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5251 (NS4) Commercial Aluminium Alloy5251 (NS4) Aluminium Alloy

Commercial Aluminium Alloy

5251 (NS4) - an alloyed non-heat treatable rolled aluminium sheet designed for general sheet metal work where higher mechanical properties are required together with a degree of formability.

Internationally recognised grade EN AW 5251 H22 – AlMg2 hardened to the quarter-hard temper. The previous BS specification was known as NS4 H3. Our range of 5251 will meet all appropriate national / international standards.


The higher strength and extra hardness of grade 5251 over pure aluminium give improved machinability properties.

The machinability of the alloy for its intended application base is quite reasonable, if not as good as the heat-treated alloys, which are much harder combined with greatly reduced formability. We recommend aluminium geometry cutting tools running at a reasonable speed to avoid the edge build-up which can occur at lower cutting speeds.

High speed steel tools may be more economical than carbide, particularly with the possibility of a large rake angle on machines which cannot reach carbide cutting speeds.

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 5251 (NS4) Aluminium Alloy Datasheet

Typical Applications:

  • Higher strength sheet
  • Metal work
  • Packaging
  • Boiler making
  • Heat transfer devices
  • Chemical industry
  • Pharmaceutical
  • Architectural panelling
  • Welded structures
  • Offshore applications
  • Cabinets
  • Appliances
  • Pressure vessels
  • Panelling

We offer 5251 aluminium alloy in sheet.


Our processing department offers a comprehensive service including guillotining where your material can be cut to your exact size requirements.

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.