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| Property | Value |
|---|---|
| Standard | ISO 898-1 / DIN 267 |
| Tensile Strength | 1040 MPa min |
| Yield Strength | 940 MPa min (0.9 ratio) |
| Hardness | 32–39 HRC |
| Core Material | Medium carbon alloy steel (e.g., 35B2, 40Cr) |
| Max Service Temperature | 300°C |
| Element | Composition (%) |
|---|---|
| C | 0.20–0.55 |
| Mn | 0.60–1.40 |
| Cr+Mo | as required |
| P | ≤0.035 |
| S | ≤0.035 |
| B | trace if boron steel |
Metric Grade 10.9 fasteners are manufactured from medium carbon boron or alloy steels such as 35B2 or 40Cr, with carbon content typically between 0.28% and 0.55%. Boron and manganese improve hardenability, allowing consistent through-hardening during quenching and tempering. Chromium and molybdenum, when present, enhance strength and wear resistance, while controlled sulfur and phosphorus levels ensure toughness and minimize brittleness. These alloying additions collectively enable the fastener to achieve its high tensile and yield strength ratings after heat treatment.
The resulting quenched and tempered microstructure provides an excellent balance of strength, ductility and fatigue resistance, making Grade 10.9 fasteners ideal for high-load structural, automotive and machinery applications. Zinc, phosphate or other surface coatings can be applied to improve corrosion resistance in outdoor or industrial environments. Their high clamping force capability, dimensional stability under thermal cycling and reliable performance under dynamic loading make them a preferred choice where superior mechanical performance and long-term durability are essential engineering requirements.
Specifications
Metric Grade 10.9 Fasteners are high-strength metric fastening components defined by controlled mechanical properties, precise dimensional specifications, and consistent technical performance. Suitable for demanding assemblies, they are selected by thread size, length, and load requirements, with properties commonly aligned to industry-grade metric fastener requirements.
| Property | Value |
|---|---|
| Tensile Strength | 1040 MPa min |
| Yield Strength | 940 MPa min |
| Elongation | 9% min |
| Reduction of Area | 35% min |
| Hardness | 32–39 HRC |
| Modulus of Elasticity | 200 GPa |
| Density | 7.85 g/cm³ |
| Max Service Temperature | 300°C |
| Heat Treatment | Quenched & Tempered |
| Category | Details |
|---|---|
| Bolt Standard | ISO 4014 / ISO 4017 |
| Stud Bolt Standard | DIN 976 / ISO 8735 |
| Nut Standard | ISO 4032 / ISO 4033 |
| Washer Standard | ISO 7089 / ISO 7091 |
| Thread Form | Metric Coarse & Fine (ISO 68-1) |
| Diameter Range | M3 to M100 |
| Length Range | 10 mm to 500 mm |
| Product Forms | Bolts, Studs, Nuts, Screws, Washers |
| Custom Sizes | Available on request |
Applications
