... .1 Material Q235 , or other equivalent material1.2 Grating Conformity Standard: YB/T4001, ANSI/NAAMM-MBG531, BS4592 ... , AS1657, JS31011.3 Grating Dimension Load Bearing Flat Bar sizeThickness≥3mm, depth ≥19mm19X3 ... of Load bearding flat bars(mm)12.5,15, 20, 30, 30.6, 32.5, 34, 34.8 ... 80, 100, 101.6, 102……The sizes and dimension is not limited to above.1.4 Grating type: flat bar: ...