... : YB/T4001, ANSI/NAAMM-MBG531, BS4592, AS1657, JS31011.3 Grating Dimension Load Bearing Flat Bar sizeThickness≥3mm, depth ≥19mm19X3,19X5 ... etc.4. Capable design can make grating customized according to site requirement.our factory manufacturing steel gratings, centrifugal ductile iron pipes, ductile ... UK: BS4592-1987Australia: AS1657-1985 Plain bar hot dip galvanized steel grating weight from Anping