Rollers are one of the components of bearings, and the corresponding bearings of different types of rollers are also different. So far, the rollers on the market can be divided into seven categories. They have different characteristics and play an important role in various bearings.

Among them, cylindrical roller is more common. It can be used not only in cylindrical roller bearings, but also in machinery. As the size of the roller has been standardized, it can be used as a commodity roller for design and user selection.

It can also be divided into two types, one with and without axle diameter. It can be used not only for long cylindrical roller bearings, but also for rolling components directly in machinery. Needle roller is also one of the rollers. It belongs to needle roller bearing, universal joint needle roller bearing and thrust needle roller bearing. It can also be used as a mechanical component.

Another kind is a conical roller with circular truncated cone shape. Its cone angle is usually 1 -4 20', and also less than 1 or more than 4 20', but mostly 2. Roller length generally does not exceed twice the diameter of the large end of the roller. It is widely used in tapered roller bearings, in which the roller with large taper angle is basically used for thrust tapered roller bearings.

In addition, spherical roller is more unique, as the name implies, the rolling surface of the roller is spherical. Usually, bearing with this kind of roller has automatic alignment performance and can withstand large loads. This kind of roller is used for aligning roller bearings and thrust aligning roller bearings.

In addition, there are spiral rollers and prop hole rollers, the former is a hollow rollers made of special cross-section steel strips, although not used very much, but mainly used for impact loaded spiral roller bearings; while the latter has through holes in the central position, in order to install props, so as to be fixed on the sheet prop cage.