Aluminum Square Tube 3003 Aluminum 3003 Square 12 in Overall Length 3/16 in Inside Width 3/16 in Inside Height 3/16 in Outside Width 3/16 in Outside Height 0.014 in Wall Thickness Wall Thickness Tolerance +/-0.002 in Fabrication Extruded Heat Treatment No Heat Treatment Heat Treatable No Mechanical Finish Mill Yield Strength 21 000 psi Tensile Strength 22 000 psi 40 Brinell Hardness Standards ASTM B221 Minimum Temperature 900 Degrees F Maximum Temperature 1 200 Degrees F