Alignment Needle Roller Bearings
A needle roller bearing carried inside a sphered outer housing ring, so the needle set can swivel to follow the shaft. It removes the edge loading that ordinary needle bearings suffer whenever the bore and the shaft are not truly concentric. SES holds the range as an authorised SKF distributor, covering bore range About 12 mm to 100 mm; designation family PNA and related series; misalignment A few degrees, static alignment on assembly; construction Needle bearing inside a sphered outer housing ring. Executions include open alignment needle roller bearings, sealed alignment needle roller bearings, with inner ring, without inner ring, among others. It is specified most often into welded conveyor frames with unmachined bearing bores and agricultural and material handling machine rollers. 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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Alignment
Sphered outer ring, static error absorbed
Section
Higher than a plain needle bearing
Load
High radial, no axial
Application
Fabricated and welded structures
Where it runs.
You will find Alignment Needle Roller Bearings in the parts of a plant where this particular duty actually occurs. In practice that means welded conveyor frames with unmachined bearing bores, agricultural and material handling machine rollers, fabricated linkages in fabrication shop equipment, and equally support rollers in packaging and paper converting lines, guide rollers on long, deflecting shafts, light crane and trolley wheel assemblies. What links them is the duty rather than the machine name — alignment: Sphered outer ring, static error absorbed. 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. The housing bores are burned or drilled rather than line-bored — The alignment execution, since a plain needle bearing under angular error carries the whole load on the first two or three needles. The shaft deflects noticeably under working load — This type at both ends, sized on the reduced capacity that the sphered outer ring construction gives. The available radial section is very tight — A plain needle bearing and proper bore machining. The sphered outer ring adds section height that a shallow housing will not accept. 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.
Alignment types absorb static misalignment, not continuous angular movement. If the shaft is swinging under load, the fault is in the structure and the bearing will only mask it for a while. Send the designation off the failed part and we will confirm the SKF equivalent and stock position.