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Inconel 625 fasteners are high-performance nickel-chromium alloy fasteners known for their exceptional resistance to heat and corrosion. These fasteners are widely used in industries where durability under extreme conditions is essential.
Manufactured from Inconel 625, these fasteners offer superior mechanical strength, making them ideal for high-stress applications. They maintain structural integrity even at elevated temperatures, ensuring reliable performance in critical systems.
The corrosion resistance of Inconel 625 fasteners makes them suitable for use in chemical processing plants, marine environments, and applications exposed to oxidizing agents. They withstand oxidation and corrosion where standard stainless steels may fail.
These fasteners are available in a variety of types, including bolts, nuts, screws, studs, and washers, catering to diverse industrial requirements. Custom sizes and threads can also be produced to meet specific engineering specifications.
Inconel 625 fasteners are widely utilized in the aerospace and power generation sectors due to their ability to perform reliably under extreme thermal and mechanical stresses. They are often used in turbine engines, heat exchangers, and exhaust systems.
The material’s resistance to scaling at high temperatures ensures long service life, reducing maintenance costs and downtime. Inconel 625 fasteners are also capable of withstanding repeated thermal cycling without degradation.
These fasteners are precision-engineered to meet international standards such as ASTM, ASME, and ISO. Compliance with these standards guarantees consistency, quality, and reliability in critical applications.
Inconel 625 fasteners are often chosen for applications in the petrochemical and oil & gas industries, where exposure to aggressive chemicals and high-pressure conditions is common. Their strength and corrosion resistance make them indispensable in such environments.
Specification Table
| Specification | Details |
|---|---|
| Standard | ASTM B446 / B564 / B366, ASME SB446 / SB564 / SB366 |
| Grade | Inconel 625 (UNS N06625) |
| Equivalent Standards | Werkstoff Nr. 2.4856 |
| Size Range | M3 to M56 | 3/16” to 2” | Custom sizes available |
| Length | 3 mm to 200 mm or as required |
| Type of Fasteners | Bolts, Nuts, Screws, Washers, Studs, Threaded Rods, Socket Head Cap Screws, Machine Screws |
| Thread Type | Metric, UNC, UNF, BSW, BSF, NPT, BSP, Acme |
| Surface Finish | Bright, Black Oxide, Zinc Plated, Hot Dip Galvanized, Passivated |
| Coating | PTFE, Xylan, Teflon, Cadmium, Zinc, Nickel |
| Temperature Range | -196°C to 982°C (-320°F to 1800°F) |
| Density | 8.44 g/cm³ |
| Melting Point | 1290°C – 1350°C (2350°F – 2460°F) |
| Corrosion Resistance | Excellent resistance to pitting, crevice, and stress-corrosion cracking in chloride and oxidizing environments. |
| Applications | Aerospace, Marine, Chemical Processing, Oil & Gas, Power Generation, Heat Exchangers, Offshore Equipment |
Chemical Composition (Typical ranges for SS625)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Percentage (%) |
|---|---|
| Nickel (Ni) | 58.0 min |
| Chromium (Cr) | 20.0 – 23.0 |
| Molybdenum (Mo) | 8.0 – 10.0 |
| Niobium + Tantalum (Nb + Ta) | 3.15 – 4.15 |
| Iron (Fe) | 5.0 max |
| Titanium (Ti) | 0.40 max |
| Aluminum (Al) | 0.40 max |
| Manganese (Mn) | 0.50 max |
| Silicon (Si) | 0.50 max |
| Carbon (C) | 0.10 max |
| Phosphorus (P) | 0.015 max |
| Sulfur (S) | 0.015 max |
Mechanical Properties (Typical)
| Property | Metric | Imperial |
|---|---|---|
| Tensile Strength | 827 MPa min | 120,000 psi min |
| Yield Strength (0.2% Offset) | 414 MPa min | 60,000 psi min |
| Elongation | 30% min | 30% min |
| Hardness (Rockwell B) | ≤ 100 HRB | ≤ 100 HRB |
| Melting Point | 1290°C – 1350°C | 2350°F – 2460°F |
| Density | 8.44 g/cm³ | 0.305 lb/in³ |
| Modulus of Elasticity | 207 GPa | 30 x 10³ ksi |
| Poisson’s Ratio | 0.278 | 0.278 |
| Thermal Conductivity (at 21°C) | 9.8 W/m·K | 68 BTU·in/hr·ft²·°F |
| Electrical Resistivity (at 21°C) | 1.29 µΩ·m | 51 µΩ·in |
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| UNS | N06625 |
| Werkstoff Nr. | 2.4856 |
| AFNOR | NC22DNb |
| BS | NA21 |
| EN | NiCr22Mo9Nb |
| JIS | NW6625 |
| GOST | ЭП567 (EP567) |
| ISO | NiCr22Mo9Nb |
Dimension & Weight Chart (Selected common sizes)
Below is a representative chart showing outside diameter, wall thickness, inside diameter, cross-sectional area of metal and calculated weight per metre (kg/m). Values are calculated using density = 7.93 g/cm³ and are for guidance — use actual MTC values for procurement & engineering.
| Nominal Diameter (mm) | Pitch (mm) | Head Across Flats (mm) | Head Height (mm) | Approx. Weight (kg/100 pcs) |
|---|---|---|---|---|
| M6 | 1.00 | 10 | 4 | 0.25 |
| M8 | 1.25 | 13 | 5.3 | 0.50 |
| M10 | 1.50 | 17 | 6.4 | 0.95 |
| M12 | 1.75 | 19 | 7.5 | 1.40 |
| M16 | 2.00 | 24 | 10.0 | 2.80 |
| M20 | 2.50 | 30 | 12.5 | 5.00 |
| M24 | 3.00 | 36 | 15.0 | 8.30 |
| M30 | 3.50 | 46 | 18.7 | 15.00 |
| M36 | 4.00 | 55 | 22.5 | 25.00 |
| M42 | 4.50 | 65 | 26.0 | 38.00 |
Common Types Of Fasteners
Bolts
Nuts
Steel Screw
Washer
Stud Bolts
Frequently Asked Questions (FAQ)
What is an Inconel 625 Fastener?
Inconel 625 fasteners are made from a nickel-chromium-molybdenum-niobium alloy known for its exceptional corrosion resistance, high strength, and excellent fatigue performance across a wide temperature range. These fasteners are ideal for harsh environments such as marine, aerospace, and chemical industries.
What are the key benefits of Inconel 625 Fasteners?
They offer outstanding resistance to pitting, crevice corrosion, and stress-corrosion cracking, as well as excellent strength and oxidation resistance at temperatures up to 982°C (1800°F). Inconel 625 fasteners maintain mechanical integrity in aggressive chemical and seawater conditions.
What are the typical applications of Inconel 625 Fasteners?
Inconel 625 fasteners are used in aerospace components, marine hardware, offshore oil & gas platforms, chemical processing plants, heat exchangers, and exhaust systems due to their ability to perform reliably in high-stress and corrosive environments.
What standards cover Inconel 625 Fasteners?
They conform to ASTM B446, B564, and ASME SB446 / SB564 specifications, ensuring consistent material properties and dimensional accuracy for industrial use.
Can Inconel 625 Fasteners be customized?
Yes, Inconel 625 fasteners can be customized in various sizes, thread types (UNC, UNF, Metric), and coatings (PTFE, Xylan, Zinc, Nickel) depending on the application requirements.
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