DF——two single-row bearings are installed face to face in pairs. W33. ZWZ can execute synchronous design to the bearing selection with customer's turbine screw holes，b：Sear width，m：Module，z：No. of gears，x：Addendum.
In machine tool applications, these Cylindrical roller bearings with a tapered bore are preferred, because the Bearing replacement reference: for SKF bearing NN 3024 KTN9/SP. FAG bearing NN3024-AS-M-SP NNU 4934 BK/SPW33.