Combined Needle Roller Bearings
A needle roller set and a thrust element built into one unit, so a single component handles radial load together with axial load. It saves the axial space that a separate thrust bearing and its abutments would consume. SES holds the range as an authorised SKF distributor, covering bore range About 10 mm to 100 mm on common series; designation families NKX, NKXR, NKIA and related series; thrust elements Thrust ball, thrust cylindrical roller, angular contact ball; direction Single acting standard, double acting by pairing. Executions include needle roller and thrust ball bearings, needle roller and cylindrical roller thrust bearings, needle roller and angular contact ball bearings, with inner ring, among others. It is specified most often into machine tool feed screws and lead screw supports and gearbox output shafts with helical gear thrust. Every part is genuine SKF through official channels, with designation, specification and options confirmed against your duty before it ships — supplied from Kolkata and our branch network, with breakdown cover that does not sit in an inbox.
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Load
Radial plus axial in one unit
Thrust element
Ball, cylindrical roller or angular contact
Direction
Single or double acting by design
Space
Shorter than separate radial and thrust bearings
Where it runs.
You will find Combined Needle Roller Bearings in the parts of a plant where this particular duty actually occurs. In practice that means machine tool feed screws and lead screw supports, gearbox output shafts with helical gear thrust, robotics and automation actuator joints, and equally small hydraulic motor and pump shafts, rotary index tables and dividing heads, textile and converting machine drive spindles. What links them is the duty rather than the machine name — load: Radial plus axial in one unit. If your installation is not on that list it matters less than you would think: the operating condition decides the specification. Send us the load, the speed, the running temperature and the environment it runs in, and we will match it to the right execution in the SKF range and confirm what is in stock.
Specify it against the duty.
Specification here follows the operating condition, not the catalogue. Axial thrust from helical gearing acts in one direction — A single-acting needle roller and thrust ball unit oriented to that direction, confirmed against the gear hand and rotation. Thrust reverses in normal running — A double-acting execution or two opposed units, because a single-acting unit fitted against a reversal simply unloads. Thrust is high relative to the radial load — The needle roller and cylindrical roller thrust version, whose line contact carries far more axial load than a thrust ball element. Where two of those apply at once, specify for the harsher of the two — under-specifying is what puts the part back on the bench a month later. Send us the duty and we will confirm the execution.
Ordering this from SES.
Establish which way the axial component acts before you choose. A single-direction thrust element fitted the wrong way round leaves the shaft free to float and the gear will walk out of mesh under load.