... 1995BS4360(43A ) BS729 AustraliaAS1657-1992 AS3679 AS1650 2.Bearing Bar Sizes: 1"x1/8",1-1/4"x1/8",1 ... /16",2"x3/16",2"x1/4".3.Bearing Bar Pitches:12.5mm,15mm,24mm,25mm,30mm,30.16mm( ... .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: ...