The 1630-2RS and 1630-ZZ is a 3/4 ball bearing that is found in many applications. The 1630-2RS ball bearing has two contact rubber seals one on each side of the ball bearing. The 1630-ZZ ball bearing has two non-contact metal shields one on each side of the ball bearing. If your application requires a 1630 ball bearing with only one seal or shield you can get this ball bearing and take one of the shields or seals off. This 3/4 inch ball bearing is high quality and can take electric motor demands if needed.   1630-2RS 19.050*41.275*12.700mm Nonstandard Deep Groove Ball Bearing Advantages: 1. High operation precision; 2. Most rolling bearings can also be subjected to radial and axial loads, so the combined structure of bearings is simple; 3. For axle diameters of the same size, the width of rolling bearing is smaller than that of sliding bearing, which can make the axial structure of machinery compact; 4. Under ordinary conditions, the efficiency of rolling bearing is equal to that of hydrodynamic smooth bearing, but higher than that of inclusion smooth bearing.