... property 3.Maintenance-free; 4.ISO9001 Steel grating specification: Specifications of steel gratingsNoItemDescription1Bearing bar20x5, 25x3, 25x4, 25x5, ... US: ASTM (A123), UK: BS7299Steel grating standardsA. China: YB/T4001-1998B. USA: ANSI/NAAMM (MBG 531 ... engineering, Oil and grease chemistry, Agriculture husbandry, Horticulture, Steel industry, Waste disposal, Food processing, Aquatic breeding, ...