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| Property | Value |
|---|---|
| UNS Number | G43400 |
| DIN Equivalent | 1.6511 (34CrNiMo6 close equiv.) |
| Tensile Strength | 1080–1240 MPa (Q&T) |
| Yield Strength | 860–1030 MPa |
| Hardness | 30–38 HRC |
| Density | 7.85 g/cm³ |
| Element | Composition (%) |
|---|---|
| C | 0.36–0.44 |
| Ni | 1.30–1.70 |
| Cr | 1.00–1.40 |
| Mo | 0.20–0.35 |
| Mn | 0.45–0.70 |
| Si | 0.10–0.35 |
| P | ≤0.035 |
EN 24 (4340 equivalent) is a low alloy steel strengthened primarily through nickel, chromium and molybdenum additions. Nickel enhances toughness and impact resistance at lower temperatures, while chromium improves hardenability and wear resistance. Molybdenum minimises temper embrittlement and supports strength retention during tempering. Carbon content, typically around 0.4%, provides the base hardness achievable through heat treatment. This balanced composition allows deep hardening in thick sections, ensuring uniform mechanical properties throughout heavy fasteners without sacrificing ductility or fatigue performance.
These alloying characteristics make EN 24 fasteners ideal for high-stress structural, automotive and heavy engineering applications requiring superior tensile strength, fatigue resistance and shock load capacity. Its excellent hardenability allows through-hardening in large diameter bolts and studs, while controlled tempering provides an optimal balance between strength and toughness. Though not stainless, EN 24 offers good resistance to general atmospheric corrosion when properly coated or plated. Its reliability under dynamic loading, combined with proven machinability and weldability, makes it a preferred choice for critical fastening applications in demanding mechanical systems.
Specifications
EN 24 (4340 Equiv.) Fasteners combine high strength and toughness, with dimensional options and technical data defined by mechanical properties, thread sizes, and geometry. The specification profile emphasizes hardness and tensile performance for reliable fit in demanding service conditions and engineering assemblies.
| Property | Value |
|---|---|
| Tensile Strength | 1080–1240 MPa (Q&T) |
| Yield Strength | 860–1030 MPa |
| Elongation | 12–16% |
| Reduction of Area | 45–55% |
| Hardness | 30–38 HRC |
| Modulus of Elasticity | 200 GPa |
| Thermal Conductivity | 40 W/m·K |
| Density | 7.85 g/cm³ |
| Max Service Temperature | 425°C |
| Heat Treatment | Quenched & Tempered |
| Standard Type | Details |
|---|---|
| Bolt Standard | ASTM A320, ASME B18.2.1 |
| Stud Bolt Standard | ASTM A193, MSS SP-75 |
| Nut Standard | ASME B18.2.2, ASTM A194 |
| Washer Standard | ASME B18.22.1 |
| Thread Form | UNC, UNF, Metric Coarse/Fine |
| Diameter Range | M6 – M100 / 1/4" – 4" |
| Length Range | 10mm – 500mm (custom available) |
| Product Forms | Bolts, Studs, Nuts, Washers, Screws |
| Custom Sizes | Available on request |
| Inspection Standards | EN 10204 3.1 / 3.2 |
Applications
