Cupro-Nickel Fasteners are hardware components made from copper-nickel alloys that offer a combination of copper and nickel in varying proportions. The most common grades used for Cupro-Nickel Fasteners are Copper-Nickel 70/30 (C71500) and Copper-Nickel 90/10 (C70600), containing 70% copper and 30% nickel, and 90% copper and 10% nickel, respectively. These alloys also include trace amounts of other elements like iron, manganese, and sometimes small additions of other elements to enhance specific properties.

One of the key features of Cupro-Nickel Fasteners is their exceptional resistance to seawater corrosion and biofouling. These alloys are widely used in marine environments due to their ability to withstand the harsh conditions encountered in seawater. They exhibit superior resistance to marine organisms, chloride-induced corrosion, and erosion, making them ideal for shipbuilding, offshore structures, and seawater-cooled systems.

Cupro Nickel Fasteners, Copper Nickel Alloy Fasteners, CuNi Fasteners, Cuppro Nickel Round Head Bolts, Copper Nickel Fasteners, Cupro Nickel Fasteners Manufacturers in India.

Cupro Nickel Fasteners
  • Standard

    B 18.2.4, B 28.2.4, B16.5


    ASTM B151, ASME SB151


Another significant feature of Cupro-Nickel Fasteners is their excellent mechanical properties. Depending on the specific grade, these alloys offer a good balance of strength and ductility, making them easy to fabricate, form, and weld. Their high strength allows Cupro-Nickel Fasteners to withstand mechanical stresses and loads encountered in various marine and industrial applications.

Corrosion resistance is a vital quality of Cupro-Nickel Fasteners. The formation of a protective oxide layer in seawater enhances their resistance to corrosion and minimizes the risk of galvanic corrosion when in contact with other metals. This makes them an excellent choice for fastening critical components in marine environments, including propellers, heat exchangers, condensers, and other equipment.

Copper Nickel Tab Washer, Cupro Nickel T Nuts, CuNi Carriage Bolts, ASME SB151 Cupro Nickel Hex Nuts, CuNi Plain Washer, Cupro Nickel Rivet Nuts, Cupro Nickel Fasteners Manufacturers in India.

fevicon-logo Cupro Nickel Bolts and Nuts Specification

Specifications ASTM B151, ASME SB151
Standard DIN, ASTM, BS and all International Standards
Size M3 to M90
Length 10mm to 1000mm
Dimensions DIN 931, 933, 934, 7991, 976, 125, ASME B18.2.1, B18.3
Threads available UNF, BSW, BSF, METRIC, UNC, or as required
Threads Configuration ASME B1.1 2A/3A – 2B/3B Inch Unified Threads and B1.13M 6h-6G Metric Coarse Threads
Form Hex, Threading, Square, Round as per Gauge Etc.
Head Hex, Square, Round, Hex flange, Flat, T-head & Triangular etc.
Neck type Hex, Square, Triangular, Oval & Knurled etc.
Surface Coating Black Oxide, Cadmium, Galvanized, Teflon, Xylan, Zinc, Others Upon Request
Manufacturing Process Wire Drawing, Cold Heading, Insert tapping, Heat Treatment, Surface Plating, Inspection, Packing.

Cupro-Nickel Fasteners find extensive applications in marine and offshore industries, where their corrosion resistance and mechanical properties are essential for reliable performance. They are used in shipbuilding, desalination plants, offshore oil and gas platforms, and seawater-cooled power generation facilities. Additionally, these fasteners are employed in chemical processing plants, where their resistance to corrosive chemicals and high-temperature performance are valued. Their versatility, durability, and resistance to seawater corrosion make them suitable for various industrial and marine applications, where reliable fastening solutions are necessary to ensure long-lasting performance in challenging environments.

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fevicon-logo Types of Cupro Nickel Fasteners


Cupro Nickel Nuts


CuNi 70-30 Bolt


Cupro Nickel Washer

Stud Bolts

70-30 Cu-Ni Stud Bolts

Hex Bolt

Cupro Nickel Alloy Hex Bolt

Threaded Rod

Cupro Nickel Threaded Rod

Anchor Bolt

Copper Nickel Anchor Bolt

Spring Washer

Cupro Nickel Spring Washer

Fasteners Manufacturers In India

  • Hardness testing to ISO 6508-1

  • Nut proof load testing to ISO 898-2

  • Suitability for preloading to EN 14399-2

  • Calibrated gauges and tools

fevicon-logo Other Types Of Cupro Nickel Fastener

Copper Nickel Bolts Cupro Nickel Hex Bolt
Copper Nickel Hex Bolt Copper Nickel Alloy Fasteners
Copper Nickel Stud Bolts Cupro Nickel Copper Nickel Threaded Rod
Copper Nickel Spring Washer Cu Ni Fasteners
Copper Nickel Fasteners Cupro Nickel (Cu-Ni) Fasteners
Cu-Ni Spring Washers ASTM B151 Cupro Nickel Hex Bolt

fevicon-logo Cupro Nickel Fastener Application Industries

Aerospace Industry
Nuclear Industry
MEdical Industry
Marine Industry
Mining Industry
Automotive Industry
Construction Industry
Manufacturing Industry
Nut Bolt