... ,trench cover,steel grating,stair tread,steel grating,plain steel grating,galvanized gratingThe walkway grating commonly used ... on bridge,refinery ,power plant,Sewage treatment plant and so on.Bearing bar pitches maybe 12.5, ... ,30,40,50,60,80mm,of which 30 and 40mm are recommended.Corss bar pitch maybe 38 ... are recommond.Type of bearing bar can be plain and serratted.Grating Dimension Bearing bar pitch(mm) ...