Aluminum is generally extruded in common shapes for many dimensions. For 
the cost of an extrusion die almost any shape is available. It might be 
that the angle you found was either the end of a special run, or someone 
needed a size and the extruder had the die, and made a run for sale. I'm 
more familiar with structural shapes, mostly steel. Some of the steel 
shapes are also available in aluminum, and fiberglass. Try googling 
aluminum angle dimensions or similar. For small quantity (less than a 
mill run quantity), you are at the mercy of suppliers that can ship to 
you. What they have stock is what is available.

If you can live with a sheared sharp cornered leg, and can find angle 
with longer legs, should be able to get the longer legs sheared to your 
dimensions. Also note that aluminum comes in many different alloys. Some 
are weldable, others more corrosion resistant, and others higher strength.

On 4/23/2010 2:00 PM, peter green wrote:
> Carl Denk wrote:
>    
>> That is not a standard size for an extruded aluminum angle.
>>      
> Well the stuff that I got from metalsontheweb.co.uk looked to mke like
> it had been extruded at that size (the corner was definately extruded
> and I didn't notice any surface finish differences on the end edges
> which i'd expect if it was a larger size cut down).
>
> Is there a list of "standard sizes" for this stuff? does that list vary
> by country
>    
>> !/8" thick
>> can be bent fairly easily if you can live with the radius instead of a
>> square exterior corner.
>>      
> That was the option of last resort but I'd rather avoid it if possible.
>
> I'll probablly just try my luck with ukaluminium.co.uk unless someone
> here warns me against them.
>    
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