Aluminium Alloy - BS-L - L103 T4

L103 T4

High strength structural components: aircraft (e.g. fittings and wheels), military vehicles and bridges, forgings for trucks and machinery (hydraulic etc.). Weapons manufacture, structural applications.

Heat treatable alloy. High mechanical strength slightly higher than 2011 and 2017A.

Chemical Composition

Spec: BS L103(1971)

Alloy L103

Chemical Element % Present
Tin (Sn) 0.0 - 0.05
Chromium (Cr) 0.0 - 0.10
Manganese (Mn) 0.40 - 1.20
Magnesium (Mg) 0.20 - 0.80
Copper (Cu) 3.90 - 5.00
Lead (Pb) 0.0 - 0.05
Titanium + Zirconium (Ti+Zr) 0.0 - 0.20
Iron (Fe) 0.0 - 0.50
Zinc (Zn) 0.0 - 0.20
Nickel (Ni) 0.0 - 0.20
Silicon (Si) 0.50 - 0.90
Aluminium (Al) Balance


Physical PropertyValue
Density 2.8 g/cm³
Melting Point 640 °C
Thermal Expansion 22.8 x10^-6 /K
Modulus of Elasticity 73 GPa
Thermal Conductivity 134 - 135 W/m.K

Spec: BS L103(1971)


Mechanical PropertyValue
Hardness Brinell 104 HB
Tensile Strength 370 N/mm2
Elongation A 14 %
0.2% Proof Stress 225 N/mm2

Alloy Designations

Aluminium alloy L103 - 2014A is covered by Standard BS EN 2100 and has similarities to the following standard designations and specifications but may not be a direct equivalent:

2014 / 2014A             AMS 4121

Temper Types

The most common temper for L103 - 2014A aluminium forging stock is T4

  • T4 - Solution heat treated and naturally aged to a substantially stable condition
  • T6 - Solution heat treated and artificially aged

Supplied Forms

L103-2014A aluminium is supplied as forging stock and forgings made from cast billet, extruded sections or rolled plate

  • Forgings
  • Bar
  • Castings
  • Extrusions
  • Plate
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Last Datasheet Revision

9 January 2014


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.