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.

SigmaBronze 12

Phosphor Bronze Alloy

SigmaBronze 12 ™ Phosphor Bronze

SigmaBronze 12 is a continuously cast copper based alloy containing 10.5 - 13% tin. This alloy combines high mechanical strength and hardness with good ductility, corrosion resistance and wear resistance.

SigmaBronze 12 can be used as an alternative to PB1 or PB2 in many applications. It has the advantage of a higher tin content that will give a degree of self-lubrication as well as being available in a range of metric sizes.


SigmaBronze 12 offers high mechanical and fatigue strength with excellent corrosion resistance in seawater. The alloy has increased tin content which gives the material a degree of self-lubrication. With good resistance to impact loading and high wear resistance, SigmaBronze 12 provides good machinability and is weldable and brazable.

Typical Applications

Commercial applications for this engineering material include:

  • Pump & valve components
  • Marine ultrasonics
  • Worms & gears under high working loads
  • Excavation & cranes
  • Bearings & bushes
  • Linear bearings
  • Flanges

We stock SigmaBronze 12 ™ in flats, round bar, plate and hollow 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 SigmaBronze 12 ™ 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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