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| Property | Value |
|---|---|
| UNS Number | N07263 |
| DIN Number | 2.4650 |
| Standard | ASTM B637 / AMS 5872 |
| Tensile Strength | 1000 MPa min |
| Yield Strength | 600 MPa min |
| Max Service Temp | 900°C |
| Element | Composition (%) |
|---|---|
| Ni | bal |
| Co | 19.0–21.0 |
| Cr | 19.0–21.0 |
| Mo | 5.6–6.1 |
| Ti | 1.9–2.4 |
| Al | 0.3–0.7 |
| Fe | ≤0.7 |
| C | ≤0.06 |
Nimonic 263 fasteners derive their exceptional performance from a carefully balanced composition of nickel, chromium, cobalt and molybdenum, strengthened by controlled additions of titanium and aluminium. Chromium provides the primary defence against oxidation and corrosive attack by forming a stable protective oxide layer, while cobalt enhances high-temperature strength and structural stability. Molybdenum contributes solid-solution strengthening, improving resistance to creep and thermal fatigue. Titanium and aluminium combine to form gamma prime precipitates, which are responsible for the alloy’s remarkable age-hardening response and mechanical strength at elevated temperatures.
These metallurgical characteristics make Nimonic 263 fasteners highly suitable for demanding fastening applications where high strength, oxidation resistance and thermal stability are essential. The alloy maintains excellent tensile and creep properties up to 900°C, resists scaling and corrosive degradation in aggressive environments, and retains dimensional stability under cyclic thermal loading. Its superior fatigue resistance and toughness ensure long-term reliability in aerospace, gas turbine and high-temperature industrial fastening applications, making it a preferred choice for critical bolted joints.
Specifications
Nimonic 263 Fasteners are high-performance alloy components defined by precise dimensional specifications and dependable mechanical properties for demanding high-temperature service. Their technical data typically covers size range, thread configuration, strength, hardness, and corrosion resistance, ensuring reliable fastening performance in aerospace and thermal applications.
| Property | Value |
|---|---|
| Tensile Strength | 1000–1200 MPa |
| Yield Strength (0.2%) | 600–700 MPa |
| Elongation | 15–25% |
| Hardness | 280–320 HB |
| Modulus of Elasticity | 218 GPa |
| Thermal Expansion (20–100°C) | 11.4 µm/m°C |
| Thermal Conductivity | 11.7 W/m·K |
| Density | 8.36 g/cm³ |
| Melting Range | 1300–1355°C |
| Heat Treatment | Solution treat + age harden |
| Max Service Temperature | 900°C |
| Feature | Details |
|---|---|
| Bolt Standard | ASTM B637, ISO 4014 |
| Stud Bolt Standard | ASME B18.31.3 |
| Nut Standard | ASTM B637, ISO 4032 |
| Washer Standard | ASME B18.21.1 |
| Thread Form | UNC, UNF, Metric Coarse/Fine |
| Diameter Range | M6 – M64 / 1/4" – 2.5" |
| Length Range | 10mm – 300mm |
| Product Forms | Bolts, Studs, Nuts, Washers, Screws |
| Custom Sizes | Available on request |
| Manufacturing Standard | ASTM, ASME, DIN, ISO |
| Inspection Standard | EN 10204 3.1 / 3.2 |
Applications
