NKX10-ZTN bearing: complete specifications & equivalents
The NKX10-ZTN is a DIN 616 radial bearing sized 10 x 19 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 | 10 mm |
| Outer diameter D | 19 mm |
| Width B | 23 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 5.94 kN |
| Basic static load rating C0 | 8 kN |
| Fatigue load limit Pu | 0.9 kN |
| Reference speed (thermal) | 9500 rpm |
| Limiting speed (mechanical) | 8000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 36 g |
| Manufacturer designation | NKX 10 ZTN |
| Standard | DIN 616 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.9 needle roller / thrust ball, caged thrust part |
| Last verified | 2026-09-26 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.9 needle roller / thrust ball, caged thrust part) · extracted 2026-09-26
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.9 needle roller / thrust ball, caged thrust part); 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 & NKX-series range
| Bore d | 0.394 in |
|---|---|
| Outer diameter D | 0.748 in |
| Width B | 0.906 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 4.5 mm |
| Smallest bore in NKX-series | 10 mm |
| Largest outer diameter in NKX-series | 85 mm |
| Width range across NKX-series | 23–40 mm |
| Bore position in NKX-series (smallest first) | 1 of 13 |
| Bore above smallest NKX-series size | 0 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NKX10-TN | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 10×19×23 mm envelope and equivalent catalogue ratings; NKX10-TN is the combined needle/thrust ball execution — boundary-dimension interchangeable, execution differences (seals, shields, cage) apply. |
Interchange levels: full standard interchange · partial verify parameters · verify manual confirmation required. Links resolve to the equivalent model's specification page where available.
How the NKX10-ZTN model number is decoded
The combined needle roller / thrust ball bearings with caged thrust part execution NKX 10 ZTN measures 10×19×23 mm and carries radial load 5.94 kN dynamic plus one-direction axial load 9.95 kN (Ca) — the caged thrust part runs at higher speed than full complement NX types. The code NKX 10 ZTN reads as combined radial/thrust for a 10 mm shaft; the catalogue height 23 mm stacks the radial cage and the thrust set, and the 19 mm OD seats both parts in one bore. Execution notes: the Z suffix adds a shield over the thrust balls, TN a polymer cage; the open execution allows relubrication through the shaft, the Z execution is greased for life. Speed ceilings differ by part: 9,500 r/min thermal reference and 8,000 r/min limiting — the thrust element governs, since its washer faces see sliding components of contact. The caged thrust part survives moderate speed only with the Z shield intact — damaged shields admit grit straight into the ball raceways, and the narrow section leaves no margin.
Typical equipment & failure modes
Common applications
- machine tool feed spindles with one-direction thrust
- pump impeller shafts with steady axial pull
- gear pairs generating one-direction axial force
- rotary indexing tables under combined load
Known failure patterns
- raceway spalling once the catalogue L10 life is exceeded or after overload events
- cage pocket wear and roller skew after sustained operation with too little radial preload
- abrasive paste formation from dust ingressing past open ends without effective housing seals
- false brinelling of standby equipment under external vibration
- thrust washer raceway wear from reverse axial shocks the one-direction thrust part cannot carry
Selection pitfalls — read before you substitute
- On a 10 mm seat the housing bore quality dominates life: a bore 0.02 mm out of round pinches the 19 mm ring or cup into a lobed shape, and the rollers then trace the housing's geometry error, not the design load.
- 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.
- Contamination, not fatigue, kills most small needle bearings: with raceways this narrow, one hard particle dents a full-width line — seal the housing even when the bearing execution itself is open.
- Do not treat the axial rating 9.95 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 NKX 10 ZTN facing the working thrust.
- The 5.94/8 kN ratings and 36 g mass are SKF catalogue values transcribed from ch. 7.9 of PUB BU/P1 17000 (PDF table page 658); combined-type axial ratings appear in the text above because the structured record carries radial values only.
Frequently asked questions
What limits the service life of a NKX 10 ZTN?
Beyond the L10 rating, the practical limits are journal/raceway hardness for the 10 mm seat, lubricant condition at the roller ends, and contamination through open ends — the 4.5 mm radial section leaves no reserve once a raceway is dented or ribboned.
What are the dimensions and ratings of the NKX 10 ZTN?
A NKX 10 ZTN measures 10 mm bore/Fw × 19 mm outside diameter × 23 mm width (0.394 × 0.748 × 0.906 in). From SKF catalogue PUB BU/P1 17000: radial dynamic rating C 5.94 kN, static C0 8 kN, fatigue limit Pu 0.9 kN, limiting speed 8,000 r/min, reference speed 9,500 r/min, mass about 36 g. Axial ratings of the thrust part: dynamic Ca 9.95 kN (Ca), static C0a 15.3 kN (C0a), minimum load factor A 0.0012; the thrust set carries load in one direction only.
How is the NKX 10 ZTN designation read?
NKX = needle roller radial part + caged thrust ball part for a 10 mm shaft: 19 mm OD, 23 mm overall height. The caged thrust part trades some axial capacity for higher permissible speed versus NX.
Can the NKX 10 ZTN run on an unhardened shaft?
The radial needle part of the NKX 10 ZTN runs directly on the 10 mm journal — harden to 58–64 HRC and grind it. The thrust washers are integral, so no separate inner ring exists; size the shaft for the raceway tolerances in the catalogue table.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.9 needle roller / thrust ball, caged thrust part on 2026-09-26. Read our editorial & correction policy.