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Rectangular ASTM A 1011 30×100mm pitch commercial steel grating, is one of the normal size of steel gratings, another writing is 19W4. Rectangular ASTM A 1011 30×100mm pitch commercial steel grating is made by the world first-class equipment,which can arrange the bearing bar and cross bar in longitude and latitude order to certain distance.cross bar is pressed into the bearing bar by high tension resistance welding ring which is controlled by computer.so we can produce high quality gratings with firm welding,smooth surface and high strength. Rectangular ASTM A 1011 30×100mm pitch commercial steel grating, with robust design and spanning abilities, is very strong and safe for the support of floors and elevated walkway. It can be used for ceiling, interior decoration, decoration, platform aisle, ventilation windows, (Wells), advertising plaque and other construction.