Inconel Fasteners Manufacturers in India
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Aashish Metals has a factory and supply of Inconel Fasteners in Mumbai, India, providing high-temperature and corrosion-resistant fasteners for challenging industrial environments. Supplied in accordance with the required specification, our Inconel fasteners are produced with quality controlled nickel alloy materials, and are prepared in grades such as Inconel 600, 601, 625 and 718. We have bolts, nuts, washers and screws, and other customisable combinations of fasteners in standard and non-standard sizes.
Depending on the product and grade, our Inconel Fasteners are manufactured to meet the applicable ASTM, ASME, DIN, ISO and ANSI specifications. They come in a variety of sizes and types such as Inconel Hex Bolts, Heavy Hex Bolts, Socket Head Cap Screws, Anchor Bolts, Tap Bolts and Stud Bolts. In addition, custom dimensions, thread forms, lengths and finishes can be provided based on the project requirements.
Aashish Metals is all about dimensional accuracy, material traceability and consistent product quality. Additional inspection or testing documentation and/or Mill Test Certificates may be provided as necessary. Our Inconel fasteners can be used in high-temperature, corrosive, chemical, petrochemical, power generation, marine and industrial pipe environments.
What are Inconel fasteners?
Inconel fasteners are bolts, studs, nuts, screws, washers and threaded rods made from Inconel nickel-chromium alloys such as 600, 601, 625 and 718. They keep their strength and resist oxidation and corrosion at high temperatures and in aggressive media, where stainless steel and carbon steel fasteners would fail.
Inconel Fasteners Grades
Inconel 625 bolts and fasteners (UNS N06625)
Alloy 625 gets its strength from molybdenum and niobium in solution, not from ageing, which means it stays tough, weldable and highly resistant to pitting, crevice corrosion and chloride cracking. That is why inconel 625 bolts and inconel 625 fasteners are the usual choice for seawater, offshore, chemical and flue-gas service. If your drawing says alloy 625 bolts, it means the same material, and you may also see it written as N06625 or W.Nr. 2.4856.
Inconel Fasteners 718 and Bolts (UNS N07718)
718 is the high-strength option. It is a precipitation-hardened alloy, so after solution treatment and ageing, inconel 718 bolts reach roughly 1,240 MPa tensile and 1,030 MPa yield, far above 625, with good performance up to around 650–700 °C. It is used in turbines, aerospace, oil-field and sour-gas hardware. Inconel 718 fasteners, inconel 718 screws and inconel 718 socket head cap screws are all supplied in the aged condition unless you specify otherwise. Do not weld them after ageing without a procedure.
Inconel 600 Fasteners and Bolts (UNS N06600)
Alloy 600 is a nickel-chromium-iron alloy that resists oxidation to very high temperatures and chloride stress-corrosion cracking, and it is immune in caustic and many reducing media. Inconel 600 bolts and inconel 600 fasteners are common in furnaces, heat treatment, nuclear and chemical plants. It is a solid-solution alloy, so strength is moderate and cannot be raised by heat treatment.
Inconel 601 Fasteners (UNS N06601)
Alloy 601 adds aluminium to the 600 recipe for outstanding oxidation and scaling resistance up to about 1,150 °C. Inconel 601 fasteners are chosen for furnace fixtures, burners, radiant tubes and heat-treatment baskets.
Other Inconel grades on request
| Property / use | Inconel 600 | Inconel 601 | Inconel 625 | Inconel 718 |
|---|---|---|---|---|
| UNS | N06600 | N06601 | N06625 | N07718 |
| Werkstoff (W.Nr.) | 2.4816 | 2.4851 | 2.4856 | 2.4668 |
| Strengthening | Solid solution | Solid solution | Solid solution (Mo, Nb) | Precipitation hardened |
| Best for | Oxidation, caustic, chloride SCC, moderate strength | Very high temperature oxidation and scaling | Seawater, chlorides, fatigue, weldability | Highest strength, turbines, aerospace, oil & gas |
| Avoid when | High strength needed | High strength needed; sulphur-bearing gases | Very high strength is the priority | Welding after ageing; long exposure above about 700 °C |
| Bar / bolting standard | ASTM B166 | ASTM B166 | ASTM B446 (B166) | ASTM B637 |
Technical data
Inconel Fasteners We Supply
Inconel bolts, inconel screws, inconel nuts and inconel washers are ordered under many names. Here is how our range breaks down.
