Metric DIN 6914 high-strength hexagon bolts for steel structures have a high-torque large hexagon head and are mostly 8.8 or 10.9 in strength. It is usually used with DIN 6916 high-strength washers and DIN 6915 high-strength hexagonal nuts to form a complete high-strength bolt connection pair.
Key Features
- Standard number: DIN 6914.
- Head type: High-torque, large hexagon head.
- Strength grades: 8.8 and 10.9.
- Material: Alloy steel, medium carbon steel, heat-treated (quenched and tempered).
- Surface treatment: Blackening, hot-dip galvanizing, Dacromet, etc.
- Thread: Coarse metric thread (compliant with DIN 13).
- Nominal diameters: M12 to M36. Thread length: 40 mm to 240 mm.
- Across-flats: Larger than ordinary hexagonal bolts (e.g. an M20 bolt has 30 mm across flats, while ordinary hexagonal bolts have 30 or 32 mm).
DIN 6914 Dimensions
| mm | P | b max | b min | da max | ds max | ds min | e min | k max | k min | r min | s max | s min |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M12 | 1.75 | 23 | 21 | 15.2 | 12.7 | 11.3 | 23.91 | 8.45 | 7.55 | 1.2 | 22 | 21.16 |
| M16 | 2 | 28 | 26 | 19.2 | 16.7 | 15.3 | 29.56 | 10.75 | 9.25 | 1.2 | 27 | 26.16 |
| M20 | 2.5 | 33 | 31 | 24 | 20.84 | 19.16 | 35.03 | 13.9 | 12.1 | 1.5 | 32 | 31 |
| M22 | 2.5 | 34 | 32 | 26 | 22.84 | 21.16 | 39.55 | 14.9 | 13.1 | 1.5 | 36 | 35 |
| M24 | 3 | 37 | 34 | 28 | 24.84 | 23.16 | 45.2 | 15.9 | 14.1 | 2 | 41 | 40 |
| M27 | 3 | 39 | 37 | 32 | 27.84 | 26.16 | 50.85 | 17.9 | 16.1 | 2 | 46 | 45 |
| M30 | 3.5 | 42 | 40 | 35 | 30.84 | 29.16 | 55.37 | 20.05 | 17.95 | 2 | 50 | 49 |
| M36 | 4 | 50 | 48 | 41 | 37 | 35 | 66.44 | 24.05 | 21.95 | 2 | 60 | 58.8 |