+44 (0)1487 833 600
Wilsons is COVID-19 Compliant

Data Sheets

Aluminium Alloy


L111 T6511 Bar

Characteristic Properties:
Very good corrosion resistance. Very good weldability (lowered strength values in the weld zone). Good machinability. Good cold formability in T4 temper after a stabilizing heat treatment. Heat treatable medium high strength construction. Alloy with a strength somewhat higher than 6061. Medium high fatigue strength. Not suitable for complex sections.

Chemical Composition

BS L111(1971)
Alloy L111
Chemical Element % Present
Manganese (Mn) 0.40 - 1.00
Silicon (Si) 0.70 - 1.30
Magnesium (Mg) 0.50 - 1.20
Copper (Cu) 0.0 - 0.10
Iron (Fe) 0.0 - 0.50
Tin (Sn) 0.0 - 0.05
Chromium (Cr) 0.0 - 0.25
Nickel (Ni) 0.0 - 0.10
Lead (Pb) 0.0 - 0.05
Titanium (Ti) 0.0 - 0.20
Zinc (Zn) 0.0 - 0.20
Aluminium (Al) Balance

Generic Physical Properties

Physical Property Value
Density 2710 g/cm³
Melting Point 650 °C
Thermal Expansion 23.10 x10^-6 /K
Modulus of Elasticity 70000 GPa
Thermal Conductivity 167-216 W/m.K

Mechanical Properties

The Mechanical Properties values shown apply to material in the T6511 temper.

In the table, 'Dimension' means diameter or minor sectional dimension.

Dimension (mm)Proof Strength Tensile StrengthElongation
Up to & incl. 20255 Min295 Min7% Min
Over 20 up to & incl. 150270 Min310 Min8% Min
Over 150 up to & incl. 200240 Min280 Min5% Min


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.