... ) Specifications (mm):The specification of plain type, serrated type and I type bearing bar is 20 x 5 to 100 ... to 100 mm etc, also be according to client's requirement and 30, 40, 60mm are recommended, America ... to 101.6mm etc, also be according to client's requirement and 50, 100mm are recommended, America standard ... Steel Grating Standards:A) China: YB/T4001-1998B) U.S.A.: ANSI/NAAMM (MBG531-88)C) U.K.: ...