Copper Alloys, Aluminium BronzeBSB 25 DTD498 Bar & Forgings

A copper bronze alloy containing nickel and silicon for very high integrity components.

DTD498 is a copper-nickel-silicon alloy that is a UK MOD specification designed for aerospace applications. This alloy provides a combination of high mechanical strength and notch ductility whilst still able to possess superior electrical and thermal conductivities.

It has excellent bearing properties, resistance to corrosion and hydrogen embrittlement and low magnetic permeability and is used for very high integrity components.

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Related Specifications

  • BS B25
  • BS 2B 25
  • BS 3B 25
  • C18000
  • C64700
  • CW111C
  • CuNi2Si


Chemical Composition


  • Offshore & marine: Non-magnetic naval architecture and high strength fasteners (non-magnetic and cryogenic)
  • Aerospace: Bearing cages, aircraft undercarriage components, fasteners and bearings
  • Industrial: Fasteners, engine valve guides and seats, pump and valve components, high performance bearings, bushes, gears safety tools, mechanical seals, electrical contacts, resistance welding electrodes and brake pads


  • Excellent electrical and thermal conductivity
  • Low magnetic permeability
  • Resistance to corrosion and hydrogen embrittlement
  • High mechanical strength
  • Good fatigue strength
  • Readily machinable
  • Good wear resistance
  • Good galling resistance

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