6005A Overview

6005A is an architecturally pleasing structural alloy suitable for most industrial and commercial applications. While being the lowest in strength, 6005A is considered the most versatile of the structural alloys (6005A, 6061, 6082 and 6351). 6005A is a medium strength, general purpose, aesthetically attractive, heat treatable alloy with excellent corrosion resistance and weldability. 6005A is typically ordered as temper T5 for general purpose applications. This alloy is the most suitable structural alloy for complex shapes and thin walls with a smooth surface finish.

Common Applications

6005A can be extruded to semi complex shapes applicable to a range of industrial and commercial applications where superior surface finish and structural integrity is important. It is commonly used for light structural applications including defence, transport, pontoons, pylons, tubes and hollows, marine, automotive and rail.


6005A has excellent weldability by all standard methods including GMAW (MIG) and GTAW (TIG). Filler alloy 4043 is the primary filler, with 5356 wire being the suggested alternative.


Machinability of 6005A is fair to good.

Similar Products

Alloy 6060 or 6063 can be substituted for 6005A providing a weaker yet architecturally pleasing solution whereas 6061, a medium strength structural alloy with reduced surface finish, can provide an improved structural solution.

Chemical Composition Specification (%) Single values are maxima except as noted

Alloy Si Fe Cu Mn Mg Cr Zn Ti Other
Each Total
6005A 0.5-0.9 0.35 0.30 0.50 0.4-0.7 0.30 0.20 0.10 0.05 0.15
6061 0.4-0.8 0.70 0.15-0.4 0.15 0.8-1.2 0.04-0.35 0.25 0.15 0.05 0.15
6351 0.7-1.3 0.5 0.10 0.4-0.80 0.4-0.8 0.20 0.20 0.05 0.15
6082 0.7-1.3 0.5 0.10 0.4-1.0 0.6-1.2 0.25 0.20 0.10 0.05 0.15

Mechanical Property Specification – Single values are maxima except as noted

Alloy and Temper Thickness mm Tensile Strength Elongation (% min in 50mm)
Over Up to Ultimate Yield
Min Max Min Max
6005A T4 All Thicknesses 180 110 14
6005A T5 All Thicknesses 260 240 8
6061 T6 All thicknesses 260 240 8
6082 T6 <20mm 295 255 7
6351 T6 <150mm 295 255 8

Standards Referenced

AS/NZS 1866:1997 Reconfirmed 2020 – Aluminium and aluminium alloys – Extruded rod, bar, solid and hollow shapes AS/NZS 1664.2:1997 – Aluminium structures – Allowable stress design

AS/NZS 1665:2004 – Welding of aluminium structures

AAC (Australian Aluminium Council) publication – “Aluminium Standards Data and Design, Wrought products”.

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