Strength in numbers

Aluminium Alloy   |   ASTM & FED-QQ

QQ-A-225/8 T651 Bar

AerospaceQQ-A-225/8 T651 Commercial6061

A medium strength aerospace aluminium alloy with, depending upon temper, Yield Strength of up to 35 ksi (240 MPa) and Tensile Strength of 42 ksi (290 MPa).
This alloy is selected where a combination of strength, weldability and workability are required.

Chemical Composition

SAE AMS QQ-A-225/8
Alloy QQ A 225/8
Chemical Element % Present
Aluminium (Al) balance
Other (Each) 0.05 max
Manganese (Mn) 0.15 max
Titanium (Ti) 0.15 max
Others (Total) 0.15 max
Zinc (Zn) 0.25 max
Chromium (Cr) 0.04 - 0.35
Copper (Cu) 0.15 - 0.4
Iron (Fe) 0.7 max
Silicon (Si) 0.4 - 0.8
Magnesium (Mg) 0.8 - 1.2

Alloy Designations

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:

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

Supplied Forms

Alloy QQ-A-225/8 is supplied in bar, rod, wire, tube and extruded sections:

  • Bar
  • Extrusions

Generic Physical Properties

Physical Property Value
Density 2.70 g/cm³
Melting Point 650 °C
Thermal Expansion 23.4 x10^-6 /K
Modulus of Elasticity 70 GPa
Thermal Conductivity 166 W/m.K
Electrical Resistivity 0.040 x10^-6 Ω .m
'Typical' Physical Properties are given

Mechanical Properties

SAE AMS QQ-A-225/8
Bar - 12.7mm to 203.2mm
Mechanical Property Value
Proof Stress 241 Min MPa
Tensile Strength 290 Min MPa
Elongation A50 mm 10 Min %

Thes Mechanical Properties apply to Bar in diameters 12.7mm to 203mm in the T651 temper