Copper Alloys, Aluminium BronzeAMS 4881 (C99520) Bar & Tube

A nickel alumimium bronze and one of the highest strength aluminium bronzes available.

An additional heat treating process is applied to AMS 4881, improving mechanical properties and the strength to weight ratio. This exceeds the range of typical aluminum bronzes.

UNS C99520 is commonly used in applications involving heavy loads abrasion, friction, and deformation at high temperatures. UNS C99520 can replace UNS C63020 with the advantage of this material being available in tube form.

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Range Enquiry

To enquire about our range or your specific requirements, please contact your local service centre.

Related Specifications

  • EN1982: 1998-11
  • CuAl10Fe5Ni5-B/CB333G


Chemical Composition


  • Aerospace landing gear bushes and bearings
  • Well head components
  • Bearings
  • Hydraulic bushes
  • Cryogenic applications
  • Pump parts
  • Worm gears
  • Propeller hubs


  • Very high strength
  • Good fatigue strength
  • Excellent corrosion resistance
  • Excellent wear resistance
  • Very high anti-galling properties gainst most grades of steels
  • Excellent machinability
  • Low friction properties

Find your local Service Centre

An extensive UK network of Service Centres, backed up by a central distribution facility.

  • Experienced multi-product specialists

  • In-house state of the art processing facilities

  • Large fleet of bespoke delivery vehicles

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