Stainless Steel Disc, Stainless Steel, 17-4, Disc, Outside Diameter 3 1/2 in, Outside Diameter Tolerance +/-0.005 in, 2 in Overall Length, Length Tolerance +/-0.125 in, Fabrication Hot Rolled, Heat Treatment Annealed, Heat Treatable Heat Treatable, Mechanical Finish Mill, Yield Strength 200,900 psi, Tensile Strength 208,600 psi, 35 HRC Rockwell Hardness, Includes Material Certificate Material Certificate with Lot Number, Standards AMS 5643, ASTM A564, Appearance Metallic