Copper Alloys, Aluminium BronzeAMS 4640 (C63000) Bar & Forgings

American nickel aluminium bronze grade designed as an equivalent to European grades.

AMS4640/C63000 is perhaps the most common of the American grades of nickel aluminium bronze. Containing aluminium (10%), nickel (5%) and iron (3%), with copper making up the balance, AMS4640/C63000 alloy demonstrates an exceptional balance of high strength and high hardness with excellent resistance to abrasion and wear. AMS4640/C63000 is also spark resistant, making it widely used in environments where DSEAR applies.

AMS464/C63000 also offers a very good corrosion, erosion and cavitation resistance in seawater and brackish water together with a good resistance to dilute sulphuric, hydrochloric and non-oxidising acids. It also has a very good galling resistance and also offers a high retention of mechanical properties at elevated temperatures.

AMS4640 is available in rod and forged form.

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Related Specifications

  • AMS 4625
  • UNS C63000
  • ASTM B150


Chemical Composition


  • Marine fasteners, hardware and fittings
  • Aerospace landing gear components, thrust washers, gears, control bushes, faucet balls, springs & worm wheels
  • Non-sparking safety tools
  • Valve stems and seats
  • Wear plates
  • Welding clamps
  • Valve spindles and components
  • Fasteners
  • Bearing bushes


  • Very good strength and toughness
  • High resistance to corrosion and erosion
  • Retention of properties at cryogenic temperatures
  • Excellent resistance to shock, wear and abrasion
  • Spark resistance
  • Good fabrication and welding properties
  • Anti-galling

Additional Information

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