... steel 2)Bearing bar size: 20 x 3mm up to 90 x 7mm 3)Bearing bar pitch: 30, 40 ... and serrated type bearing bar is 20 x 3 to 100 x 6; the specification of I-section type ... x 4, etc.2. Bearing Bar Pitch (center to center): 15, 30, 40, 60, 80, 90mm etc, or according ... I I section style6. Surface Treatment: ο G Hot dip galvanized ο P Painted ο U Untreated7. Steel grating standards: ο China: YB/T4001- ...