Bolt Specification & Capacity Reference
Structural bolts are a critical component in steel connections. This reference covers dimensions, grades, and shear and tension capacities aligned with BS EN 14399 (preloaded bolts) and BS EN 15048 (non-preloaded bolts).
Bolt Dimensions (M12–M36)
| Bolt Size | Shank Diameter (mm) | Hole Size (mm) | Head Diameter (mm) | Head Height (mm) | Tensile Stress Area (mm²) |
|---|
Bolt Grades & Material Properties
| Grade | Material | Yield Strength (MPa) | Tensile Strength (MPa) | Common Applications |
|---|---|---|---|---|
| 4.6 | Carbon steel | 240 | 400 | General purpose, non-critical connections |
| 8.8 | Carbon steel | 640 | 800 | General structural work, most connections |
| 10.9 | Carbon steel, hardened & tempered | 900 | 1000 | High-strength connections, preloaded |
Single Shear Capacity (kN) — Non-preloaded
| Bolt Size | Grade 4.6 | Grade 8.8 | Grade 10.9 |
|---|
Double Shear Capacity (kN) — Non-preloaded
| Bolt Size | Grade 4.6 | Grade 8.8 | Grade 10.9 |
|---|
Tension Capacity (kN) — Non-preloaded
| Bolt Size | Grade 4.6 | Grade 8.8 | Grade 10.9 |
|---|
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