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.

Sigmachip A2 ™

Commercial Aluminium

SigmaChip A2 ™ Commercial Aluminium Alloy

SigmaChip A2™ is a high-performance free machining aluminium alloy engineered for economical production of repetition components, whilst giving superior tool life and component quality, together with high mechanical properties.

Derivative Alloy

The product is a Smiths designated material and is a sophisticated 2011 T3/T6 derivative alloy made to the most exacting quality standards required for consistency of machinability and surface finish. ISO designation AICu5.5 PbBi.


SigmaChip A2™ offers exceptional machinability for an aluminium alloy. The product provides superior machinability when compared to all-purpose grades such as 6082 (H30). Easy to machine on any equipment, SigmaChip A2™ produces excellent tolerances and surface finish with very low tool wear.

Characteristic ‘needle’ chips are produced, which are very easily cleared from the work area. Coolant is rarely required for roughing operations, but emulsion or cutting oil may be beneficial when finishing to provide cooling and inhibit edge build-up.

Typical Applications

Commercial applications for this engineering material include:

  • Gears, valve blocks, spindles
  • Shafts, nozzles, cable glands
  • Pipe unions, threaded items, studding
  • Turned parts, plumbing, pneumatics
  • Hydraulic equipment

We stock SigmaChip A2 ™ in flats, round bar, round tube, square bar and hexagon 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 SigmaChip A2 ™ 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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