6063 Overview

6063 is a medium strength heat treatable alloy with good corrosion resistance, weldability and responsiveness to anodising. 6063 is typically ordered as temper T5 for general purpose applications whereas temper T6 may be required for increased mechanical properties.

Common Applications

6063 can be extruded to complex shapes applicable to a range of industrial and commercial applications where superior surface finish is important. It is commonly used for windows, doors commercial building requirements, general manufacturing and fabrication work. This also includes irrigation, marine, furniture and transport.


6063 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 6063 is fair to good.

Similar Products

Alloy 6060-T5 may be offered as a substitute to 6063-T5. They are similar in composition chemically and mechanically and are often functionally interchangeable. Albeit they are different alloys and need to be considered on a fit for purpose basis by the purchaser. Both 6063 and 6060 can be produced to differing tempers though 6063 can be produced to a greater range of tempers that conform to the AS/NZS 1866:1997 (application dependent).

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

Alloy Si Fe Cu Mn Mg Cr Zn Ti Other
Each Total
6060 0.3-0.6 0.1-0.3 0.10 0.10 0.35-0.6 0.05 0.15 0.10 0.05 0.15
6063 0.2-0.6 0.35 0.10 0.10 0.45-0.9 0.10 0.10 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
6060 T1 <12mm 115 60 12
6060 T5 <12mm 150 110 8
6063 T1 <12mm 115 60 12
6063 T4 <150mm 130 70 12
6063 T5 <12mm 150 110 8
6063 T6 <25mm 205 170 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”.

The information in this data sheet document is not an exhaustive statement of all relevant information and is provided by way of general information only. BlueScope Distribution Pty Ltd makes no representation or warranty in relation to this data sheet document or the products or processes it describes, and takes no responsibility for any adverse consequences of any nature which arise as a result of reliance on the information or recommendations contained in it. You must make your own assessment of the information and recommendations contained in this data sheet document, including when necessary seeking specific advice as to the suitably of the products or processes featured in this data sheet document for the purpose for which, and the manner in which, you propose to use them. This may involve further independent analysis and testing.