IR 5X8X12 Bearings
RPNA 15/28
RPNA 15/28 Bearings

NKIA 5901 Bearings

NKIA 5901
NKIA 5901 Bearings

NKIA 5901 Combined needle roller / angular contact ball bearing for axial loads in one direction

Technical Specification of NKIA 5901 Bearings

Dimensions of NKIA 5901 Bearings

0.472 in
Bore diameter
0.945 in
Outside diameter
0.63 in
0.63 in
Diameter of inner ring raceway
min.0.012 in
Chamfer dimension

Abutment Dimensions of NKIA 5901 Bearings

min.0.551 in
Diameter of shaft abutment
max.0.866 in
Diameter of housing abutment
max.0.012 in
Radius of fillet

Caliculation Data of NKIA 5901 Bearings

Basic dynamic load rating, radialC
1 819 lbf
Basic static load rating, radialC0
2 169 lbf
Basic dynamic load rating, axialC
465 lbf
Basic static load rating, axialC0
432 lbf
Fatigue load limit, radialPu
256 lbf
Fatigue load limit, axialPu
19 lbf
Reference speed 
22 000 r/min
Limiting speed 
26 000 r/min

Mass of NKIA 5901 Bearings

0.088 lb

Product Features of NKIA 5901 Bearings

  • Aligning needle roller bearings are self-aligning and provide a compact solution in applications where space is at a premium.

  • They have a high load carrying capacity due to their large number of rollers. Their internal design, where the convex outer ring meets two concave seat rings encapsulated in a drawn sleeve, allows the bearing to accommodate initial static misalignment.

  • If the shaft can be hardened and ground, the inner ring-less bearing is the best choice for compact bearing arrangements.

  • High radial load carrying capacity

  • Adapts to static initial misalignment

  • low cross-sectional height

  • Suitable for compact bearing arrangements

Applications of NKIA 5901 Bearings

  • The following are examples of applications where needle roller bearings may be used:
  • Household appliances; automobiles, electrical, instruments, construction machinery, railroad vehicles, agricultural machinery, etc..
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Steel Industry
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Food Processing Machinery
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Mining & Construction
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Electric motors and generators

Product classification of Needle roller bearings


  • Ball bearings are ideal for high-speed rotation, while roller bearings are more suited for high loads.
  • Because cylindrical roller bearings have separable inner and outer rings, they generally do not come with seals (open specification). As such, please apply seals or other protection around the equipment mounting.
  • EW Series bearings are small and utilize a pressed cage, making them suitable for standard operating conditions. ET Series bearings use a polyamide-resin cage suited for high temperatures. Finally, EM Series bearings have machined cages for use in harsh conditions such as gearboxes or vibrating machinery or in applications where the bearing must be quiet, such as in mid-to-large size motors.

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