... C-- socket-weldingBearing bar centers:15-30, 40, 60, 80, 90 mm etc. with 30, 40 mm recommended.Cross bar centers:any greater than ... : ANSI/NAAMM(MBG531-93)Austrilia: AS1657-1992Marks:Example: G 325/30/100 WFG Heavy load steel grating,heavy duty steel grate ...