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SigmaChip A2 Commercial Aluminium AlloySigmaChip A2

Free Machining Aluminium Alloy

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

SigmaChip A2 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 has exceptional machinability for an aluminium alloy, with far superior machinability 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.

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.

Download SigmaChip A2 Datasheet

Typical Applications:

  • Repetition and engineering components
  • Gears, Valve blocks, Spindles
  • Shafts, Nozzles, Cable glands
  • Pipe unions, Threaded items, Studding
  • Turned parts, Plumbing, Pneumatics
  • Hydraulics, Pins, Decorative

We offer SigmaChip A2 commercial aluminium alloy from ex-stock in round bar.


Every Smiths Metal Centre has at least one automatic power bandsaw for immediate requirements and has access within the Smiths group to thirty power saws including a fully automated magazine feed CNC rod blanking line. We can economically cut from one off blanks to the largest production run – for immediate or JIT deliveries.

Pick a Product

To find out more about Smiths Metal Centres own range of commercial aluminium alloys, click on one of our products on the side menu of this web page.

Have a question or need a detailed quote?

Our staff are ready to take your call. For all supply and technical enquiries call us today
on 0845 527 3331 or click here to contact us.