M3856 Aluminum Square Tube 6 ft Overall L

M3856 Aluminum Square Tube 6063 Aluminum 6063 T52 Square 6 ft Overall Length 3 3/4 in Inside Width 3 3/4 in Inside Height 4 in Outside Width 4 in Outside Height 0.125 in Wall Thickness Wall Thickness Tolerance +/-0.008 in Fabrication Extruded Heat Treatment Tempered Heat Treatable Yes Mechanical Finish Mill Yield Strength 31 000 psi Tensile Strength 35 000 psi 73 Brinell Hardness B17 Rockwell Hardness Includes Material Certificate Yes Standards ASTM B221