... , BS4592, AS1657, JS31011.3 Grating Dimension Load Bearing Flat Bar sizeThickness≥3mm, depth ≥19mm19X3,19X5,20X3, 20X5, ... …..40X6, 40X8, 40X10,….90X6….Pitch of Load bearding flat bars(mm)12.5,15, 20, 30, 30 ... twisted cross bar1.5 Finishing treatment: hot dip Galvanized 2. 11 sets of press welded (electro-forged ... grating customized according to site requirement. Galvanized Steel Grating_Serrated type