Cylindrical roller bearings are manufactured by NTN Bower® in several series that differ in proportion, width, and load rating. Bore size for each series increases in multiples of five or more millimeters and for each bore size a selection of different narrow and wide series is available to meet the needs of most applications. External dimensions and tolerances conform to RBEC 1 metric bearing standards as defined in the American Bearing Manufacturers Association (ABMA) and American National Standards Institute (ANSI). NTN Bower® standard product lines include two basic series the M series for light and medium radial loads and the W series for heavy to extra heavy radial loads. Only complete bearing assemblies interchange between the Max-Pak and the M series bearings separable rings and roller assemblies do not. The W (Max-Pak) series provides an average radial load rating increase of 20 percent and a life increase of 80 percent. These increases are possible by reducing the wall thickness of the bearing rings. This reduction provides additional space for larger rollers resulting in higher calculated ratings. Bower® Cylindrical Roller Bearing, Series: Max-Pak W60000, 140 mm Bore Dia, 180.185 mm Outside Dia, 1 Row, 48 mm W, Open Closure, 268000 N, Hardened Alloy Steel Bearing, X Bar Composite Steel Cage, -40 to 120 °C