1.ISO9001:2008 management 2.Sinosteel-Fortune 500 3.US, UK or ... A36)ASTM(A123)BritainBS4592-1995BS4360(43A )BS729AustraliaAS1657-1992AS3679AS16502.Bearing Bar Sizes: 1"x1/8",1-1/4"x1/8 ... 33mm,35.33mm,38mm,40mm,41.25mm,50mm,60mm4.Cross Bar Pitches: 38.1mm, 50mm, 75mm, and 100mm,101 ... three kinds of steel gratings distinguished by different bearing bar types.The respective of features are as follows:Plain ...