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Monel 400 Fasteners – Composition, Properties and Uses

Monel 400 fasteners

If you’re looking for a fastener that can withstand extreme conditions, Monel 400 should be at the top of your list. Monel 400 is a nickel-copper alloy with excellent resistance to corrosion and high-strength properties. It is widely used in marine, chemical, and hydrocarbon processing industries. This blog post will discuss everything you need to know about Monel 400 fasteners, including their composition, physical and mechanical properties, heat treatment, and corrosion resistance.


What are Monel 400 Fasteners?

Monel 400 Bolts are made from an alloy of nickel-copper and have excellent mechanical properties. These fasteners offer corrosion resistance in seawater and moderate strength and ductility at high temperatures. They are also resistant to a wide range of corrosive environments. Alloy 400 fasteners come in various sizes and shapes, making them highly versatile for various applications, including industrial equipment and marine structures.

Monel 400 Fasteners Composition

UNS N04400 is a nickel-copper alloy comprising 67% nickel, 23% copper, and small amounts of iron, manganese, and silicon. It is known for its corrosion resistance in various environments, such as saltwater, sulphuric acid, and hydrofluoric acid. The high nickel content provides exceptional resistance to caustic alkalies, while the copper content provides resistance to oxidizing agents. This composition makes Monel 400 ideal for marine and chemical processing applications.

Content (%)
Nickel, Ni
63.00 min
Silicon, Si
0.5 max
Carbon, C
0.3 max
Sulphur, S
Copper, Cu
Iron, Fe
2.5 max
Manganese, Mn
2 max

Monel 400 Fasteners Physical Properties

UNS N04400 Nuts has a specific gravity of 8.83 and a melting point of 1300-1390°C. Its excellent thermal conductivity makes it a common choice for heat exchangers and reactors. Monel 400 exhibits good ductility and can easily bend and form without cracking. It has a high thermal expansion coefficient, making it ideal for joining dissimilar metals.

Monel 400 Fasteners Mechanical Properties

The high mechanical properties of the Alloy 400 stud bolts make it a favourite choice for industrial applications. It has a tensile strength of 550-750 MPa and a yield strength of 240 MPa. Its elongation at break ranges from 40-50%, making it a great option for high-stress applications. The hardness of Monel 400 ranges from 15 to 30 Rockwell C, depending on the heat treatment.

Tensile strength(annealed)
517-620 MPa
75-90 ksi
Yield strength
172-345 MPa
25-50 ksi
Modulus of elasticity
179 GPa
26000 ksi
Poisson’s ratio

Monel 400 Fasteners Equivalent

Monel 400
NA 13
МНЖМц 28-2,5-1,5
NW 4400

Monel 400 Fasteners Uses

Monel 400 fasteners are used in various industrial applications, including marine, chemical, and hydrocarbon processing. They are popular in marine applications due to their excellent resistance to seawater corrosion and fouling. Monel 400 fasteners are used in chemical processing in pumps, valves, heat exchangers, and reactors. They are also prevalent in the hydrocarbon processing industry for their ability to withstand high-temperature and high-pressure conditions.

Monel 400 Fasteners Heat Treatment

2.4360 Monel 400 washer can be easily heat-treated to increase its hardness and strength. It can be annealed at 926°C, which softens the material and improves its ductility. Monel 400 can also be cold-worked, which increases its strength and hardness. However, cold working can reduce the material’s ductility, so it’s important to consider the application before cold working.

Monel 400 Fasteners Corrosion Resistance

One of the most significant advantages of monel 400 bolts and nuts is their excellent corrosion resistance. They are highly resistant to seawater, sulphuric acid, and hydrofluoric acid. Monel 400 can also withstand high-temperature and high-pressure environments, making it useful in various industrial applications. Its corrosion resistance ensures that it lasts longer, reducing the maintenance costs associated with equipment failure



Monel 400 Nuts and Bolts is an exceptional material choice for fasteners due to its excellent combination of physical and mechanical properties, corrosion resistance, and heat treatment capabilities. Its composition, physical and mechanical properties make it ideal for industrial applications like marine, chemical, and hydrocarbon processing. Its corrosion resistance ensures that equipment lasts longer, reducing costs associated with equipment failure. If you’re in the market for a fastener that can withstand extreme conditions, consider Monel 400.

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