RPNA35-52 bearing: complete specifications & equivalents
The RPNA35-52 is a DIN 616 radial bearing sized 35 x 52 x 20 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 | 52 mm |
| Width B | 20 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) | 11000 rpm |
| Limiting speed (mechanical) | 13000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 130 g |
| Manufacturer designation | RPNA 35/52 |
| Standard | DIN 616 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.5 alignment needle roller bearings, without an inner ring |
| Last verified | 2026-09-26 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.5 alignment needle roller bearings, without an inner ring) · extracted 2026-09-26
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.5 alignment needle roller bearings, without an inner ring); 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 & RPNA-series range
| Bore d | 1.378 in |
|---|---|
| Outer diameter D | 2.047 in |
| Width B | 0.787 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 8.5 mm |
| Smallest bore in RPNA-series | 15 mm |
| Largest outer diameter in RPNA-series | 62 mm |
| Width range across RPNA-series | 12–20 mm |
| Bore position in RPNA-series (smallest first) | 6 of 8 |
| Bore above smallest RPNA-series size | 20 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the RPNA35-52 model number is decoded
SKF supplies RPNA 35/52 for pivots whose housings distort under load: the needle roller ring rides on a spherical seat, keeping edge loads off the 20 mm wide roller complement. The code RPNA 35/52 reads as alignment needle roller bearing, 35 mm bore, 20 mm width — the wide section is what absorbs both load and the seat-angle errors the family is designed for. The alignment range is meant for static seat errors, not continuous swivelling under load — dynamic pivoting races the sphered surface and requires grease with extreme-pressure additives. The 130 g catalogue mass and 8.5 mm radial section ((52−35)/2) frame a rating of about 0.70 kN dynamic per millimetre of bore — the needle construction's density advantage over ball bearings of the same envelope. Mounting: seat the convex outer ring surface in its sphered counterpart dry first, confirm the 35 mm raceway rotates freely through the full alignment range, then lubricate and assemble for service.
Typical equipment & failure modes
Common applications
- linkage eyes and clevis mounts on frames that flex
- agricultural machinery joints exposed to frame distortion
- door and gate hinges with heavy radial load
- construction equipment blade and arm pivots
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
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.
- 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.
- The 24.6/45 kN ratings and 130 g mass are SKF catalogue values transcribed from ch. 7.5 of PUB BU/P1 17000 (PDF table page 650); combined-type axial ratings appear in the text above because the structured record carries radial values only.
Frequently asked questions
How should the RPNA 35/52 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.
What limits the service life of a RPNA 35/52?
Beyond the L10 rating, the practical limits are journal/raceway hardness for the 35 mm seat, lubricant condition at the roller ends, and contamination through open ends — the 8.5 mm radial section leaves no reserve once a raceway is dented or ribboned.
What are the dimensions and ratings of the RPNA 35/52?
A RPNA 35/52 measures 35 mm bore/Fw × 52 mm outside diameter × 20 mm width (1.378 × 2.047 × 0.787 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 13,000 r/min, reference speed 11,000 r/min, mass about 130 g.
How is the RPNA 35/52 designation read?
RPNA marks the self-aligning needle roller family (with machined rings): figures give the 35 mm seat and 20 mm width; the convex outer-ring outside surface aligns within roughly ±2° in its sphered seat.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.5 alignment needle roller bearings, without an inner ring on 2026-09-26. Read our editorial & correction policy.