NKXR17 bearing: complete specifications & equivalents
The NKXR17 is a DIN 616 radial bearing sized 17 x 26 x 25 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 17 mm |
| Outer diameter D | 26 mm |
| Width B | 25 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | none |
| Basic dynamic load rating C | 12.1 kN |
| Basic static load rating C0 | 16.6 kN |
| Fatigue load limit Pu | 1.96 kN |
| Reference speed (thermal) | 4300 rpm |
| Limiting speed (mechanical) | 8500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 50 g |
| Manufacturer designation | NKXR 17 |
| Standard | DIN 616 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.10 needle roller / cylindrical-needle thrust |
| Last verified | 2026-09-26 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.10 needle roller / cylindrical-needle thrust) · extracted 2026-09-26
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.10 needle roller / cylindrical-needle thrust); 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 & NKXR-series range
| Bore d | 0.669 in |
|---|---|
| Outer diameter D | 1.024 in |
| Width B | 0.984 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 4.5 mm |
| Smallest bore in NKXR-series | 15 mm |
| Largest outer diameter in NKXR-series | 62 mm |
| Width range across NKXR-series | 23–35 mm |
| Bore position in NKXR-series (smallest first) | 2 of 9 |
| Bore above smallest NKXR-series size | 2 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NKXR17-Z | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 17×26×25 mm envelope and equivalent catalogue ratings; NKXR17-Z is the combined needle/thrust needle execution — boundary-dimension interchangeable, execution differences (seals, shields, cage) apply. |
| NKX17-Z | SKF | full Dimensions and internal design equivalent — standard interchange. | Envelope-identical (17×26×25 mm) combined needle/thrust ball execution with ratings within 10 % — substitution possible after checking ring/flange construction. |
| NKX17 | SKF | full Dimensions and internal design equivalent — standard interchange. | Envelope-identical (17×26×25 mm) combined needle/thrust ball execution with ratings within 10 % — substitution possible after checking ring/flange construction. |
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 NKXR17 model number is decoded
For a 17 mm shaft under strong one-direction axial load with limited radial space, NKXR 17 from the combined needle roller / full complement needle thrust bearings stacks a caged needle radial part with a full complement thrust needle part: 17×26×25 mm. The code NKXR 17 identifies the construction exactly — needle radial part, needle thrust part — for a 17 mm shaft; the thrust set is one-directional and must face the working axial load. One-direction thrust only — reverse axial loads lift the packed needle set off its raceway; arrange a second unit mirrored or a separate thrust bearing for reversing duty. Selection arithmetic for the combined unit: radial C 12.1 kN, radial C0 16.6 kN, axial dynamic 12.2 kN (Ca) and axial static 31.5 kN (C0a); combine them with the equivalent-load factors from the catalogue before checking L10. Fit with a press against the washer faces only — needles packed without a cage will skew if the assembly is dropped or driven sideways onto the 17 mm seat.
Typical equipment & failure modes
Common applications
- turntables and slewing pivots with shock loads
- press-fit die set guide positions
- heavy screw presses and clamping spindles
- crane slew rings and kingposts at low speed
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 17 mm seat the housing bore quality dominates life: a bore 0.02 mm out of round pinches the 26 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.
- Minimum axial load is a real requirement: below factor A 0.000079 the thrust elements skid, polish their raceways and lose them — springs or preload washers belong in the arrangement drawing, not the troubleshooting notes.
- Height stack-up is easy to mis-check: the thrust-washer part adds height beyond a plain needle bearing, and clamping the stack solid over it preloads the thrust set beyond its rating.
- The 12.1/16.6 kN ratings and 50 g mass are SKF catalogue values transcribed from ch. 7.10 of PUB BU/P1 17000 (PDF table page 660); 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 NKXR 17?
Beyond the L10 rating, the practical limits are journal/raceway hardness for the 17 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 NKXR 17?
A NKXR 17 measures 17 mm bore/Fw × 26 mm outside diameter × 25 mm width (0.669 × 1.024 × 0.984 in). From SKF catalogue PUB BU/P1 17000: radial dynamic rating C 12.1 kN, static C0 16.6 kN, fatigue limit Pu 1.96 kN, limiting speed 8,500 r/min, reference speed 4,300 r/min, mass about 50 g. Axial ratings of the thrust part: dynamic Ca 12.2 kN (Ca), static C0a 31.5 kN (C0a), minimum load factor A 0.000079; the thrust set carries load in one direction only.
How is the NKXR 17 designation read?
NKXR = needle roller radial part + full complement needle thrust part for a 17 mm shaft: 26 mm OD, 25 mm overall height, the highest axial rating of the combined needle families.
Can the NKXR 17 run on an unhardened shaft?
The radial needle part of the NKXR 17 runs directly on the 17 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. 7.10 needle roller / cylindrical-needle thrust on 2026-09-26. Read our editorial & correction policy.