101 Copper Round Tube, Material Copper, Material Grade 101, Outside Diameter 2 1/4 in, Inside Diameter 1.625 in, Wall Thickness 0.3125 in, Overall Length 4 ft, Mechanical Finish Mill, Standards ASTM B75, ASTM F68, Wall Thickness Tolerance +/-0.004 in, Outside Diameter Tolerance +/-0.004 in, Fabrication Welded, Yield Strength 36,000 psi, Temper H80, Rockwell Hardness B40, Shape Round Tube, Application Automotive, Conductors, Particle Accelerators, Brinell Hardness 74, Appearance Metallic