Inconel 625 Fasteners: Alloy 625 / UNS N06625 Fasteners Supplier and Exporter

We make our Inconel 625 bolts and UNS N06625 nuts, hex bolts, screws, studs, threaded rods and washers using high grade UNS N06625 / WNR 2.4856 alloy which gives excellent performance in the seawater, acids, alkalis and other harsh corrosive environment. We stock the entire range of ASTM F467, ASTM F468 and ASTM B446 Inconel 625 fasteners in Mumbai. Our products can be used in high-temperature and corrosive environments reaching cryogenic temperatures as well as 982 degrees Celsius which makes them suitable in harsh conditions.

Browse through all our Inconel products such as pipes, tubes, flanges, and fasteners. To obtain information related to types, sizes, specifications, and prices, refer to our fasteners catalog.

Introduction to Inconel 625 Fasteners

Inconel 625 fasteners are premium-quality  Inconel 625 (UNS N06625) fasteners made of a nickel-based alloy that is broadly known to have excellent corrosion resistance, performance up to temperature and strength. Alloy 625 Fasteners or Nickel Alloy 625 Fasteners are fasteners made of a combination of nickel, chromium, molybdenum and niobium that provide exceptional performance under extreme conditions.

Products include Inconel 625 Hex Bolts, UNS N06625 Inconel 625 Socket Head Cap Screws, 2.4856 Alloy 625 Hex Nuts, Inconel 625 bolts, alloy 625 bolts, alloy 625 nuts, threaded rods, studs, washers and U-bolts These fittings are engineered to be used in cryogenic temperature to 982 degrees Celsius without oxidation or stress corrosion cracking. Their machinability and dimensional accuracy provide long life in saline, acidic or alkaline conditions.

Advantages of Alloy 625 Fasteners

Alloy 625 Fasteners are used across industries for their superior material properties:

• Superior Corrosion Resistance: Resists crevice corrosion, pitting and stress corrosion in seawater, acids and alkalis.
• High Strength and Durability: Maintains integrity under high loads and extreme stress.
• Outstanding High-Temperature Performance: Operates reliably at temperatures up to 1000 degrees Celsius.
• Versatility: Applicable in marine, chemical, oil and gas, and aerospace industries.
• Good Weldability and Fabrication: Machinable and weldable with no performance loss.
• Long Service Life: High oxidation resistance with excellent mechanical fatigue and thermal cycling performance.

How Do Inconel 625 Fasteners Perform Under High-Stress Conditions?

UNS N06625 Fasteners maintain high mechanical performance under high stress, elevated temperatures and corrosive conditions. The niobium and molybdenum content of the alloy provide:

• Excellent creep resistance
• High fatigue strength
• Resistance to stress corrosion cracking

Inconel 625 Bolts, Alloy 625 Nuts and Socket Head Cap Screws are therefore ideal in pressure vessels, heat exchangers, turbines and offshore platforms where long-term reliability and dimensional stability are critical.

What Is the Difference Between Inconel 625 Fasteners and 825 Fasteners?

Even though both alloys are nickel-based and offer strong corrosion resistance, they differ in composition and performance. For a detailed comparison, read our blog on Inconel 625 vs Incoloy 825.

Inconel 625 vs Incoloy 825

Inconel 625 Fasteners Standards and Specifications: ASTM F467, ASTM F468 and ASTM B446

Inconel 625 fasteners are manufactured in accordance with ASTM F467, ASTM F468 and ASTM B446 standards to deliver high strength, corrosion resistance and dependable service. Their sizes and tolerances conform to global standards ensuring consistency, durability and easy fitting in the most demanding industrial applications.

Inconel 625 Fasteners Specification Table

Chemical Composition of Inconel 625 Fasteners (%)

Equivalent Grades

Mechanical Properties of Inconel 625 Fasteners

Physical Properties of Inconel 625 Fasteners

Available Types of Inconel 625 Fasteners

Kalpataru Piping Solutions stocks a full range of Inconel 625 fasteners in various forms, configurations and sizes to suit marine, chemical, petrochemical, aerospace and high-temperature applications. Each product type has a dedicated section below with focused specifications.

