For over a century, AMPCO METAL has pioneered and produced the best metal solutions for the world’s products, applications and industries.

AMS Alloys

AMS 4640

Extruded and Drawn Rods


  • Exceptional Mechanical Properties: The aluminum bronze exhibits mechanical properties that exceed those of standard nickel aluminum bronzes, making it a high-strength alloy with superior performance characteristics.
  • Spark Resistant Properties: The alloy’s spark-resistant properties make it a safe choice for applications in explosive environments, ensuring the safety of both equipment and personnel.
  • Ideal for Wear Resistance: This AMS alloy excels in special conditions such as heavy loads, high friction, abrasive wear, and corrosive environments, making it a versatile and reliable choice for demanding applications.
  • Versatile Applications: AMS 4640’s versatility is evident in a variety of industries due to its outstanding properties.
Properties and Specifications

AMS 4640 is an exceptional high-strength aluminum bronze alloy with mechanical properties that exceed those of typical nickel aluminum bronzes. This superiority is due to its unique manufacturing process. This alloy is well-suited for heavy-duty applications and excels under conditions of high load, friction, abrasive wear, and corrosion. This AMS bronze is also spark-resistant, making it a safe choice for applications in potentially explosive environments. This alloy meets the stringent specifications of AMS 4640, ensuring reliable performance in a range of demanding mechanical and corrosive scenarios.


AMS 4640 is used in a wide range of demanding applications. This high-strength aluminum bronze alloy is ideally suited for heavy-duty, high-stress mechanical and corrosive scenarios. Its exceptional properties make it a top choice for applications involving abrasive wear, friction, deformation, and chemical erosion. Common applications include aircraft bearings and bushings, pump and marine shafts and wear rings, valve spindles and seats, and machine tool components. In addition, its spark-resistant properties make it a reliable option for safety tools and machine tool components used in explosive environments. The alloy’s versatility and durability make it a valuable choice in a variety of industries.

Best used

For heavy loads, friction, abrasive wear and corrosion.

Ideally suited for

Aircraft bearings / bushings, pump and marine shafts and wear rings, valve spindles and seats, machine tool parts.

Document Downloads

AMS 4640 EX E 1403A
AMPCO® Special Alloys Application

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