... YB/T4001, ANSI/NAAMM-MBG531, BS4592, AS1657, JS3101 1.3 Grating Dimension Load Bearing Flat Bar sizeThickness≥3mm, depth ≥19mm19X3,19X5 ... used.And round cross bars are normally used for fine-mesh steel gratings. 1.5 Finishing treatment: a. Galvanized, b. ... from Japan, Germany,Switzerland,etc. 4. Capable design can make grating customized according to site requirement. ANY QUESTIONS , PLS FEEL FREE ...