CM2837 Nickel Aluminum Bronze (AMS 4640)

Catalog No. CM2837
Molecular Formula Cu-Al-Ni-Fe
Appearance Light Bronze Bar/Plate
Hardness 180-240



Nickel Aluminum Bronze (AMS 4640) Description

Nickel Aluminum Bronze (AMS 4640)Nickel Aluminum Bronzes have been adapted with time to optimize performance and can provide a combination of properties that can offer an economic alternative to other types of alloy systems. Nickel Aluminum Bronzes are available in both cast and wrought product forms and have a unique combination of properties such as excellent wear and galling resistance, high corrosion resistance, high strength, density (10% lighter than steel), low magnetic permeability (of 

Nickel Aluminum Bronze (AMS 4640) Specifications

Size (Solid Bar) 3/8” – 15” diameter
Size (Hex & Square Bar) Customizable
Size (Plate) Cut to size, up to 6” thick

ASTM B-150-12, ASTM B-124, ASTM B-171, ASTM B-283, AMS 4640 G, SAE J463, QQ-C-465 B, ASME SB150


AMS 4880

Ingot ASTM B30
Precision ASTM B806
Sand ASTM B148, B763, SAE J461, J462



Nickel Aluminum Bronze (AMS 4640) Applications

There is a large market for Nickel Aluminum Bronze (AMS 4640) in naval applications, particularly for the submarine fleets of the world. The main applications are in seawater piping and valve systems, weapons handling, flexible couplings, sonar equipment, seawater external hatches, hydraulic valves and bearings, fasteners and sealing flanges, low noise propellers, propulsion equipment as well as periscope assemblies. These applications make use of some of the important properties of nickel aluminum bronzes: good corrosion resistance, non-sparking, wear resistance, high strength, and good impact properties.

The alloys also exhibit good anti-damping properties, twice that of steel, which is important for submarines in suppressing sound for silent operations. Non-sparking and wear resistance become particularly important in weapons’ handling systems. The various grades with lower iron and nickel contents can be manufactured with magnetic permeability below 1.03 µ.

Nickel Aluminum Bronze (AMS 4640) Packaging

Our Nickel Aluminum Bronze (AMS 4640) is carefully handled during storage and transportation to preserve the quality of our product in its original condition.


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