... Steel Galvanized Grating Grating type: flat bar: plain type, plain I type, serrated type, serrated I type; cross bar: round type and square twisted type. Grating Specification Load Bearing ... .3, 40, 60, 80……Pitch of cross bars(mm)38.1, 50, 50.8, 70, 75, 80, 100, 101.6, 102 ...