... 00)ASTM(A36)ASTM(A123)BritainBS4592-1995BS4360(43A )BS729AustraliaAS1657-1992AS3679AS16502.Bearing Bar Sizes: 1"x1/8",1-1/4"x1/ ... 2"x3/16",2"x3/16",2"x1/4".3.Bearing Bar Pitches:12.5mm,15mm,24mm,25mm,30mm,30. ... There are three kinds of steel gratings distinguished by different bearing bar types.The respective of features are as follows: ... old and new customers! Hot-dip Galvanized Stair Tread(Factory)