NKXR35 bearing: complete specifications & equivalents
The NKXR35 is a DIN 616 radial bearing sized 35 x 47 x 30 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 35 mm |
| Outer diameter D | 47 mm |
| Width B | 30 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | none |
| Basic dynamic load rating C | 24.6 kN |
| Basic static load rating C0 | 45 kN |
| Fatigue load limit Pu | 5.6 kN |
| Reference speed (thermal) | 2800 rpm |
| Limiting speed (mechanical) | 5600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 160 g |
| Manufacturer designation | NKXR 35 |
| 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 | 1.378 in |
|---|---|
| Outer diameter D | 1.85 in |
| Width B | 1.181 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 6 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) | 6 of 9 |
| Bore above smallest NKXR-series size | 20 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NKXR35-Z | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 35×47×30 mm envelope and equivalent catalogue ratings; NKXR35-Z is the combined needle/thrust needle execution — boundary-dimension interchangeable, execution differences (seals, shields, cage) apply. |
| RNA6906 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 35×47×30 mm envelope, but catalogue C/C0 differ between the executions (24.6/45 vs 42.9/75 kN) — boundary dimensions match, not a load-rating equivalent. |
| NX35-Z | SKF | full Dimensions and internal design equivalent — standard interchange. | Envelope-identical (35×47×30 mm) combined needle/thrust ball execution with ratings within 10 % — substitution possible after checking ring/flange construction. |
| NX35 | SKF | full Dimensions and internal design equivalent — standard interchange. | Envelope-identical (35×47×30 mm) combined needle/thrust ball execution with ratings within 10 % — substitution possible after checking ring/flange construction. |
| NKX35-Z | SKF | full Dimensions and internal design equivalent — standard interchange. | Envelope-identical (35×47×30 mm) combined needle/thrust ball execution with ratings within 10 % — substitution possible after checking ring/flange construction. |
| NKX35 | SKF | full Dimensions and internal design equivalent — standard interchange. | Envelope-identical (35×47×30 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 NKXR35 model number is decoded
NKXR 35 is the heavy-thrust member of the combined needle roller family: 35 mm radial seat, 47 mm OD, and a full complement of thrust needles rated 29 kN (Ca) dynamic / 93 kN (C0a) static. The code NKXR 35 identifies the construction exactly — needle radial part, needle thrust part — for a 35 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 24.6 kN, radial C0 45 kN, axial dynamic 29 kN (Ca) and axial static 93 kN (C0a); combine them with the equivalent-load factors from the catalogue before checking L10. These units run at low speed with high axial load: verify lubricant channeling at the washer faces after the first hour, as the packed thrust set pumps grease axially out of the 30 mm tall envelope.
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
- electrical erosion on VFD-driven shafts without brush or insulated mounting
- thrust washer raceway wear from reverse axial shocks the one-direction thrust part cannot carry
Selection pitfalls — read before you substitute
- At 35 mm bore, verify shaft deflection against the needle length: these rollers tolerate little edge loading, and a simply supported span between 35 mm seats can bend past the compensation range long before the load rating is exhausted.
- Hardness is load capacity: in families without an inner ring the 35 mm journal must hold 58–64 HRC with a ground finish; a surface that looks fine but sits at 45 HRC will rib the raceway within weeks.
- The quoted 24.6/45 kN ratings are SKF catalogue values for this exact execution (NKXR 35); ratings can be revised without the order number changing, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the drawing.
- Minimum axial load is a real requirement: below factor A 0.00069 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 24.6/45 kN ratings and 160 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 are the dimensions and ratings of the NKXR 35?
A NKXR 35 measures 35 mm bore/Fw × 47 mm outside diameter × 30 mm width (1.378 × 1.85 × 1.181 in). From SKF catalogue PUB BU/P1 17000: radial dynamic rating C 24.6 kN, static C0 45 kN, fatigue limit Pu 5.6 kN, limiting speed 5,600 r/min, reference speed 2,800 r/min, mass about 160 g. Axial ratings of the thrust part: dynamic Ca 29 kN (Ca), static C0a 93 kN (C0a), minimum load factor A 0.00069; the thrust set carries load in one direction only.
How is the NKXR 35 designation read?
NKXR = needle roller radial part + full complement needle thrust part for a 35 mm shaft: 47 mm OD, 30 mm overall height, the highest axial rating of the combined needle families.
Can the NKXR 35 run on an unhardened shaft?
The radial needle part of the NKXR 35 runs directly on the 35 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.
How should the NKXR 35 be mounted?
Press on the ring faces only with a fitting sleeve, keep everything square to the 35 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. 7.10 needle roller / cylindrical-needle thrust on 2026-09-26. Read our editorial & correction policy.