Aluminium alloy grating specification: Type Plain / Smooth, Serrated /teeth, I bar, serrated-I bar Steel flat size 20X3,25X3,25X5,30X3,30X4,30X5,32X3,32X5�?�120X10mm,.etc. Bearing bar pitch 12.5,15,20,25,30,35,40,50;120mm Cross bar pitch 38,50,80,100mm material aluminum alloy Surface treatment Untreated, oxidation Grating Standard China: YB/T 4001.1-2007 USA: ANSI/NAAMM(MBG531-88) UK: BS 4592-1987 Australia: AS 1657-1985 Material standard China: GB 700-88 UK: BS 4360:1990 USA: ASTM A36/A36M-96 AUSTRALIA: AS 3679
