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INCONEL 718 FASTENERS | ULTIMATE GUIDE
Ananka Fasteners is a premier manufacturer and global supplier of ultra-high-strength Inconel 718 Fasteners (UNS N07718 / W.Nr. 2.4668). As a precipitation-hardenable nickel-chromium alloy, Alloy 718 features exceptionally high yield, tensile, and creep-rupture properties at temperatures up to 1300°F (704°C), making it the ultimate fastening solution for aerospace, oil and gas, and extreme engineering applications.
■ Complete Range of Inconel 718 Fasteners
We manufacture a complete range of age-hardened Alloy 718 fastening components to meet exacting industrial tolerances. Click on specific categories below for detailed dimension tables and individual specifications (Links updating soon).
| Bolts & Screws | Nuts & Washers | Studs & Rods |
|---|---|---|
| Hex Bolts / Heavy Hex Bolts | Hex Nuts / Heavy Hex Nuts | Fully Threaded Studs |
| Socket Head Cap Screws | 12-Point Nuts / Lock Nuts | Double Ended Studs |
| 12-Point Flange Bolts | Flat Washers / Spring Washers | Threaded Rods / Tie Rods |
| Countersunk Screws / Set Screws | Dome Nuts / Square Nuts | Custom CNC Machined Studs |
■ Inconel Alloy 718 Material Specifications
| Material Equivalent Grades | UNS N07718 | W.Nr. 2.4668 | Alloy 718 | NiCr19Fe19Nb5Mo3 | AFNOR NC19FeNb |
|---|---|
| Standard Specifications | ASTM B637 / ASME SB637 (Precipitation Hardening Alloy) API 6A / NACE MR0175 (For Oil & Gas Applications) |
| Size Range | Metric: M3 to M60 | Imperial: 1/4" to 4" (Custom dimensions engineered to print) |
| Thread Types | Metric Coarse, Metric Fine, UNC, UNF, BSW, BSF |
| Dimensions Standards | DIN, ISO, UNI, CSN, EN, BS, ANSI/ASME (e.g., ASME B18.2.1, B18.2.2) |
■ Chemical Composition of Alloy 718
Inconel 718 derives its immense strength from a combination of Niobium (Nb), Titanium (Ti), and Aluminum (Al) combining with Nickel during the precipitation-hardening (age-hardening) heat treatment process.
| Ni (Nickel) | Cr (Chromium) | Fe (Iron) | Nb + Ta (Niobium) | Mo (Molybdenum) | Ti (Titanium) | Al (Aluminum) | C (Carbon) |
|---|---|---|---|---|---|---|---|
| 50.0 - 55.0% | 17.0 - 21.0% | Balance | 4.75 - 5.50% | 2.80 - 3.30% | 0.65 - 1.15% | 0.20 - 0.80% | 0.08% Max |
■ Mechanical & Physical Properties (Age-Hardened)
Note: Properties represent typical minimums for age-hardened material as per ASTM B637.
| Tensile Strength (Min) | Yield Strength 0.2% Offset (Min) | Elongation (%) | Hardness (Rockwell) | Melting Range |
|---|---|---|---|---|
| 1275 MPa (185 ksi) | 1034 MPa (150 ksi) | 12% Min | 36 - 40 HRC | 1260 - 1336°C (2300 - 2437°F) |
■ Standard Product Pages
Explore our dedicated standard pages for specific fastener categories to view detailed dimensions, availability, and specific technical data:
- Inconel 718 Bolts: Comprehensive range of heavy hex, flange, and socket head configurations.
- Inconel 718 Nuts: View our dedicated page for standard hex, heavy hex, and prevailing torque locknuts.
- Inconel 718 Studs: Fully threaded, double-ended, and custom machined tie rods for high-pressure joints.
- Inconel 718 Washer: Fully threaded, double-ended, and custom machined tie rods for high-pressure joints.
■ Torque & Installation Guidelines (UNC Threads)
To proactively counteract galling and achieve an accurate, highly predictable tension-to-torque relationship, the application of engineered high-temperature nickel-compatible anti-seize lubricants is functionally mandatory during assembly. (Note: Torque values reflect the ultra-high yield strength of age-hardened Alloy 718).
| Nominal Diameter | Threads Per Inch (UNC) | Target Torque – Dry (ft-lbs) | Target Torque – Lubricated (ft-lbs) |
|---|---|---|---|
| 1/2" | 13 | 133.0 | 100.0 |
| 5/8" | 11 | 264.0 | 198.0 |
| 3/4" | 10 | 468.0 | 351.0 |
| 1" | 8 | 1136.0 | 852.0 |
■ Key Characteristics & Applications
Inconel 718 is arguably the most widely used precipitation-hardened nickel alloy. In addition to high mechanical strength, it exhibits excellent weldability and is highly resistant to post-weld cracking. It maintains outstanding corrosion resistance in a wide variety of severe environments.
- Oil & Gas Exploration: Downhole tooling, wellhead components, blow-out preventers (BOP), and gate valves (often manufactured to API 6A / NACE MR0175 standards).
- Aerospace & Defense: Jet engine components, rocket motors, spacecraft structural hardware, and gas turbine blading.
- Cryogenics: Highly ductile and tough at cryogenic temperatures, making it ideal for liquid fuel and cryogenic storage fasteners.
- Nuclear Reactors: Core components and pump shafts subjected to intense mechanical stress and pure water corrosion.