Aluminium, ASTM & FED-QQQQ-A-225/8 T651 (6061) Bar & Extrusion

Medium strength aerospace aluminium alloy.

A widely used aerospace aluminium alloy of medium strength. Depending upon the specific temper, QQ-A-225/8 can have a tensile strength of 290 MPa (42 ksi) and yield strength up to 240 MPa (35 ksi).

This alloy is suitable for a range of applications where strength is needed while still allowing good weldability and workability. Like all aluminium alloys, QQ-A-225/8 T651 has exceptional resistance to corrosion.

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Related Specifications

Aluminium alloy QQ-A-225/8 has similarities to the following standard designations and specifications but may not be a direct equivalent:

  • AMS 4113
  • AMS 4115
  • Alloy 6061
  • UNS A96061

Temper Types

Alloy QQ-A-225/8 is supplied in a wide range of tempers:

  • T42
  • T451
  • T62
  • T4
  • T651
  • O
  • T6


Chemical Composition


  • Aerospace components
  • Defence components
  • High technology applications


  • Very good machinability
  • Very good weldability using inert gas, resistance, spot or beam welding. Other welding methods are not recommended.
  • Good resistance to atmospheric corrosion

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