RPNA20-35 bearing: complete specifications & equivalents
The RPNA20-35 is a DIN 616 radial bearing sized 20 x 35 x 16 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 20 mm |
| Outer diameter D | 35 mm |
| Width B | 16 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | none |
| Basic dynamic load rating C | 13.2 kN |
| Basic static load rating C0 | 19.3 kN |
| Fatigue load limit Pu | 2.28 kN |
| Reference speed (thermal) | 19000 rpm |
| Limiting speed (mechanical) | 22000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 62 g |
| Manufacturer designation | RPNA 20/35 |
| 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 | 0.787 in |
|---|---|
| Outer diameter D | 1.378 in |
| Width B | 0.63 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 7.5 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) | 3 of 8 |
| Bore above smallest RPNA-series size | 5 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the RPNA20-35 model number is decoded
RPNA 20/35 is a self-aligning needle roller bearing: a heavy machined outer ring with a convex outside surface seated against an aligning ring, absorbing housing misalignment around a 20 mm raceway, as listed in SKF catalogue PUB BU/P1 17000. In SKF nomenclature the P in RPNA flags the pivoting, sphered outer ring; dimensions 20×35×16 mm follow the heavy-section plan, and the inner ring decision is fixed by the family letter. Execution notes: alignment comes from the convex outer ring outside surface running in a plain sphered seat — no separate self-aligning washer is needed, and roughly ±2° of static seat error is absorbed. The 62 g catalogue mass and 7.5 mm radial section ((35−20)/2) frame a rating of about 0.66 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 20 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
- needle edge loading and raceway denting when the shaft deflects beyond the compensation range
- polymer cage deformation when the local temperature exceeds the 120 °C sustained limit
- abrasive paste formation from dust ingressing past open ends without effective housing seals
- corrosion pitting from condensation in intermittently operated machinery
Selection pitfalls — read before you substitute
- On a 20 mm seat the housing bore quality dominates life: a bore 0.02 mm out of round pinches the 35 mm ring or cup into a lobed shape, and the rollers then trace the housing's geometry error, not the design load.
- 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 interchange envelope-identical needle families blindly: RPNA 20/35 shares its 20×35×16 mm outline with inner-ring and sealed siblings whose ratings differ — the family letters are part of the specification, not decoration.
- The 13.2/19.3 kN ratings and 62 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
What does RPNA 20/35 mean in SKF part numbering?
RPNA marks the self-aligning needle roller family (with machined rings): figures give the 20 mm seat and 16 mm width; the convex outer-ring outside surface aligns within roughly ±2° in its sphered seat.
Does the RPNA 20/35 need a hardened and ground shaft?
Depends on the family member: RPNA runs directly on the shaft (hardened, 58–64 HRC, ground), while PNA includes a ground inner ring for an ordinary 20 mm k5 seat. Both add the sphered outer ring for seat misalignment.
What mounting mistakes ruin a RPNA 20/35?
Press on the ring faces only with a fitting sleeve, keep everything square to the 20 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.
Is the RPNA 20/35 sealed?
No — this execution is open and depends on the housing sealing arrangement; grease it at assembly and keep the relubrication interval short in dirty duty.
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.