Still don't believe that aluminum can handle the load? How about 14mm wide T-slots using M12 hardware. The strongest aluminum framing system on the market. Competes head on with steel where you need strength and would love a T-slot. Designed for the most demanding framing applications.
Angle Brackets

50 x 50 x 40
82.60.0701
82.60.0701

50 x 50 x 100
82.60.0702
82.60.0702

50 x 50 x 40 keyed
82.60.0741
82.60.0741

50 x 50 x 100 keyed
82.60.0742
82.60.0742

110 x 50 x 40
82.60.0801
82.60.0801

110 x 50 x 100
82.60.0802
82.60.0802

110 x 50 x 40 keyed
82.60.0841
82.60.0841

110 x 50 x 100 keyed
82.60.0842
82.60.0842

110 x 110 x 40
82.60.0901
82.60.0901

110 x 110 x 100
82.60.0902
82.60.0902

110 x 110 x 40 keyed
82.60.0941
82.60.0941

110 x 110 x 100 keyed
82.60.0942
82.60.0942
Cast Consoles

170 x 170 x 100
31.60.0001
31.60.0001

170 x 170 x 160
31.60.0002
31.60.0002

230 x 170 x 100
31.60.0004
31.60.0004

230 x 170 x 160
31.60.0005
31.60.0005

230 x 230 x 100
31.60.0007
31.60.0007

230 x 230 x 160
31.60.0008
31.60.0008
Joining Plates

160 x 160 x 8
50.05.6010
50.05.6010

220 x 160 x 8
50.05.6012
50.05.6012

220 x 220 x 8
50.05.6014
50.05.6014

220 x 100 x 12
50.05.6026
50.05.6026