A. China: YB/T4001-1998 B. USA: ANSI/NAAMM (MBG 531-88) C. UK: BS4592-1987 D. Australia: AS1657-1988 E: Japan: JJS Steel Grating Steel grating specification: Specifications of steel gratingsNoItemDescription1Bearing bar20x5, 25x3, 25x4, 25x5, 30x3, 30x4, 30x5, 32x3, 32x5, 40x5, 50…75x8mm, etc.2Bearing bar pitch25, 30, 30.16, 32.5, 34.3, 40, 50, 60, 62, 65mm, etc.3Cross bar5x5, 6x6, 8x8mm (twisted ...