Angular Contact Ball B. SKF 7212 BEP

The contact angle describes the angle at which the line connecting the points of contact between the ball and the raceways is inclined to the radial plane. A contact angle of 40 degrees enables the transmission of particularly high axial forces in one direction. The bearing simultaneously accommodates radial loads; however, it must always be loaded axially in the direction of the force or supported against a second bearing.

As the unit is supplied ex works without sealing washers, the roller bearing is lubricated directly by the surrounding machinery. Depending on the design requirements, either grease or gear oil may be used for this purpose. The application’s housing must therefore be fitted with external seals to prevent lubricant loss and the ingress of dirt particles.

The polyamide cage is suitable for use at temperatures between -20 and +120 degrees Celsius. This material reduces the inertia of the cage and promotes smooth running. In applications close to the upper temperature limit, the lubricant should remain thermally stable to ensure that the cage is always sufficiently lubricated and operates with low friction.

The model is manufactured to standard dimensional and running accuracy in tolerance class P0/PN, which corresponds to the US standard ABEC 1. The bearing clearance corresponds to the standard radial bearing clearance for this size. The actual operating clearance is established once the bearing is fitted, as soon as the shaft is pressed in and the bearing is preloaded or adjusted axially within the assembly.

Due to its design, a single-row angular contact ball bearing can only accommodate axial forces in a single axial direction. For alternating or bidirectional axial forces, a second bearing is usually mounted in a mirror-image configuration opposite the first, for example in an O or X arrangement. Alternatively, double-row bearings or four-point bearings are used for such applications.