hot-dip galvanized steel grating material: Q235,Q255,Q305,Q405,etc. manufactures bearing bar pitch:30-90mm ISO9001/2000 General Information of Steel Grating1,Bearing barA flat bar withstanding the main load is in consistent with the two adjacent bearing bars.2,Bearing bar pitch-The distance center to center of the two adjacent bearing bars.3,Cross bar-The connecting bars,made from twisted bar ...