MIL-STD-866C, MILITARY STANDARD: GRINDING OF CHROME PLATED STEEL AND STEEL PARTS HEAT TREATED TO 180,000 PSI OR OVER (01 MAR 2007) [NO S/S DOCUMENT]., This standard covers the requirements for grinding of martensitic high strength steel heat-treated to 180,000 pounds per square inch (PSI), ultimate tensile strength (UTS) and above, and the grinding of chromium plating applied to such high strength steel, when such parts are intended for use in components for man-rated flight hardware.