Nickel Alloys Inconel 625 Socket Head Cap Screws
The Inconel 625 Socket Head Cap Screw is a high-precision, high-strength fastener characterized by its cylindrical head and internal hexagonal drive (Allen drive). This design is ideal for applications requiring high tightening torque and installation in constrained spaces. Manufactured from the versatile nickel-chromium-molybdenum superalloy, UNS N06625 (Alloy 625), these screws are primarily strengthened by the solid-solution effects of molybdenum and niobium. This material exhibits remarkable properties, including exceptional high-temperature performance retaining strength up to 982°C (1800°F) and outstanding corrosion resistance. The high alloying content ensures near-immunity to chloride ion stress corrosion cracking (SCC) and superior resistance to pitting and crevice corrosion in aggressive marine and acidic environments. Inconel 625 socket head cap screws are essential components in critical machine assemblies, aerospace engine parts, high-pressure equipment, and specialized tooling. We manufacture and supply these screws in compliance with standards such as ASME B18.3 (dimensional) and material specifications like ASTM F2281 and ASTM B446.
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Chemical Composition (UNS N06625 / Alloy 625)
| Element | Composition (%) |
|---|---|
| Nickel (Ni) | 58.0 Min |
| Chromium (Cr) | 20.0 to 23.0 |
| Molybdenum (Mo) | 8.0 to 10.0 |
| Niobium + Tantalum (Nb + Ta) | 3.15 to 4.15 |
| Iron (Fe) | 5.0 Max |
| Carbon (C) | 0.10 Max |
| Cobalt (Co) | 1.0 Max |
| Aluminum (Al) | 0.40 Max |
| Titanium (Ti) | 0.40 Max |
| Silicon (Si) | 0.50 Max |
| Manganese (Mn) | 0.50 Max |
| Phosphorus (P) | 0.015 Max |
| Sulfur (S) | 0.015 Max |
Note: Composition according to specifications like ASTM B446 ASME SB446.
Mechanical Properties (UNS N06625 / Alloy 625)
| Property | Minimum Value |
|---|---|
| Ultimate Tensile Strength (MPa) | 930 |
| Yield Strength (0.2% Proof) (MPa) | 517 |
| Elongation (%) | 42.5 Min |
| Density (g cm⁻³) | 8.44 Typical |
| Melting Range (°C) | 1290 to 1350 |
| High-Temperature Limit (°C) | 982 |
Values are typical and may vary based on specific product form, size, and heat treatment.