4.5 | 6 |
| min | 1 | 1 | 1.25 | 1.5 | 1.25 | 1.5 | 1.5 | 1.5 | 1.5 | 2 | 1.5 | 2 | |
| c | max | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 |
| min | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | |
| da | max | 9.2 | 11.2 | 11.2 | 13.7 | 13.7 | 15.7 | 17.7 | 20.2 | 22.4 | 22.4 | 24.4 | 26.4 |
| dw | Grade A min | 11.63 | 14.63 | 14.63 | 16.63 | 16.63 | 19.64 | 22.49 | 25.34 | 28.19 | 28.19 | 31.71 | 33.61 |
| Grade B min | 11.47 | 14.47 | 14.47 | 16.47 | 16.47 | 19.15 | 22 | 24.85 | 27.7 | 27.7 | 31.35 | 33.25 | |
| e | Grade A min | 14.38 | 17.77 | 17.77 | 20.03 | 20.03 | 23.36 | 26.75 | 30.14 | 33.53 | 33.53 | 37.72 | 39.98 |
| Grade B min | 14.2 | 17.59 | 17.59 | 19.85 | 19.85 | 22.78 | 26.17 | 29.56 | 32.95 | 32.95 | 37.29 | 39.55 | k | Nominal Size | 5.3 | 6.4 | 6.4 | 7.5 | 7.5 | 8.8 | 10 | 11.5 | 12.5 | 12.5 | 14 | 15 |
| Grade A (max) | 5.45 | 6.58 | 6.58 | 7.68 | 7.68 | 8.98 | 10.18 | 11.715 | 12.715 | 12.715 | 14.215 | 15.215 | Grade A (min) | 5.15 | 6.22 | 6.22 | 7.32 | 7.32 | 8.62 | 9.82 | 11.285 | 12.285 | 12.285 | 13.785 | 14.785 |
| Grade B (max) | 5.54 | 6.69 | 6.69 | 7.79 | 7.79 | 9.09 | 10.29 | 11.85 | 12.85 | 12.85 | 14.35 | 15.35 | |
| Grade B (min) | 5.06 | 6.11 | 6.11 | 7.21 | 7.21 | 8.51 | 9.71 | 11.15 | 12.15 | 12.15 | 13.65 | 14.65 | |
| k1 | Grade A min | 3.61 | 4.35 | 4.35 | 5.12 | 5.12 | 6.03 | 6.87 | 7.9 | 8.6 | 8.6 | 9.65 | 10.35 |
| Grade B min | 3.54 | 4.28 | 4.28 | 5.05 | 5.05 | 5.96 | 6.8 | 7.81 | 8.51 | 8.51 | 9.56 | 10.26 | |
| r (min) | 0.4 | 0.4 | 0.4 | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 | 0.8 | 0.8 | 0.8 | 0.8 | |
| S | max=nominal size | 13 | 16 | 16 | 18 | 18 | 21 | 24 | 27 | 30 | 30 | 34 | 36 |
| Grade A (min) | 12.73 | 15.73 | 15.73 | 17.73 | 17.73 | 20.67 | 23.67 | 26.67 | 29.67 | 29.67 | 33.38 | 35.38 | |
| Grade B (min) | 12.57 | 15.57 | 15.57 | 17.57 | 17.57 | 20.16 | 23.16 | 26.16 | 29.16 | 29.16 | 33 | 35 | |
Technical Data provided by Fastener Planet
| Screw Thread (d) | M27 | M30 | M33 | M36 | M39 | M42 | M45 | M48 | M52 | M56 | M60 | M64 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| P (Pitch) | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 4 | |
| a | max | 6 | 6 | 6 | 9 | 9 | 9 | 9 | 9 | 12 | 12 | 12 | 12 |
| min | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 3 | 4 | 4 | 4 | 4 | |
| c | max | 0.8 | 0.8 | 0.8 | 0.8 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| min | 0.2 | 0.2 | 0.2 | 0.2 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | 0.3 | |
| da | max | 30.4 | 33.4 | 36.4 | 39.4 | 42.4 | 45.6 | 48.6 | 52.6 | 56.6 | 63 | 67 | 71 |
| dw | Grade A min | – | – | – | – | – | – | – | – | – | – | – | – |
| Grade B min | 38 | 42.75 | 46.55 | 51.11 | 55.86 | 59.95 | 64.7 | 69.45 | 74.2 | 78.66 | 83.41 | 88.16 | |
| e | Grade A min | – | – | – | – | – | – | – | – | – | – | – | – |
| Grade B min | 45.2 | 50.85 | 55.37 | 60.79 | 66.44 | 71.3 | 76.95 | 82.6 | 88.25 | 93.56 | 99.21 | 104.86 | k | Nominal Size | 17 | 18.7 | 21 | 22.5 | 25 | 26 | 28 | 30 | 33 | 35 | 38 | 40 |
| Grade A (max) | – | – | – | – | – | – | – | – | – | – | – | – | Grade A (min) | – | – | – | – | – | – | – | – | – | – | – | – |
| Grade B (max) | 17.35 | 19.12 | 21.42 | 22.92 | 25.42 | 26.42 | 28.42 | 30.42 | 33.5 | 35.5 | 38.5 | 40.5 | |
| Grade B (min) | 16.65 | 18.28 | 20.58 | 22.08 | 24.58 | 25.58 | 27.58 | 29.58 | 32.5 | 34.5 | 37.5 | 39.5 | |
| k1 | Grade A min | – | – | – | – | – | – | – | – | – | – | – | – |
| Grade B min | 11.66 | 12.8 | 14.41 | 15.46 | 17.21 | 17.91 | 19.31 | 20.71 | 22.75 | 24.15 | 26.25 | 27.65 | |
| r (min) | 1 | 1 | 1 | 1 | 1 | 1.2 | 1.2 | 1.6 | 1.6 | 2 | 2 | 2 | S | max=nominal size | 41 | 46 | 50 | 55 | 60 | 65 | 70 | 75 | 80 | 85 | 90 | 95 |
| Grade A (min) | – | – | – | – | – | – | – | – | – | – | – | – | |
| Grade B (min) | 40 | 45 | 49 | 53.8 | 58.8 | 63.1 | 68.1 | 73.1 | 78.1 | 82.8 | 87.8 | 92.8 | |
Technical Data provided by Fastener Planet