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Inconel 625 Fasteners

Inconel 625 Fasteners are manufactured from a nickel-chromium-molybdenum alloy known for its excellent corrosion resistance, high strength, and reliable performance in extreme environments. They retain their mechanical integrity when exposed to high temperatures, seawater, acids, chlorides, and high-pressure conditions.
With outstanding resistance to pitting, crevice corrosion, oxidation, and stress corrosion cracking, Inconel 625 bolts, nuts, screws, studs, and washers are widely used in chemical processing, oil and gas, marine engineering, aerospace, and power generation. Their durability and long service life make them ideal for critical fastening applications.

 

 

 

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Product Overview

Inconel 625 Fasteners for High-Performance Applications

Explore detailed information for this alloy product, including specifications, applications, supply options and quotation requirements.

Why buyers choose Inconel 625 Fasteners

Inconel 625 Fasteners are manufactured from a nickel-chromium-molybdenum alloy known for its excellent corrosion resistance, high strength, and reliable performance in extreme environments. They retain their mechanical integrity when exposed to high temperatures, seawater, acids, chlorides, and high-pressure conditions.
With outstanding resistance to pitting, crevice corrosion, oxidation, and stress corrosion cracking, Inconel 625 bolts, nuts, screws, studs, and washers are widely used in chemical processing, oil and gas, marine engineering, aerospace, and power generation. Their durability and long service life make them ideal for critical fastening applications.

 

 

 

Inconel 625 Fasteners
Pipe Specifications

Inconel 625 Fasteners size range and supply information

Specifications, available sizes and delivery conditions can vary by production route and order requirements. Contact us for current availability.

Item Typical Options Buyer Notes Typical Specification
Material Grade Inconel 625 / UNS N06625 / W.Nr. 2.4856 Confirm the alloy designation, chemical composition and certification requirements. Nickel-chromium-molybdenum alloy with excellent corrosion resistance
Fastener Type Hex bolts, heavy hex bolts, studs, threaded rods, nuts, washers or screws Specify the required fastener type, thread form and assembly configuration. Bolting assemblies available for high-temperature and corrosive service
Size & Thread Metric, UNC, UNF, BSW or custom thread Provide nominal diameter, thread pitch and required tolerances. Standard and custom sizes available according to drawings
Applicable Standard ASTM B446, ASTM B564, ASTM F468, ASME SB446 or project specification Confirm the required product and dimensional standard before ordering. ASTM / ASME standards available according to fastener type
Strength Grade Annealed, solution annealed, cold worked or custom strength condition Mechanical requirements should be matched to load, temperature and service conditions. High tensile strength with good fatigue and creep resistance
Surface Finish Plain, bright, pickled, passivated or coated Choose the finish based on corrosion exposure, installation and appearance requirements. Clean corrosion-resistant surface supplied as required
Nut & Washer Matching Matching Inconel 625 nuts and washers or compatible nickel alloy combinations Use compatible materials to reduce galling and galvanic corrosion during assembly. Matched fastener sets available for reliable installation
Inspection & Certification MTC, PMI, tensile test, hardness test, dimensional inspection and third-party inspection Confirm documentation, testing scope and traceability requirements before quotation. EN 10204 3.1 certificate and full lot traceability available

 

 

 

Standards

Common standards for Inconel 625 Fasteners

The final standard should follow the purchase order, engineering specification or project drawing.

Product Type Common Standards Typical Use Inspection Notes
Inconel 625 Bolts ASTM F468, ASTM B446 / ASME SB446 Offshore equipment, chemical processing systems and high-temperature assemblies Verify thread dimensions, tensile properties, PMI, surface condition and heat traceability.
Inconel 625 Stud Bolts ASTM F468, ASTM B446 / ASME SB446, ASME B1.1 Flanged joints, pressure vessels, valves and corrosion-resistant piping systems Check thread fit, overall length, mechanical properties, PMI and material certificates.
Inconel 625 Nuts ASTM F467, ASTM B446 / ASME SB446, ASME B18.2.2 Matching nuts for nickel-alloy bolts and studs in corrosive or elevated-temperature service Confirm thread compatibility, proof load or hardness, dimensions and material traceability.
Inconel 625 Screws ASTM F468, ASME B18 Series, project specifications Marine equipment, aerospace assemblies, instrumentation and chemical processing components Inspect head geometry, drive condition, thread accuracy, mechanical properties and surface defects.
Inconel 625 Washers ASME B18.21.1, DIN 125 / ISO 7089, project specifications Load distribution and joint protection in seawater, sour-gas and chemical environments Verify outside diameter, inside diameter, thickness, flatness, PMI and surface condition.
Custom Inconel 625 Fasteners ASTM B446 / ASME SB446, ASTM F468 / F467, customer drawings Special connections for subsea, nuclear, aerospace and pollution-control equipment Review drawings, machining tolerances, NDT, mechanical testing, coating requirements and inspection certificates.

