... plain steel grating, serrated steel grating, I section type steel grating. We are the leading manufacturer and exporter ... Bar) Specifications (mm):The specification of plain type and serrated type bearing bar is 20 x 3 to 100 ... x 6; the specification of I-section type is 25 x 5 x 3, 32 x ... 40, 60mm are recommended, America standard is available. 3) Cross Bar Pitch (center to center): 30, 38, 50, 76 ...