INA NKIA5903 Schrägkugellager (17x30x18)

As a combined needle/thrust bearing, this bearing carries radial and axial loads simultaneously. At 17x30x18 mm and a unit weight of 0.053 kg, the installation envelope is fixed; further technical details are held in the specification table. Radially over needle rollers, axially over angular contact balls — the combined design covers both directions in a compact section with an open rolling chamber.

The combined needle roller / angular contact ball bearing joins a radially carrying needle roller assembly to an axially carrying ball row whose raceways sit at a contact angle to the bearing axis. Compared with a flat axial stage, the contact angle yields higher axial stiffness and better speed capability, which makes the design suitable for feed and positioning axes with a simultaneous transverse load.

The two rolling element sets act independently, so the radial and axial ratings are to be assessed separately and neither applies to the other direction. In the open design the unit has no seal of its own; lubrication, sealing and relubrication are handled by the surrounding construction, which eases installation in oil-lubricated gearbox interiors and keeps the frictional torque low.

Standard bearing steel is through-hardened; for the design, radial and axial force, speed and the lubrication concept of the installation space should be assessed together.