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Product Overview
Metric Grade 12.9 threaded rods are high-strength carbon alloy steel fasteners manufactured to ISO 898-1 and EN 14399 standards. These rods are fully threaded along their length and are engineered for critical bolted joints requiring exceptional tensile and yield strength. Grade 12.9 designates a minimum tensile strength of 1220 MPa and a minimum yield strength of 1100 MPa, making them ideal for demanding structural, mechanical, and heavy machinery applications.
Metric Grade 12.9 threaded rods are commonly supplied in black oxide, zinc-plated, or phosphate finishes for corrosion resistance. They are widely specified for bolted connections in steel structures, wind turbines, heavy equipment, and precision machinery where maximum preload and minimal elongation are essential.
| Material | Alloy Steel (Grade 12.9) |
| Standard | ISO 898-1 / EN 14399 |
| Thread Form | ISO Metric (Coarse & Fine) |
| Diameter Range | M6-M100 |
| Length Range | 100 mm - 3000 mm |
| Tensile Strength | 1220 MPa min |
| Yield Strength | 1100 MPa min |
| Hardness | 39-44 HRC |
| Finish | Black oxide, Zinc plated, Phosphate |
| Certification | EN 10204 3.1 / 3.2 |
Complete the Fastener Set
Technical Data
| Size (M) | Pitch (mm) | Core Dia (mm) | Max Length (mm) |
|---|---|---|---|
| M6 | 1.0 | 4.773 | 1000 |
| M8 | 1.25 | 6.466 | 2000 |
| M10 | 1.5 | 8.159 | 2000 |
| M12 | 1.75 | 9.853 | 2000 |
| M16 | 2.0 | 13.546 | 3000 |
| M20 | 2.5 | 17.188 | 3000 |
| M24 | 3.0 | 20.863 | 3000 |
| M30 | 3.5 | 26.897 | 3000 |
| M36 | 4.0 | 32.930 | 3000 |
| M42 | 4.5 | 38.964 | 3000 |
| M48 | 5.0 | 45.000 | 3000 |
| M56 | 5.5 | 53.000 | 3000 |
| M64 | 6.0 | 61.000 | 3000 |
| M72 | 6.0 | 69.000 | 3000 |
| M80 | 6.0 | 77.000 | 3000 |
| M100 | 6.0 | 97.000 | 3000 |
| Standard | Covers | Thread |
|---|---|---|
| DIN 976-1 | Threaded rods, full thread | Metric |
| ISO 898-1 | Mechanical properties | Metric |
| EN 14399-4 | Structural bolting assemblies | Metric |
| ASME B18.31.3 | Threaded rods (inch) | UNC/UNF |
| Material Standard | Requirement |
|---|---|
| ISO 898-1 | Grade 12.9 mechanical |
| EN 10204 3.1 | Mill test certificate |
| EN 10204 3.2 | TPI-witnessed MTC |
| ISO 4042 | Coating/finish |
Material Chemistry
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.30-0.50 |
| Manganese (Mn) | 0.50-1.30 |
| Phosphorus (P) | 0.035 max |
| Sulfur (S) | 0.035 max |
| Silicon (Si) | 0.15-0.35 |
| Chromium (Cr) | 0.30 max |
| Nickel (Ni) | 0.30 max |
| Molybdenum (Mo) | 0.20 max |
| Boron (B) | 0.003-0.005 |
Fastener Performance
| Rod Size | Dry (Nm) | Lubricated (Nm) | Clamp Load (kN) |
|---|---|---|---|
| M12 | 120 | 96 | 70 |
| M16 | 295 | 236 | 144 |
| M20 | 580 | 464 | 225 |
| M24 | 1000 | 800 | 325 |
| M30 | 2000 | 1600 | 470 |
| M36 | 3500 | 2800 | 680 |
| M42 | 5200 | 4160 | 950 |
| M48 | 7500 | 6000 | 1300 |
Industry Applications
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