Strength in numbers

Aluminium Alloy   |   BS-L

L109 T4 Sheet

Commercial2024 CLAD 1050A

High strength fabricated or machined items in aircraft industries, general engineering, machinery, military equipment, truck wheels. Screw machine products. Structural applications. Rivets.

Characteristic Properties:
Heat treatable alloy. Very good machining characteristics. High strength alloy with a strength slightly higher than 2014(A) and 2017A and 2030. High fatigue strength. Suitable for welding only by resistance welding. Corrosion resistance only with cladding or other protection.

Chemical Composition

BS L109(1971)
Alloy L109
Chemical Element % Present
Aluminium (Al) balance
Nickel (Ni) 0.05 max
Lead (Pb) 0.05 max
Tin (Sn) 0.05 max
Chromium (Cr) 0.1 max
Zinc (Zn) 0.2 max
Titanium + Zirconium (Ti+Zr) 0.2 max
Iron (Fe) 0.5 max
Silicon (Si) 0.5 max
Manganese (Mn) 0.3 - 0.9
Magnesium (Mg) 1.2 - 1.8
Copper (Cu) 3.8 - 4.9

Heat Treatment: Material shall be supplied solution treated, straightened and aged at room temperature. Material shall be heat treated as follows: 1. Solution treat by heating at a temperature of 495 +/- 5Cand quenching in water at a temperature not exceeding 40C. 2. Age at room temperature for not less than 48 hours.

Alloy Designations

Aluminium alloy L109 - 2024 clad 1050A is covered by standard BS L109 (1971)

Temper Types

The most common temper for L109 - 2024 clad 1050A aluminium is:

  • T4

Supplied Forms

L109 - 2024 CLADd 1050A aluminium is as sheet an strip

  • Sheet
  • Strip

Generic Physical Properties

Physical Property Value
Density 2.79 g/cm³
Melting Point 640 °C
Thermal Expansion 23.1 x10^-6 /K
Modulus of Elasticity 73 GPa
Thermal Conductivity 121-193 W/m.K

Mechanical Properties

BS L109(1971)
Sheet - 0.4mm to 0.8mm
Mechanical Property Value
Tensile Strength 405 Min N/mm2
Elongation A %
0.2% Proof Stress 270 Min N/mm2
Elongation A50 mm 12 Min %

This specification covers aluminium-coated sheet and strip of aluminium-copper-magnesium-manganese alloy. The cladding material shall comply with the international designation 1050A. Mechanical property values relate to material with a nominal thickness of 0.4 up to and including 0.8mm. This specification contains other values for different material thicknesses.