| Product | Typical forms and standards | Common use |
|---|---|---|
| Hex bolts and heavy hex bolts | ASME B18.2.1, ASTM F468, ISO 4014 / 4017, DIN 931 / 933 | Flange joints, casings, exhaust systems |
| Stud bolts | Full-thread and double-ended, UNC 8UN, metric, custom lengths | Pressure flanges, turbine and valve bodies |
| Threaded rod | DIN 975 style, metric and UNC, cut to length | Supports, tie rods, furnace hardware |
| Nuts | Hex, heavy hex, dome, lock, coupling, castle; ASTM F467, ASME B18.2.2 | Matched to bolts and studs |
| Washers | Flat, spring, lock, tab and square washers | Load spreading, locking |
| Socket head cap screws and machine screws | ASME B18.3, ISO 4762; includes inconel 718 screws | Compact, high-strength joints |
| Rivets | Solid rivets to drawing [confirm grades and sizes] | Heat shields, exhaust and sheet-metal assemblies |
| Set screws, eye bolts, U-bolts, foundation bolts | Standard and custom per drawing | Supports, anchoring, lifting points |
| Custom fasteners | Made to drawing or sample | OEM, repair and prototype work |
If you already know your grade, go straight to our pages for Inconel 600 fasteners, Inconel 601 fasteners, Inconel 625 fasteners or Inconel 718 fasteners, or browse all Inconel products.
Inconel Fasteners Equivalent Grades
| Grade | UNS | Werkstoff Nr. | EN designation | Common trade names |
|---|---|---|---|---|
| Inconel 600 | N06600 | 2.4816 | NiCr15Fe | Alloy 600, NCF 600 |
| Inconel 601 | N06601 | 2.4851 | NiCr23Fe | Alloy 601, NCF 601 |
| Inconel 625 | N06625 | 2.4856 | NiCr22Mo9Nb | Alloy 625, NCF 625 |
| Inconel 718 | N07718 | 2.4668 | NiCr19Fe19Nb5Mo3 | Alloy 718, NCF 718 |
Engineer’s quick rule: Highest strength: 718. Corrosion plus toughness and weldability: 625. Extreme oxidation and scaling in furnaces: 601 or 600. If you are not sure, send us your temperature, load, media and standard, and we will help you pick before you order.
Inconel Fasteners Chemical Composition
| Element (%) | Inconel 600 | Inconel 601 | Inconel 625 | Inconel 718 |
|---|---|---|---|---|
| Nickel | 72.0 min | 58.0 – 63.0 | 58.0 min | 50.0 – 55.0 |
| Chromium | 14.0 – 17.0 | 21.0 – 25.0 | 20.0 – 23.0 | 17.0 – 21.0 |
| Iron | 6.0 – 10.0 | Balance | 5.0 max | Balance |
| Molybdenum | – | – | 8.0 – 10.0 | 2.8 – 3.3 |
| Niobium (+Ta) | – | – | 3.15 – 4.15 | 4.75 – 5.50 |
| Titanium | – | – | 0.40 max | 0.65 – 1.15 |
| Aluminium | – | 1.0 – 1.7 | 0.40 max | 0.20 – 0.80 |
| Carbon | 0.15 max | 0.10 max | 0.10 max | 0.08 max |
| Manganese | 1.0 max | 1.0 max | 0.50 max | 0.35 max |
| Silicon | 0.50 max | 0.50 max | 0.50 max | 0.35 max |
| Copper | 0.50 max | 1.0 max | – | 0.30 max |
| Sulphur | 0.015 max | 0.015 max | 0.015 max | 0.015 max |
Inconel Fasteners Mechanical Properties
| Typical property | Inconel 600 | Inconel 601 | Inconel 625 | Inconel 718 (aged) |
|---|---|---|---|---|
| Density | 8.47 g/cm³ | 8.11 g/cm³ | 8.44 g/cm³ | 8.19 g/cm³ |
| Melting range | 1354 – 1413 °C | 1360 – 1411 °C | 1290 – 1350 °C | 1260 – 1336 °C |
| Tensile strength (min.) | 550 MPa (80 ksi) | 550 MPa (80 ksi) | 690 – 827 MPa (100 – 120 ksi) | 1240 MPa (180 ksi) |
| Yield, 0.2% (min.) | 240 MPa (35 ksi) | 205 MPa (30 ksi) | 276 – 414 MPa (40 – 60 ksi) | 1030 MPa (150 ksi) |
| Elongation (min.) | 30% | 30% | 30% | 12% |
| Approx. max. service temp. (oxidation) | About 1090 °C | About 1150 °C | About 980 °C | About 700 °C (strength-limited) |
Values are typical minimums for annealed bar (600, 601, 625) and for aged bar to ASTM B637 (718). Inconel 625 shows a range because ASTM B446 has an annealed grade and a solution-annealed grade. Your MTC gives the real figures, so design from those.
