NKIA59-22 bearing: complete specifications & equivalents
The NKIA59-22 is a DIN 616 radial bearing sized 22 x 39 x 23 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 22 mm |
| Outer diameter D | 39 mm |
| Width B | 23 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | none |
| Basic dynamic load rating C | 23.3 kN |
| Basic static load rating C0 | 32 kN |
| Fatigue load limit Pu | 3.9 kN |
| Reference speed (thermal) | 14000 rpm |
| Limiting speed (mechanical) | 15000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 120 g |
| Manufacturer designation | NKIA 59/22 |
| Standard | DIN 616 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.7 needle roller / angular contact ball bearings |
| Last verified | 2026-09-26 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.7 needle roller / angular contact ball bearings) · extracted 2026-09-26
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.7 needle roller / angular contact ball bearings); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.
Dimensions in inches & NKIA-series range
| Bore d | 0.866 in |
|---|---|
| Outer diameter D | 1.535 in |
| Width B | 0.906 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 8.5 mm |
| Smallest bore in NKIA-series | 12 mm |
| Largest outer diameter in NKIA-series | 100 mm |
| Width range across NKIA-series | 16–40 mm |
| Bore position in NKIA-series (smallest first) | 5 of 15 |
| Bore above smallest NKIA-series size | 10 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the NKIA59-22 model number is decoded
NKIA 59/22 solves compact radial-plus-thrust duty: a needle roller cage and an angular contact ball bearing built into one 23 mm wide unit with a 22 mm bore and 39 mm outside diameter. Reading the designation: the letters combine the needle roller family with the ball execution — NKIA marks angular contact — and 5922 the heavy 59 dimension series around the 22 mm bore. Execution notes: the ball set runs on a raceway offset by a catalogue-listed offset from the roller set centreline — this offset is why the overall width exceeds a plain needle bearing and why the units cannot be dismantled without losing preload. The ball set also needs a minimum axial load to keep every ball tracking its raceway under the radial-axial load mix: springs or preload washers are part of the arrangement, not an afterthought. Life-lubricated as supplied in most sizes; where a relubrication path exists, meter grease gently — pressure through the 23 mm wide unit can lift the seals of adjacent components.
Typical equipment & failure modes
Common applications
- worm gear shafts with axial reaction toward the worm
- spindle heads needing compact radial-plus-axial support
- lead-screw and ball-screw support positions
- pump rotors with hydraulic axial pull
Known failure patterns
- needle edge loading and raceway denting when the shaft deflects beyond the compensation range
- cage pocket wear and roller skew after sustained operation with too little radial preload
- grease starvation at the roller ends when relubrication intervals are stretched in dirty duty
- electrical erosion on VFD-driven shafts without brush or insulated mounting
- thrust-part ball or roller skidding and smearing when the axial load falls below the minimum factor
Selection pitfalls — read before you substitute
- On a 22 mm seat the housing bore quality dominates life: a bore 0.02 mm out of round pinches the 39 mm ring or cup into a lobed shape, and the rollers then trace the housing's geometry error, not the design load.
- The quoted 23.3/32 kN ratings are SKF catalogue values for this exact execution (NKIA 59/22); ratings can be revised without the order number changing, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the drawing.
- Oscillating pivots fail differently: rocking through a small angle concentrates wear in the same roller positions — inspect those zones, and consider rotating the assembly's clock position at service intervals.
- Do not treat the axial rating 4.14 kN (Ca) as independent of radial load: the combined equivalent load formulas couple them, and a unit sized on radial life alone will spall the ball raceway first under real thrust.
- The thrust part is one-direction: reverse axial events — however brief — lift the rolling elements off the raceway, and the subsequent re-entry impact dents the washer face; mount the NKIA 59/22 facing the working thrust.
- The 23.3/32 kN ratings and 120 g mass are SKF catalogue values transcribed from ch. 7.7 of PUB BU/P1 17000 (PDF table page 654); combined-type axial ratings appear in the text above because the structured record carries radial values only.
Frequently asked questions
Which dimensions does the NKIA 59/22 have?
A NKIA 59/22 measures 22 mm bore/Fw × 39 mm outside diameter × 23 mm width (0.866 × 1.535 × 0.906 in). From SKF catalogue PUB BU/P1 17000: radial dynamic rating C 23.3 kN, static C0 32 kN, fatigue limit Pu 3.9 kN, limiting speed 15,000 r/min, reference speed 14,000 r/min, mass about 120 g. Axial ratings of the ball part: dynamic Ca 4.14 kN (Ca), static C0a 4.93 kN (C0a); angular contact geometry leans axial capacity toward one direction.
What does NKIA 59/22 mean in SKF part numbering?
NKIA combines a needle roller cage with an angular contact ball bearing in one unit; 5922 gives the series and 22 mm bore. The offset (a catalogue-listed offset) positions the ball raceway inside the 23 mm overall width.
Does the NKIA 59/22 need a hardened and ground shaft?
The needle roller part of the NKIA 59/22 rides directly on the 22 mm journal, so it must be hardened to 58–64 HRC and ground; the ball set runs on its own integrated raceways. There is no inner-ring variant — harden the shaft or move to a separate bearing arrangement.
What mounting mistakes ruin a NKIA 59/22?
Press on the ring faces only with a fitting sleeve, keep everything square to the 22 mm seat, and never transmit force through the rolling elements. Follow the catalogue's seat tolerances — the narrow needle contact forgives neither tilt nor burrs.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.7 needle roller / angular contact ball bearings on 2026-09-26. Read our editorial & correction policy.