... requirement and 30,40,60mm are recommended3) Cross bar picth:38,50,76,100mm,also be according ... steel or stainless steel.6) Surface treatment: untreated, painting or hot dip galvanizing.7Steel grating with America standard ... can also be fabricated.Grating Dimension Bearing bar pitch(mm)12.5, 15,25, 30, ... 25, 45, 50, 60, 60.32, 80, 100Cross bar pith(mm)38, 50, 76, 100, 101.6Thickness(mm ...