Inconel Fasteners Specification
| Parameter | Details |
|---|---|
| Grades | Inconel 600, 601, 625, 718 (X-750 and others on request) |
| Raw material standards | ASTM B166 (600, 601, 625), ASTM B446 (625), ASTM B637 (718); forgings to ASTM B564 |
| Fastener standards | ASTM F468 (bolts, cap screws, studs), ASTM F467 (nuts), or to customer specification |
| Dimensional standards | ASME B18.2.1 / B18.2.2, ASME B18.3, ISO 4014 / 4017 / 4032 / 4762, DIN 931 / 933 / 934 / 912 / 975, or to your drawing |
| Thread standards | Metric coarse and fine, UNC, UNF, 8UN; classes 6g/6H and 2A/2B |
| Size range | M6 to M64 and 1/4" to 2-1/2" typical; larger on request [confirm] |
| Length | Bolts to your length; threaded rod in 1–3 m lengths [confirm] |
| Condition | Annealed (600, 601, 625); solution treated and aged (718) |
| Surface finish | Plain, pickled, polished, PTFE or Xylan coated on request |
| Manufacturing | Machined from bar, hot-forged and machined, or thread-rolled |
| Certificates | EN 10204 3.1 MTC; 3.2 with third-party inspection on request |
| Packing | Bagged or boxed, palletised, export wooden cases |
Metric Hex Bolt Dimensions (ISO 4017 Style, Coarse Pitch)
| Size | Pitch (mm) | Width across flats (mm) | Head height (mm) |
|---|---|---|---|
| M8 | 1.25 | 13 | 5.3 |
| M10 | 1.5 | 16 | 6.4 |
| M12 | 1.75 | 18 | 7.5 |
| M16 | 2.0 | 24 | 10.0 |
| M20 | 2.5 | 30 | 12.5 |
| M24 | 3.0 | 36 | 15.0 |
| M30 | 3.5 | 46 | 18.7 |
| M36 | 4.0 | 55 | 22.5 |
Inch Hex Bolt Sizes (UNC / UNF)
| Size | UNC (threads per inch) | UNF (threads per inch) | Width across flats |
|---|---|---|---|
| 3/8" | 16 | 24 | 9/16" |
| 1/2" | 13 | 20 | 3/4" |
| 5/8" | 11 | 18 | 15/16" |
| 3/4" | 10 | 16 | 1-1/8" |
| 7/8" | 9 | 14 | 1-5/16" |
| 1" | 8 | 12 | 1-1/2" |
Threaded Rod Weight per Metre (Approximate, Nominal Diameter)
| Rod size | Inconel 600 (kg/m) | Inconel 601 (kg/m) | Inconel 625 (kg/m) | Inconel 718 (kg/m) |
|---|---|---|---|---|
| M8 | 0.43 | 0.41 | 0.42 | 0.41 |
| M10 | 0.67 | 0.64 | 0.66 | 0.64 |
| M12 | 0.96 | 0.92 | 0.95 | 0.93 |
| M16 | 1.70 | 1.63 | 1.70 | 1.65 |
| M20 | 2.66 | 2.55 | 2.65 | 2.57 |
| M24 | 3.83 | 3.67 | 3.82 | 3.71 |
| M30 | 5.99 | 5.73 | 5.97 | 5.79 |
| M36 | 8.62 | 8.25 | 8.59 | 8.34 |
Weight (kg/m) = diameter² × 0.006652 for 600, 0.006370 for 601, 0.006629 for 625 and 0.006433 for 718, with diameter in mm. The thread makes real weight slightly lower. Multiply by length and your quoted price per kg for a quick material estimate.
