... 80 and 90mm; of which 30and 40mm are recommended2) Cross bar pitch may be 30, 38, 50, 76 ... , 19-w-2, 15-w-2 etc. 3Twisted Cross Bar Pitch38.1, 50, 60, 76, 80, 100 ... , Q235, S275JR, SS304, Mild steel & Low carbon steel, etc5Surface TreatmentBlack, self colour, hot dip galvanized, painted, spray coating 6Grating StylePlain ... 1985,Germany: DIN24537-1-2006, Japan:JIS galvanized steel grating ladder (factory)