... 4.Galvanized, Black, Steel Grating Size fields:1) Bearing Bar (Load Bar) Specifications (mm): The specification of plain type and ... serrated type bearing bar is 20 x 5 to 75 x 8mm;the specification ... 4, 75 x 7 x 4, etc.2) Bearing Bar Pitch (center to center): ,30, 30.16, 32.5 ... and 30, 40, 50,60mm are recommended,3) Cross Bar Pitch (center to center): 40,50, 50.16,65 ...