 

 

 

Chemical Composition

Inconel 625 Fasteners composition reference

Chemical composition is reported by heat on the material test certificate. Use the table below as a material-selection reference.

Element Symbol Typical Requirement Function
Nickel Ni 58.0 min Base element providing corrosion resistance, toughness, and thermal stability.
Chromium Cr 20.0-23.0 Provides oxidation resistance and protection in oxidizing environments.
Molybdenum Mo 8.0-10.0 Improves resistance to pitting, crevice corrosion, and reducing acids.
Niobium + Tantalum Nb + Ta 3.15-4.15 Provides solid-solution strengthening for reliable fastener performance.
Iron Fe 5.0 max Controlled balancing element in the nickel-based alloy.
Cobalt Co 1.0 max Controlled to maintain consistent mechanical and corrosion properties.
Carbon C 0.10 max Limited to preserve ductility, corrosion resistance, and fabrication performance.
Manganese Mn 0.50 max Acts as a deoxidizer during alloy production.
Silicon Si 0.50 max Controlled to maintain strength, ductility, and manufacturing quality.
Aluminum Al 0.40 max Supports oxidation resistance and alloy stability.
Titanium Ti 0.40 max Contributes to alloy stabilization and mechanical strength.
Phosphorus P 0.015 max Controlled impurity to preserve ductility and fastening reliability.
Sulfur S 0.015 max Controlled impurity to reduce brittleness and cracking risk.

 

 

 

Mechanical Properties

Mechanical Properties of Inconel 625 Fasteners

Mechanical properties vary by standard, pipe size, production route and heat treatment. Use the specified standard and MTC as the final acceptance basis.

Condition / Product Tensile Strength Yield Strength 0.2% Elongation Notes
Annealed Inconel 625 bolts / studs 827 MPa min reference 414 MPa min reference 30% min reference General reference condition for corrosion-resistant fasteners.
Cold-worked Inconel 625 bolts / studs By fastener class, diameter, and specification By fastener class, diameter, and specification Lower than annealed condition Cold working increases strength while reducing ductility.
Inconel 625 nuts Not normally specified Not normally specified Not normally specified Specify proof load, hardness, thread class, and mating fastener requirements.
Custom Inconel 625 fasteners By ASTM / ASME and purchase specification By ASTM / ASME and purchase specification By ASTM / ASME and purchase specification Confirm heat treatment, thread form, coating, inspection, and test requirements.

 

 

 

Values shown are reference data for product selection. Purchase orders should define the exact standard, condition, inspection scope and certificate requirement.

Quotation Checklist

Information to confirm for your order

Share your requirements, including material, size, quantity, and specifications, for a fast quotation.

Material

Grade name, UNS number, equivalent grade or project material code.

Pipe Size

OD / NPS, wall thickness or schedule, length, tolerance and quantity.

Standard

ASTM, ASME, EN, DIN, drawing or customer specification.

Condition

Seamless, welded, annealed, solution annealed, pickled or polished.

Inspection

MTC EN10204 3.1, PMI, UT / ET, hydrotest and dimensional report.

Delivery

Destination, packing requirement, shipping method and delivery deadline.

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FAQ

Frequently asked questions about Inconel 625 Fasteners

FAQ content helps cover buyer questions and supports SEO for long-tail product searches.

Inconel 625 Fasteners are used in marine, offshore, chemical processing, aerospace, power generation, heat exchanger and high-temperature applications requiring excellent corrosion resistance and strength.

Available products include bolts, nuts, screws, studs, washers, threaded rods, U-bolts and custom-made fasteners according to drawings or project specifications.

Common standards include ASTM F468 for non-ferrous alloy bolts, screws and studs, ASTM F467 for nuts, and ASME SF468 and ASME SF467 equivalents. DIN, ISO, ANSI and customer standards can also be supplied.

Yes. Inconel 625 Fasteners can be supplied with an EN10204 3.1 material certificate, heat number traceability, chemical analysis, mechanical test results and PMI inspection when required.

Inconel 625 Fasteners are available in solution-annealed or customized conditions with plain, passivated, polished, coated or other surface finishes according to application requirements.

Please provide the fastener type, Inconel grade, size, thread specification, length, quantity, standard, strength requirement, surface finish, certificate requirements and destination.

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