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| UNS Number | N07718 |
| ASTM/ASME Standard | ASTM B637 / AMS 5662 |
| Tensile Strength | 1275 MPa min |
| Yield Strength | 1030 MPa min |
| Density | 8.19 g/cm³ |
| Max Service Temperature | 700°C |
| Element | Composition (%) |
|---|---|
| Ni | 50.0–55.0 |
| Cr | 17.0–21.0 |
| Mo | 2.8–3.3 |
| Nb+Ta | 4.75–5.50 |
| Fe | bal |
| Ti | 0.65–1.15 |
| Al | 0.20–0.80 |
| C | ≤0.08 |
Inconel 718 Fasteners derive their exceptional performance from a carefully balanced composition of nickel, chromium, and iron, strengthened by niobium and molybdenum additions. Niobium promotes the formation of gamma double-prime precipitates, which provide outstanding age-hardening capability and high-temperature strength retention. Chromium contributes to oxidation and corrosion resistance, while molybdenum enhances resistance to pitting and crevice attack in aggressive environments, making the alloy highly versatile across demanding industrial conditions.
These alloying characteristics translate into fasteners with superior tensile and yield strength, excellent fatigue resistance, and stable mechanical performance from cryogenic temperatures up to 700°C. Inconel 718 Fasteners resist stress corrosion cracking, oxidation, and creep, making them ideal for aerospace engines, gas turbines, oil and gas equipment, and other high-stress, high-temperature assemblies requiring long-term reliability and structural integrity.
Specifications
Inconel 718 Fasteners combine high-temperature strength, corrosion resistance, and precise dimensional control for demanding aerospace, marine, and chemical service. Their specifications emphasize mechanical properties, thread geometry, and size tolerances, with technical data defined to meet relevant industry standards for reliable performance under severe operating conditions.
| Property | Value |
|---|---|
| Tensile Strength | 1275 MPa min |
| Yield Strength (0.2% Offset) | 1030 MPa min |
| Elongation | 12% min |
| Reduction of Area | 15% min |
| Hardness | 36–44 HRC |
| Modulus of Elasticity | 200 GPa |
| Thermal Expansion (20–100°C) | 13.0 µm/m·°C |
| Thermal Conductivity | 11.4 W/m·K |
| Density | 8.19 g/cm³ |
| Melting Range | 1260–1336°C |
| Heat Treatment | Solution + Precipitation Hardened |
| Max Service Temperature | 700°C |
| Specification | Details |
|---|---|
| Bolt Standard | ASME B18.2.1, DIN 931/933 |
| Stud Bolt Standard | ASME B16.5, MSS SP-75 |
| Nut Standard | ASME B18.2.2, DIN 934 |
| Washer Standard | ASME B18.22.1, DIN 125 |
| Thread Form | UNC, UNF, Metric Coarse/Fine |
| Diameter Range | M6 to M64 / 1/4" to 2.5" |
| Length Range | 10mm to 300mm |
| Available Product Forms | Bolts, Studs, Screws, Nuts, Washers |
| Custom Sizes | Available on request |
| Manufacturing Standards | AMS 5662, AMS 5663 |
| Inspection Standards | NACE MR0175, PMI Testing, RT/UT |
Applications
