NX15-Z bearing: complete specifications & equivalents
The NX15-Z is a DIN 616 radial bearing sized 15 x 24 x 28 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 15 mm |
| Outer diameter D | 24 mm |
| Width B | 28 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | none |
| Basic dynamic load rating C | 11 kN |
| Basic static load rating C0 | 14 kN |
| Fatigue load limit Pu | 1.66 kN |
| Reference speed (thermal) | 7500 rpm |
| Limiting speed (mechanical) | 5300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 48 g |
| Manufacturer designation | NX 15 Z |
| Standard | DIN 616 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.8 needle roller / thrust ball, full complement thrust part |
| Last verified | 2026-09-26 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.8 needle roller / thrust ball, full complement 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. 7.8 needle roller / thrust ball, full complement 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 & NX-series range
| Bore d | 0.591 in |
|---|---|
| Outer diameter D | 0.945 in |
| Width B | 1.102 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 4.5 mm |
| Smallest bore in NX-series | 7 mm |
| Largest outer diameter in NX-series | 47 mm |
| Width range across NX-series | 18–30 mm |
| Bore position in NX-series (smallest first) | 4 of 9 |
| Bore above smallest NX-series size | 8 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NX15 | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 15×24×28 mm envelope and equivalent catalogue ratings; NX15 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 NX15-Z model number is decoded
In SKF catalogue PUB BU/P1 17000, NX 15 Z denotes a combined bearing whose thrust part is filled with the maximum number of balls: highest axial capacity of the NX/NKX family at low-to-moderate speed, radial part 11 kN C. The number in NX 15 Z is the shaft diameter in millimetres; NX types differ from NKX only in the thrust part — full complement balls here, caged balls there — which changes axial capacity and speed ceiling. Full complement thrust parts run slower than caged ones: observe the 5,300 r/min limiting speed, and expect the thrust part to govern the thermal ceiling. Speed ceilings differ by part: 7,500 r/min thermal reference and 5,300 r/min limiting — the thrust element governs, since its washer faces see sliding components of contact. Mounting: assemble the thrust washer set with the keyed washer in the housing, fill the packed ball complement with grease so the balls adhere during fitting, and orient the thrust part toward the working axial load.
Typical equipment & failure modes
Common applications
- light rotary tables under axial load
- oscillating pivots with steady axial preload
- small hoisting and winch drums
- actuator output shafts
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
- grease starvation at the roller ends when relubrication intervals are stretched in dirty duty
- rolling-contact fatigue spalling after the rated L10 life
- 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 15 mm seat the housing bore quality dominates life: a bore 0.02 mm out of round pinches the 24 mm ring or cup into a lobed shape, and the rollers then trace the housing's geometry error, not the design load.
- Do not interchange envelope-identical needle families blindly: NX 15 Z shares its 15×24×28 mm outline with inner-ring and sealed siblings whose ratings differ — the family letters are part of the specification, not decoration.
- Reference and limiting speeds are different limits: the 7,500 r/min reference is the thermal criterion under load, The limiting value is mechanical; the reference value is thermal under load, and grease choice moves it substantially.
- Do not treat the axial rating 6.18 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 NX 15 Z facing the working thrust.
- The 11/14 kN ratings and 48 g mass are SKF catalogue values transcribed from ch. 7.8 of PUB BU/P1 17000 (PDF table page 656); 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 NX 15 Z?
Beyond the L10 rating, the practical limits are journal/raceway hardness for the 15 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 NX 15 Z?
A NX 15 Z measures 15 mm bore/Fw × 24 mm outside diameter × 28 mm width (0.591 × 0.945 × 1.102 in). From SKF catalogue PUB BU/P1 17000: radial dynamic rating C 11 kN, static C0 14 kN, fatigue limit Pu 1.66 kN, limiting speed 5,300 r/min, reference speed 7,500 r/min, mass about 48 g. Axial ratings of the thrust part: dynamic Ca 6.18 kN (Ca), static C0a 12.2 kN (C0a), minimum load factor A 0.00077; the thrust set carries load in one direction only.
How is the NX 15 Z designation read?
NX = needle roller radial part + full complement thrust ball part for a 15 mm shaft; the catalogue plan completes 24 mm OD and 28 mm overall height. The packed thrust set maximises axial capacity at low speed.
Can the NX 15 Z run on an unhardened shaft?
The radial needle part of the NX 15 Z runs directly on the 15 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. 7.8 needle roller / thrust ball, full complement thrust part on 2026-09-26. Read our editorial & correction policy.