Copper Alloys, Phosphor & Leaded BronzeCW451K (PB102) Bar & Sheet

Most widely used grade of wrought phosphor bronze for an extensive range of general purpose applications.

CW451K/PB102 is the most widely used wrought phosphor bronze in the UK. It contains additions of 5% tin and up to 0.4% phosphorus to enhance its wear resistance, mechanical strength and stiffness and corrosion resistance.

The 5% tin containing alloy offers superb spring qualities, a high fatigue resistance, excellent cold forming properties and a corrosion resistance almost equivalent to aluminium bronzes in many atmospheric conditions.

PB102/CW451K also offers a reasonable machinability (20-25% that of free machining brass =100%), with an excellent soldering, brazing and butt welding capability. It can also be joined reasonably easily using spot welding and gas shielded arc welding, seam welding and coated metal arc welding.

PB102/CW451K is an extremely versatile alloy which can be used across a wide range of general engineering applications.

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Product FormSize Range
Round Bar532" - 4 12" diameter
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Related Specifications

CW451K/PB102 bronze corresponds to the following designations but may not be a direct equivalent:

  • UNS C51000
  • ISO CuSn5


Chemical Composition


  • Gears
  • Connectors & switches
  • Bushes & bearings
  • Marine applications
  • Aircraft applications
  • Chemical applications
  • Springs
  • Architectural & decoratve components


  • Good mechanical properties
  • Excellent cold forming properties
  • High wear resistance
  • Very good corrosion resistance
  • Easily joined by brazing and welding
  • Low coefficient of friction
  • Good spring properties

Additional Information


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