... (mm): The specification of plain type and serrated type bearing bar is 20 x 3 to 100 x 10; The specification ... x 4, 75 x 7 x 4, etc. 2) Bearing Bar Pitch (center to center): 12.5, 15, 25, 30, 30 ... . > 4) Material: Mild Steel (Low Carbon Steel) or Stainless Steel 5) Surface Treatment: Untreated, Painting or Hot DIP Galvanizing 6) Steel grating standards: A) China ...