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| Property | Value |
|---|---|
| Standard | ISO 898-1 / DIN 267 |
| Tensile Strength | 800 MPa min |
| Yield Strength | 640 MPa min |
| Hardness | 22–32 HRC |
| Core Material | Medium Carbon Steel, Quenched & Tempered |
| Corrosion Rating | Moderate (Zinc/Yellow Plated) |
| Element | Composition (%) |
|---|---|
| C | 0.15–0.40 |
| Mn | 0.50–1.40 |
| P | ≤0.035 |
| S | ≤0.035 |
| Cr+Mo+Ni | as req. for hardenability |
Metric Grade 8.8 fasteners are manufactured from medium carbon steel, typically alloyed with controlled levels of carbon, manganese, and boron to enhance hardenability and strength. Carbon content, usually between 0.28% and 0.55%, provides the primary strengthening mechanism through quench and temper heat treatment. Manganese improves hardenability and tensile strength while boron, when added, further refines grain structure and boosts core strength in smaller diameters, ensuring consistent mechanical performance across production batches.
The quenched and tempered microstructure delivers a superior balance of tensile strength, yield strength, and ductility, making Grade 8.8 fasteners ideal for structural, automotive, and machinery applications requiring high clamping loads. Zinc or other protective platings enhance corrosion resistance against atmospheric conditions, while the material maintains reliable performance up to moderate service temperatures. This combination of strength, toughness, and cost-effectiveness makes Grade 8.8 fasteners a preferred choice for demanding engineering assemblies worldwide.
Specifications
Metric Grade 8.8 Fasteners are high-strength metric components defined by their mechanical properties, dimensional specifications, and technical data for reliable structural performance. Suitable for precision assembly, they combine standardized sizing with strength characteristics that support demanding fastening applications across industrial and mechanical systems.
| Property | Value |
|---|---|
| Tensile Strength | 800 MPa min |
| Yield Strength | 640 MPa min |
| Elongation | 12% min |
| Hardness | 22–32 HRC |
| Modulus of Elasticity | 200 GPa |
| Thermal Expansion | 11.5 x10⁻⁶/°C |
| Density | 7.85 g/cm³ |
| Melting Range | 1420–1460°C |
| Heat Treatment | Quenched & Tempered |
| Max Service Temperature | 300°C |
| Standard | Details |
|---|---|
| Bolt Standard | ISO 4014 / ISO 4017 |
| Stud Bolt Standard | DIN 976 / ASTM A193 equivalent |
| Nut Standard | ISO 4032 / ISO 4033 |
| Washer Standard | ISO 7089 / ISO 7090 |
| Thread Form | Metric Coarse & Fine (ISO 261/262) |
| Diameter Range | M3 – M100 |
| Length Range | 10mm – 500mm |
| Product Forms | Bolts, Studs, Nuts, Washers, Screws |
| Custom Sizes | Available on Request |
| Inspection Standards | EN 10204 3.1 / 3.2 |
Applications
