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Aluminium specification code for L110 and L165

Can somebody please explain what L110 & L165 aluminium is ?

Dino Cecala
aerospace - Australia
2006

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2006

These specifications are British Standard Aerospace series aluminium alloys.

L110 should be quoted as BS L110, this is Aluminium-coated sheet and strip of Aluminium-Copper-Magnesium-Manganese alloy (Cu 4.4, Mg 1.5, Mn 0.6). Commonly called clad 2024 T42.

L165 should be quoted as BS L165, this is Sheet and strip of Aluminium-Copper-Magnesium-Silicon-Manganese alloy (Solution treated and artificially aged) (Cu 4.4, Mg 0.5, Si 0.8, Mn 0.8). Commonly called 2014 T42.

Brian Terry
Aerospace - Yeovil, Somerset, UK

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2006

'L' indicates a British Standard aerospace aluminium alloy:
L110 is 2024-T42 Clad Sheet and Strip (cladding may be 1230, as in AMSQQ250F)
L165 is 2014A-T6 Clad Sheet and Strip (cladding is 1050A).
Vendors should have more info.
Standards available from ILS http://aero-defense.ihs.com

Ken Vlach [deceased]
- Goleta, California
Finishing.com honored Ken for his countless carefully researched responses. He passed away May 14, 2015.
Rest in peace, Ken. Thank you for your hard work which the finishing world, and we at finishing.com, continue to benefit from.

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2006

"L110 should be quoted as BS L110, this is Aluminium-coated sheet and strip of Aluminium-Copper-Magnesium-Manganese alloy (Cu 4.4, Mg 1.5, Mn 0.6). Commonly called clad 2024 T42.

L165 should be quoted as BS L165, this is Sheet and strip of Aluminium-Copper-Magnesium-Silicon-Manganese alloy (Solution treated and artificially aged) (Cu 4.4, Mg 0.5, Si 0.8, Mn 0.8). Commonly called 2014 T42"

Are these sheets of aluminium off the shelf at T42, or are they heat treated to T42 after forming ?

Dino Cecala
Aerostaff - Australia

T42 is the "as supplied" temper state. You then heat treat the material to obtain the temper state you require.

Brian Terry
Aerospace - Yeovil, Somerset, UK
2006