Aluminium Alloy - ASTM & FED-QQ - QQ-A-250/5 '0' Sheet

QQ-A-250/5 '0' Sheet

A medium to high strength alloy with, dependent upon temper, minimum Proof Stress up to 56 ksi / 385 Mpa and minimum Tensile Strength up to 64 ksi / 440 MPa

Chemical Composition

Spec: SAE AMS QQ A 250/5

Alloy QQ a 250/5

Chemical Element % Present
Silicon (Si) 0.0 - 0.50
Iron (Fe) 0.0 - 0.50
Copper (Cu) 3.80 - 4.90
Manganese (Mn) 0.30 - 0.90
Chromium (Cr) 0.0 - 0.10
Magnesium (Mg) 1.20 - 1.80
Zinc (Zn) 0.0 - 0.25
Titanium (Ti) 0.0 - 0.15
Titanium + Zirconium (Ti+Zr) 0.0 - 0.20
Other (Each) 0.0 - 0.05
Others (Total) 0.0 - 0.15
Aluminium (Al) Balance


Physical PropertyValue
Density 2.74 g/cm³
Melting Point 640 °C
Thermal Expansion 23.1 x10^-6 /K
Modulus of Elasticity 73 GPa
Thermal Conductivity 193 W/m.K
Electrical Resistivity 50.5 % IACS

Alloy Designations

Aluminium alloy QQ-A-250/5 has similarities to the following standard designations and specifications but may not be a direct comparison:

Alloy 2024, UNS A92024, AMS 4040, AMS 4041, AMS 4194, AMS 4195, AMS 4274 

Temper Types

Alloy QQ-A-250/5 is supplied in a wide range of tempers:

  • O - Soft
  • T3 - Solution heat treated, cold worked and naturally aged
  • T361 - Solution heat treated then stress relieved by stretching.
  • T4 - Solution heat treated and naturally aged to a substantially stable condition
  • T42 - Solution heat treated and naturaly aged to a substantially stable condition
  • T81 - Solution heat treated, cold worked then artificially aged
  • T851 - Solution heat treated then stress relieved by stretching then artificially aged.
  • T861

Supplied Forms

Alloy QQ-A-250/5 is supplied in CLAD plate and sheet

  • Plate
  • Sheet

Mechanical Properties

Mechanical Properties shown are for '0' temper

Thickness (mm)Proof Strength (Min)Tensile Strength (Min)Elongation % (Min)
Over 0.2 up to & incl. 1.59720712
Over 1.6 up to & incl. 12.69722112
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Last Datasheet Revision

18 December 2013


This Data is indicative only and as such is not to be relied upon in place of the full specification. In particular, mechanical property requirements vary widely with temper, product and product dimensions. All information is based on our present knowledge and is given in good faith. No liability will be accepted by the Company in respect of any action taken by any third party in reliance thereon.

Please note that the 'Datasheet Update' date shown above is no guarantee of accuracy or whether the datasheet is up to date.

The information provided in this datasheet has been drawn from various recognised sources, including EN Standards, recognised industry references (printed & online) and manufacturers’ data. No guarantee is given that the information is from the latest issue of those sources or about the accuracy of those sources.

Material supplied by the Company may vary significantly from this data, but will conform to all relevant and applicable standards.

As the products detailed may be used for a wide variety of purposes and as the Company has no control over their use; the Company specifically excludes all conditions or warranties expressed or implied by statute or otherwise as to dimensions, properties and/or fitness for any particular purpose, whether expressed or implied.

Advice given by the Company to any third party is given for that party’s assistance only and without liability on the part of the Company. All transactions are subject to the Company’s current Conditions of Sale. The extent of the Company’s liabilities to any customer is clearly set out in those Conditions; a copy of which is available on request.