Bearing bar pitch:30,40,60mm Cross bar pitch;50,100mm Plain,Serrated,I- ... , etc.2) Bearing Bar Pitch (center to center): 12.5, 15, 25, 30, 30.16, 32.5, 34, 40, 41.25, 45, 50 ... mm etc, also be according to client's requirement and 30, 40, 60mm are recommended, America standard is available < 1'' x ...