Aluminum Rectangular Tube 6063 Aluminum 6063 T52 Rectangle 6 ft Overall Length 3 3/4 in Inside Width 1 1/2 in Inside Height 4 in Outside Width 1 3/4 in Outside Height 0.125 in Wall Thickness Wall Thickness Tolerance +/-0.015 in Fabrication Extruded Heat Treatment Tempered Heat Treatable Yes Mechanical Finish Mill Yield Strength 21 000 psi Tensile Strength 27 000 psi 60 Brinell Hardness B60 Rockwell Hardness Standards AMS QQ-A-200/9 Minimum Temperature -320 Degrees F