NTN K81210 T2 Axial-Zylinderrollenkranz (50x78x9)

As an axial cylindrical roller and cage assembly, this component forms the axial load-carrying roller set and supports very high axial loads. The principal dimensions are 50x78x9 mm at a weight of 0.09 kg; the further technical details are listed in the specification table. Where the section height for a complete thrust bearing is not available, this roller and cage set guides the rolling elements directly between the component faces.

The axial cylindrical roller and cage assembly consists solely of rollers and a cage; it brings no raceway with it but presupposes one in the surrounding design. The adjoining faces must therefore be hardened, ground and square to the axis — otherwise thrust washers should be provided, which take on the same task as a replaceable part. Dispensing with washers of its own gives the smallest possible axial section height and allows a load-carrying face of the design to be used directly as a raceway.

As with every axial roller arrangement, the roller slides relative to the raceway along its length, which is why speed, lubricant film and heat dissipation must be considered together and a minimum axial force should be present. Standard bearing steel provides the required rolling element hardness after heat treatment; for the design, the hardness and quality of the mating raceway faces matter as much as the rating of the assembly itself.