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.

AMS QQA 250/4

American Specification Aluminium

AMS QQA 250/4 Aluminium Alloy

AMS QQA 250/4 is supplied in bare sheet and plate form.


Due to the alloys good fatigue resistance, especially in thick plate form, the material is specified for use in the aerospace and military sector in fuselage applications in such areas as structures and wing tension members. With improved fracture toughness and fatigue crack growth, AMS QQA 250/4 continues to maintain strength characteristics. The alloy is available in a variety of tempers and cladding should be considered if corrosion resistance is required.


AMS QQA 250/4 offers high yield strength with good fatigue resistance and excellent toughness. The alloy is resistant to corrosive attack if cladded, and offers very good resistance to stress corrosion cracking in the T851 temper.

Typical Applications

Commercial applications for this engineering material include:

  • Fuselage applications
  • Aerospace Components
  • Aircraft structures
  • Wing skins
  • Scientific instruments
  • Truck wheels

We stock AMS QQA 250/4 in plate, sheet and strip.

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 AMS QQA 250/4 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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