Inconel vs Other Alloy Fasteners
| Fastener material | Strong at | Weak at | Relative cost |
|---|---|---|---|
| Inconel 625 / 718 / 600 / 601 | High-temperature strength, oxidation and chloride resistance | Higher cost than stainless steel | $$$ |
| Hastelloy C276 / C22 / B2 | Hot acids, wet chlorine, HCl (B2), broad chemical resistance | Lower strength in annealed form; highest cost | $$$$ |
| Monel 400 / K500 | Hydrofluoric acid, seawater, alkalis; K500 is high strength | Oxidising acids; upper temperature limit lower than Inconel | $$$ |
| Incoloy 800 / 800H / 800HT and 825 | Carburising and sulphuric acid service, moderate temperature | Lower strength than 718 | $$ |
| A286 (1.4980) / ASTM A453 Gr 660 | High strength up to about 700 °C at lower cost than 718 | Weaker corrosion resistance than 625 | $$ |
| Alloy 20 | Sulphuric acid service | Chloride pitting; strength | $$ |
| Super duplex / SMO 254 | Chlorides, seawater, strength | Above about 300 °C for duplex | $$ |
| Titanium Gr 5 | Seawater, low weight | Reducing acids, high-temperature air | $$$ |
| 904L / 316L | Moderate corrosion, lower cost | Chlorides, high temperature | $ – $$ |
| Nitronic | Anti-galling stainless with good strength | Not for extreme temperatures or acids | $$ |
Not every job needs Inconel. If A286 or 316 meets the specification, we will say so. Use our materials guide for side-by-side data, or ask an engineer.
Inconel Fasteners Applications
| Industry | Where Inconel fasteners are used | Preferred grade |
|---|---|---|
| Power generation | Gas turbine casings, boiler and steam-line flanges, exhaust hardware | 718, 625, 600 |
| Aerospace and defence | Engine casings, exhaust systems, structural joints | 718, 625 |
| Oil & gas | Subsea, wellhead and sour-service flanges, valves, manifolds | 718, 625 |
| Chemical & petrochemical | Reformers, heat exchangers, reactor closures | 625, 600, 601 |
| Heat treatment and furnaces | Fixtures, baskets, burners, radiant tubes, muffles | 601, 600 |
| Marine and desalination | Seawater pumps, exchangers, offshore modules | 625 |
| Nuclear and steam generators | Steam generator and heat-exchanger hardware | 600, 690 on request |
| Pollution control | FGD scrubbers, incinerators, waste-to-energy | 625, 601 |
Ordering, Packing and Delivery
| Topic | Details [confirm all before publishing] |
|---|---|
| Minimum order | Trial and small lots supported; contact us |
| Lead time | Stock sizes ship quickly; made-to-order and 718 heat-treated items are quoted per job |
| Packing | Bagged or boxed, palletised, export wooden cases with marking |
| Port of dispatch | Mumbai / Nhava Sheva |
| Payment | LC, TT and other agreed terms |
| Documents | Commercial invoice, packing list, MTC, certificate of origin, inspection reports on request |
| Export | We ship across India and worldwide |
Inconel Fasteners Sizes
Inconel fasteners are available in a wide range of diameters, lengths, thread configurations and dimensions to meet different industrial requirements. Standard sizes generally include M3 to M100 metric sizes and corresponding imperial dimensions, with custom sizes available on request. Bolts, nuts, screws, studs, washers and other fastener types can be supplied according to applicable ASTM, ASME, DIN, ISO and ANSI specifications. The exact size selection depends on the fastener type, Inconel grade, application, thread standard and required load conditions.
