1.Galvanized steel grating 2.Metal grating 3.ASTM A123,SS400 4.Common pitch:30mm ... .1.1 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, ... 30.6, 32.5, 34, 34.8, 35.3, 40, 60, 80……Pitch of cross bars(mm)38.1, 50 ...