About Smiths

We are a world-class supplier of engineering raw materials. Our objective is to provide all our customers, from the small machine shop to the large multi-national corporation, a supply path that continuously delivers the highest levels of service, quality and value.

PB104 (CW453K)

Phosphor Bronze Alloy

PB104 Phosphor Bronze

PB104 is a high performance wrought phosphor bronze generally used in more demanding applications. Like PB102 it offers superb spring qualities as well as high corrosion resistance that are close to that of aluminium bronzes in a range of atmospheric conditions. Its 8% tin content gives this bronze exceptional wear and bearing properties and offers a good cold formability rating.


PB104 offers excellent wear resistance with good spring properties. The alloy has good cold forming and very high mechanical properties with good resistance to shock loading

Typical Applications

Commercial applications for this engineering material include:

  • High-performance gears
  • Aerospace & marine fasteners
  • Shafts & spindles
  • Bearing components
  • Pump components
  • Thrust washers
  • Nuts & bolts
  • Engine valve guides

We stock PB104 in round bar.

Technical Assistance

Our knowledgeable staff and resident metallurgists will be pleased to assist you further on any technical topic. Smiths Metal Centres Limited also boasts an in-house UKAS Accredited Testing Laboratory which is unique within the multi-metal and plastic stockholding sector. We believe this underlines our total commitment to quality and our ethos of being the complete service provider.

Additional Info

A technical datasheet for PB104 is available in PDF file format. To view and download, please click here.

We offer in-house processing options - for more information, please refer to our processing services.

Read our corporate brochure by clicking here.

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