Inconel 625 Bolts: Hex Bolts, Heavy Hex Bolts and Stud Bolts

Inconel 625 bolts are available in hex, heavy hex, square, eye, flange, carriage, lag and stud bolt configurations in UNS N06625 material to ASTM F468. We supply Inconel 625 bolts from M12 to M100 (metric) and 1/4 inch to 4 inch (imperial) with UNC, UNF and ISO metric thread options. Whether you need Inconel 625 hex bolts for high-pressure flanged joints or stud bolts for heat exchanger assemblies, our stock covers all standard sizes with EN 10204 3.1 MTC on every order.

• Hex Bolts
• Heavy Hex Bolts
• Square Bolts
• Eye Bolts and U-Bolts
• Flange Bolts
• Carriage Bolts
• Lag Bolts
• Stud Bolts

Inconel 625 Nuts: Hex Nuts, Heavy Hex Nuts and Coupling Nuts

Inconel 625 nuts are stocked in hex, heavy hex, coupling, lock, nyloc, wing and cap configurations in UNS N06625 material to ASTM F467. Inconel 625 hex nuts are available from M12 to M72 with full traceability and EN 10204 3.1 MTC on every shipment. Our Inconel 625 heavy hex nuts and coupling nuts are widely used in offshore, chemical processing and power generation applications where standard hex nut dimensions are insufficient for the design load.

• Hex Nuts
• Heavy Hex Nuts
• Square Nuts
• Coupling Nuts
• Lock Nuts and Nyloc Nuts
• Wing Nuts
• Cap Nuts and Acorn Nuts
• T-Nuts and Panel Nuts

Inconel 625 Studs and Threaded Rods: Threaded Stud Manufacturer

As an Inconel 625 threaded stud manufacturer and Inconel 625 threaded rod manufacturer in India, Kalpataru Piping Solutions produces fully threaded and double-end studs from M12 to M72 and threaded rods from 3 mm to 200 mm length to ASTM F467 and ASTM F468 standards. Each Inconel 625 threaded stud is manufactured with full traceability to coarse and fine thread options per ASME B18.31 and DIN 976. Our Inconel 625 threaded rod supply covers metric and imperial thread forms for chemical plant, power generation and offshore bolting assemblies.

• Fully Threaded Studs
• Double-End Studs
• Stud Bolts

Inconel 625 Screws and Washers

Inconel 625 screws are available in socket head cap, hex cap, socket set, machine, self-tapping and self-drilling configurations. Inconel 625 washers are available in flat, spring and fender forms from M12 to M72 in UNS N06625 material. They are widely used in marine, offshore and chemical flange assemblies where standard carbon steel washers would corrode rapidly.

• Socket Head Cap Screws
• Hex Cap Screws
• Socket Set Screws
• Machine Screws
• Self-Tapping and Self-Drilling Screws
• Flat Washers
• Spring Washers
• Fender Washers

Size Range and Dimensions for Inconel 625 Fasteners

Alloy 625 Fasteners Metric Sizes

Imperial sizes available: 1/4 inch to 4 inch diameter on request per ASME B18.2.1. Please specify imperial sizing requirement when placing your inquiry.

Manufacturing Standards and Thread Types: Inconel 625 Fasteners

We adhere to ASTM, ASME, DIN, ISO and ANSI requirements for chemical composition, mechanical characteristics and dimensional accuracy. Our fasteners are available in coarse and fine thread classes with metric and imperial variants to ensure compatibility and high load performance.

Inconel 625 Fasteners: Standards and Thread Types Table

Inconel 625 Fasteners Manufacturing Process

• Cold Forging: Shaping fasteners at room temperature enhancing strength and surface finish.
• Hot Forging: Forming intricate shapes at high temperatures without loss of toughness.
• Machining: Providing accurate dimensions in bolts, nuts, screws and studs.
• Thread Forming: Manufacturing powerful, precise threads via rolling or cutting.
• Cold Forming of Nuts: Producing high-strength nuts with improved grain structure.
• Heat and Surface Treatment: Improving mechanical properties and corrosion resistance.

