... Bearing Bar Pitch (center to center): 12.5, 15,25, 30, 30.16, 32.5, 34, 40, 41.25, 45, 50 ... 100 mm etc, also be according to client's requirement and 30, 40, 60mm are recommended, America standard is also available ... 1/2'' x 1/4''(19-w-4), (11-w-4), (8-w-4) and so on.3) Cross Bar ... 101.6mm etc, also be according to client's requirement and 50, 100mm are recommended, America standard is available.4) ...