Selection and Installation Guidance
Match the fastener to the joint
For Inconel lines, pair fasteners with matching Inconel pipes and tubes, 625 pipe fittings, threaded and socket weld fittings, and flanges. Instrument lines often need tube fittings, needle valves, ball valves and manifold valves mounted with matching hardware.
Avoid galling and seizing
Nickel alloys can gall, meaning the threads weld together as the nut turns. At high temperature, they can also seize. To reduce the risk:
- Use a nickel-based or other anti-seize free of sulphur, lead and chlorides.
- Prefer rolled threads and clean, undamaged thread surfaces.
- Run nuts on slowly. Avoid impact wrenches.
- Consider Xylan coated or PTFE coated fasteners at moderate temperatures, and check coating limits for your service.
- Validate torque with the lubricant you actually use.
Nuts and washers
Use inconel nuts and inconel washers in the same alloy as the bolt or stud. For 718 studs, a matching-strength nut in the correct condition is important, because a soft nut on a hard stud can strip.
Hot-service tips
- Allow for creep and stress relaxation in bolted joints held for years above about 500 °C, and plan re-torque or use spring washers if the design allows.
- Use silver-free, sulphur-free and lead-free marking and lubricants.
- Never weld or braze near aged 718 fasteners without a procedure. Heat can change their properties.
Inconel Fasteners Price
The price of Inconel fasteners varies according to the alloy grade, fastener type, size, thread specification, quantity, manufacturing standard, surface finish and material certification. Grades such as Inconel 600, 601, 625 and 718 may have different prices because of their composition and manufacturing requirements. Custom sizes, special threads and additional testing or certification can also affect the final cost. For an accurate Inconel fasteners price, customers can provide the required grade, dimensions, quantity and applicable standard to receive a current quotation.
Why Buy from Aashish Metals
If you search for inconel bolts suppliers or inconel fasteners manufacturers, you will find dozens of names. Here is what we think makes the difference. [Confirm whether machining is in-house or with partner shops before using the word “manufacturer” on the page.]
- Traceable material. Heat numbers and MTCs travel with every lot.
- One source for the whole joint. Fasteners, round bars, plates and sheets, fittings and flanges in matching alloys.
- Straight technical advice. We flag strength, hardness, heat-treatment and galling issues before you order.
- Wide alloy range. Compare Inconel with Hastelloy fasteners, Monel, Incoloy and A286 through one contact.
- Custom work. We make to drawing, sample or standard.
Read more about Aashish Metals, browse our technical blog, or contact our team. Raw material is available as Inconel 718 round bars, 600 round bars and 601 round bars, and see our DIN fasteners and nickel alloy products.
Frequently Asked Questions
They are used where stainless steel and carbon steel bolts cannot cope: gas turbines, aerospace engines, furnaces, refineries, chemical plants, subsea and offshore systems, and heat-treatment equipment. The alloys hold strength and resist oxidation and corrosion at high temperature and in aggressive media.
625 gets its properties from solid-solution strengthening and is prized for corrosion resistance, toughness and weldability. 718 is precipitation-hardened, so it reaches far higher strength, roughly 1,240 MPa tensile when aged, but it is best up to about 650–700 °C and needs care with welding. Choose 625 for corrosion, 718 for strength.
Yes, but with conditions. NACE MR0175 / ISO 15156 limits hardness and specifies the heat-treatment condition for 718. Always state sour service on your enquiry so we supply the correct condition and test reports, and check the current revision of the standard.
They can, especially at temperature. Use sulphur- and chloride-free anti-seize, rolled threads, slow tightening and validated torque, or a suitable coating. Avoid impact tools, and use nuts and bolts in compatible alloys.
Yes. We supply inconel screws (including 718 socket head cap screws), inconel washers and nuts as standard, and can quote inconel rivets to drawing for solid rivet types. Confirm grade and size with us.
Need Inconel bolts, studs or screws that survive the heat?
Send us your grade, size, thread and quantity, or attach a drawing. We will reply with a clear quote and the right certificates, and an engineer can help you choose between 600, 601, 625 and 718.
Products
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