Inconel® 825 Fasteners are corrosion-resistant, nickel-based alloys used in particularly demanding industrial and chemical applications. These alloys offer superior strength at elevated temperatures, making them especially suitable for high-temperature, corrosive environments like those in the aerospace and oil exploration industries. Unlike other types of corrosion-resistant fasteners, these components have much higher resistance to oxidation and carburization and greater tolerance against chloride stress cracking (CSC). For these reasons, Inconel 825 fasteners have become the choice material for many critical securement applications in extreme conditions.

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Incoloy 825 Fasteners: Composition, Properties, and Uses

Regarding demanding industrial applications, the right choice of fasteners is critical to ensure reliable and safe processes. Incoloy 825 Fasteners are popular for their robust and corrosion-resistant properties in high-temperature and chemical environments. This blog will examine the composition, properties, and uses of Incoloy 825 Fasteners.

What are Incoloy 825 Fasteners?

Incoloy 825 Fasteners are high-grade speciality fasteners made from Nickel, Chromium, Iron & Molybdenum alloys. They offer excellent corrosion resistance in various environments and are ideal for use in the oil and gas industries. Additionally, they can withstand extremely hot temperatures and provide great strength and durability, making them perfect for many other industrial applications

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Incoloy 825 Fasteners

Incoloy 825 Fasteners

Heating Treatment of Incoloy 825 Fasteners:

The heating treatment of Incoloy 825 Fasteners involves a series of operations such as annealing, ageing, and hardening. To reach the desired properties, the fasteners must be heated slowly at a temperature range of 1200-1450°F (650-790°C) for both annealing and stress relieving. For ageing, temperatures range from 600-800°F (315-427°C). Lastly, hardening is completed by quenching in water or oil before tempering at 550-750°F (288–399°C).

The corrosion resistance of Incoloy 825 Fasteners

Incoloy 825 Fasteners resist chloride pitting and corrosion cracking, offering superior protection against highly corrosive environments. They provide excellent sulfuric and phosphoric acid resistance and overall general corrosion resistance.

Composition of Incoloy 825 Fasteners:

Incoloy 825 is a nickel-iron-chromium alloy with molybdenum, copper, and titanium. The high nickel and chromium content provide excellent corrosion resistance to various sulfuric, phosphoric, and organic acids. Adding copper improves the resistance to reducing hydrochloric and phosphoric acid. Moreover, titanium strengthens its ability to resist welding heat-affected zones' intergranular corrosion.

Properties of Incoloy 825 Fasteners:

The unique combination of chemical elements in Incoloy 825 results in numerous beneficial properties. Incoloy 825 Fasteners have excellent resistance to corrosion and stress-corrosion cracking in various environments, including acids and chloride solutions. Incoloy 825 has exceptional mechanical properties, including high rupture strength, flexibility, and tensile strength. Furthermore, Incoloy 825 is non-magnetic, making it useful for applications where magnetic permeability is undesirable.

Incoloy 825 Square Washers, Incoloy 825 Half Threaded Stud Bolts, 825 Incoloy Head Cap Screws, Alloy 825 Anchor Bolts, Incoloy® Alloy 825 Flat Washer, Incoloy Alloy 825 J Bolts, Nickel Alloy 825 Hex Nuts Suppliers, Alloy 825 Fasteners Exporters.

Uses of Incoloy 825 Fasteners:

Incoloy 825 Fasteners are ideal for various industries, including chemical, petrochemical, and power generation. Due to their exceptional corrosion resistance and superior mechanical properties, they are used in pumps, valves, heat exchangers, and reactors. Moreover, Incoloy 825 Fasteners are useful in marine environments and desalination plants because of their resistance to saltwater corrosion.

Design Considerations for Incoloy 825 Fasteners:

While Incoloy 825 Fasteners are robust, their performance depends significantly on their quality and proper installation. Incoloy 825 Fasteners should be designed to handle the application's specific environmental and operational demands. Furthermore, Incoloy 825 Fasteners must be installed correctly, ensuring that the material's physical and chemical properties are maintained and the fasteners' torque is appropriately applied.

Incoloy 825 Fasteners Specification

Standard ASTM B425, ASME SB425

Dimensions ANSI B18.2.2, DIN 934,ISO 4032, BS1768, BS 1769

Incoloy 825 Fasteners Length 3 mm to 200 mm

Incoloy 825 Size M3 - M56 | 3/6" to 2" | Custom Sizes

Incoloy 825 Machine Screws Size M1.6 - M12

Grades Incoloy 825

Type Bolts, Nuts, Sockets, Screws, Screw, Studs, Socket Screw, Hex Set Screw, Cap Screw, Machine Screw, Pan Head Screw, Allen Cap screw, Socket Head Cap Screw, Wing Screw, Spring Washers, Washers, Studs, Marine Anchors, Anchors, Hexagon Nut, Nut, Hex Coupling Nut, Hex Nut, Square Nut, Hex Domed Cap Nuts, Hex Head Bolts, Stud Bolts, Socket Hexagon Head Screw,U- Bolts, Anchor Bolt, Mushroom Head Square Neck Bolts, J Bolts, Wing Screw, T-Head Bolts, Foundation Bolts, Eye Bolt,Structural Bolts.


Incoloy 825 Fasteners offer exceptional resistance to corrosion and are ideal for use in high-temperature and chemical environments. Their unique combination of elements provides superior mechanical properties, making them a top choice for chemical, petrochemical, power generation, and marine industries. Incoloy 825 Fasteners are robust and reliable but require proper design and installation to realize their potential. As with any high-performance fastener, choosing the correct type and ensuring the correct installation is essential for its maximum effectiveness.

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ASTM B425 Incoloy 825 Fasteners Equivalent Indian Standard

Incoloy 825 2.4858 N08825 NCF 825 NA 15 ЭИ670 Z8NC32-21 X10NiCrAlTi32-20

ASTM B425 Incoloy 825 Fasteners Chemical Composition

Grade Ni Fe Cr Cu Ti Al C Mn S Si
Incoloy 825 30.0-35.0 39.5 min 19.0-23.0 .75 max .15-.60 .15-.60 .1 max 1.5 max .015 max 1.0 max

ASME SB425 Incoloy 825 Fasteners Mechanical Properties

Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
7.94 g/cm3 1350-1400 ℃ Psi - 75,000 , MPa -520 Psi - 30,000 , MPa - 205 30 - 35 %

Other Types of Incoloy® 825 Fasteners

  • Incoloy 825 Screw
  • UNS N08825 Incoloy® Washers
  • ASTM B425 Incoloy 825 Square Nut
  • ASME SB425 Incoloy 825 Nut
  • ASTM B425 Incoloy® 825 Bolt

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