Physical PropertiesMetricEnglishCommentsDensity2.78 g/cc0.1 lb/in�AA; TypicalMechanical PropertiesHardness, Brinell128128500 kg load/10 mm ballHardness, Knoop161161Estimated from BrinellHardness, Rockwell A4949Estimated from BrinellHardness, Rockwell B7979Estimated from BrinellHardness, Vickers146146Estimated from BrinellTensile Strength, UltimateMin 455 MPaMin 66000 psiTensile Strength, YieldMin 400 MPaMin 58000 psiElongation at Break5 %5 %Modulus of Elasticity72.4 GPa10500 ksiEstimated from other heat treatments.Poisson's Ratio0.330.33Estimated from other heat treatments.Fatigue Strength117 MPa17000 psi500,000,000 cycles; completely reversed; R. R. Moore Machine and specimen.Machinability70 %70 %0-100 Scale (A=90; B=70; C=50; D=30; E=10)Shear Modulus27 GPa3920 ksiEstimated from similar Al alloys.Shear Strength296 MPa42900 psi