what's NN cylindrical roller bearings? where's rolling element bearings(NN ) manufacturer? how to buy NN roller bearings?

NN cylindrical roller bearings are a type of roller bearing that has two inner rings with no outer ring and two rows of cylindrical rollers. The NN stands for "double row, separate outer ring with two ribs on the inner ring."

NN cylindrical roller bearings are designed to carry heavy radial loads and can also handle moderate axial loads in both directions. they have a high radial stiffness and can operate at high speeds. the two rows of cylindrical rollers are arranged in a parallel configuration, which allows them to distribute the load evenly across the bearing.

NN cylindrical roller bearings are commonly used in applications that require high radial load capacity, such as in machine tool spindles, where they provide high rigidity and precision. They are also used in gearboxes, rolling mills, and other heavy-duty applications. they are available in different sizes and designs, and can be supplied with or without a cage, depending on the application requirements.

cylindrical roller bearings are a type of rolling-element bearing that use cylinders (or rollers) with a slightly modified shape to reduce friction between rotating and stationary components. Unlike needle roller bearings, which have long, thin cylindrical rollers, cylindrical roller bearings have short, thick cylinders that are slightly crowned or tapered to reduce stress concentrations.

cylindrical roller bearings are designed to handle high radial loads, and in some cases, moderate axial loads as well. they are commonly used in applications such as machine tools, rolling mills, electric motors, pumps, and gearboxes.

single row cylindrical roller bearings: these bearings have a single row of rollers, and are capable of handling light to medium radial loads.

double row cylindrical roller bearings: these bearings have two rows of rollers, and are capable of handling heavier radial loads than single row bearings.

full complement cylindrical roller bearings: these bearings have no cage or retainer, allowing for maximum roller capacity and load carrying capability.

multi-row cylindrical roller bearings: these bearings have more than two rows of rollers, and are used in extremely heavy-duty applications, such as large industrial gearboxes.

cylindrical roller bearings are a reliable and versatile type of bearing that can handle a wide range of loads and speeds.