Applications of Inconel 625 Fasteners

Inconel 625 fasteners are widely used in industries that demand high strength, corrosion resistance and performance in extreme environments. Key application areas include:

• Petrochemical Industry: Hot and corrosive chemical processing equipment where standard alloys fail.
• Automotive and Motor Sport: Exhaust studs, turbocharger fasteners and high-temperature engine components subjected to extreme thermal cycling.
• Oil and Gas Industries: Refinery equipment, offshore rigs, subsea pipelines and sour service applications to NACE MR0175.
•  Power Generation: High-temperature machinery, boilers and turbines requiring creep resistance.
• Marine and Seawater Equipment: Marine pumps, desalination plants and valves in seawater and saline environments.
• Electrical Applications: Electrical enclosures, cables and power connectors in corrosive industrial settings.
• Aerospace and Defence: Aircraft structural components, gas turbine engines and high-performance engineering assemblies.
• Construction: Structural fasteners in corrosive or high-temperature environments such as chemical plants and smelters.
• Heat Exchangers: High-performance fasteners for thermal equipment operating in extreme process conditions.

For matching Inconel 625 Pipes and Tubes to complement your fastener assemblies, see our pipe supply page. Complete your bolting assembly with Inconel 625 Flanges for full flange joint solutions. Our fasteners are machined from ASTM B446 bar stock; see our Inconel 625 Round Bars page for raw material supply.

Inconel 625 Fasteners Price Chart: Kalpataru Piping Solutions

Kalpataru Piping Solutions supplies Inconel 625 fasteners at competitive, industry-standard prices. We stock Alloy 625 bolts, nuts, washers, screws and studs for extreme temperature and corrosion-prone applications. Prices vary depending on size, type and individual requirements. USD per unit pricing is also available for international export buyers on request.

Estimated Inconel 625 Fasteners Price

Marking and Packing for Inconel 625 Fasteners

Kalpataru Piping Solutions ensures that its fasteners are always properly packed in order to avoid damaging the Inconel 625 fasteners during transportation and handling. Export shipments are loaded into wooden boxes, pallets or crates that are fumigated and lined with moisture-shield. All fasteners are marked with visible marks such as Grade (UNS N06625), Size, Heat/Batch Number, Lot Number and Manufacturer Identification. On-demand marking and packaging: OEM and project-based marking and packaging needs can be accommodated.

Quality Assurance and Testing

Our fasteners of Inconel 625 are manufactured with high quality control mechanism. Each step in the process, starting with the selection of the raw materials up to the final inspection are verified to meet the international standards such as ASTM, ASME, DIN, EN, ISO and BS. Dimensional checks, corrosion resistance tests, surface tests and hardness tests are all done. Third-party inspection companies such as TUV, BV, SGS and DNV can be engaged to perform product verification, documentation and approval of compliance in the project. Chemical and mechanical testing are done in independent laboratories approved by NABL to have complete traceability and accuracy of test results.

Test Certificates Provided

Kalpataru Piping Solutions provides a complete set of test certificates to verify the authenticity and performance of materials, including:

• Manufacturer Test Certificate (MTC) to EN 10204 3.1 and 3.2
• Raw Material Certificate and Mill Certificate
• Heat Treatment Report
• Hardness and Mechanical Test Report
• Chemical Composition Report
• PMI Test Report (Positive Material Identification)
• NACE MR0103 / MR0175 Compliance (where required for sour service applications)
• Non-Destructive Test (NDT) Reports including Radiography
• Third-Party Inspection (TPI) Reports

Weight Charts for Inconel 625 Fasteners

Note: All fractional inch sizes in the hex nut weight chart below have been corrected to standard notation (e.g., 1/2 inch, 5/8 inch, 3/4 inch, 7/8 inch). Weight values are provided as a reference guide and should be verified with a fastener technical engineer for critical procurement applications. Units are grams per piece.

Inconel 625 Hex Nut Weight Chart (Corrected)

Inconel 625 Bolts Weight Chart

Inconel 625 Nut Weight Chart

Torque Specifications Chart for Inconel 625 Bolts

Dimensional Charts and Specifications

Dimensions of Nickel 625 Threaded Rod

Inconel 625 Bolts Dimensions Chart (Hex Bolts: ISO 4014 / DIN 931)

Inconel 625 Nuts Dimensions (Hex Nuts: ISO 4032 / DIN 934)

Inconel 625 Washer Dimensions (Flat Washers: DIN 125 / ISO 7089)

Frequently Asked Questions