RPNA15-28 bearing: complete specifications & equivalents
The RPNA15-28 is a DIN 616 radial bearing sized 15 x 28 x 12 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 | 28 mm |
| Width B | 12 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | none |
| Basic dynamic load rating C | 7.37 kN |
| Basic static load rating C0 | 9.15 kN |
| Fatigue load limit Pu | 1.08 kN |
| Reference speed (thermal) | 24000 rpm |
| Limiting speed (mechanical) | 28000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 32 g |
| Manufacturer designation | RPNA 15/28 |
| 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 | 0.591 in |
|---|---|
| Outer diameter D | 1.102 in |
| Width B | 0.472 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 6.5 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) | 1 of 8 |
| Bore above smallest RPNA-series size | 0 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the RPNA15-28 model number is decoded
Where a plain needle roller bearing would edge-load on a bent frame, RPNA 15/28 from the self-aligning needle roller bearings without inner ring aligns itself: 15 mm bore, 28 mm sphered outside diameter, 12 mm width. Reading the designation: RPNA marks the self-aligning execution ( inner ring), the numbers giving 15 mm bore and 12 mm width; the sphered outside diameter 28 mm follows the series plan. 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. Speed planning separates the two ceilings: 24,000 r/min thermal reference and 28,000 r/min mechanical limiting — needle bearings tolerate high rpm only with adequate lubricant film at the 15 mm seat. Retain the ring axially with washers spanning the full outside surface; point clamps that dig into the sphered surface flatten it and spoil the alignment travel.
Typical equipment & failure modes
Common applications
- pivot bearings where housing bores cannot be kept coaxial
- linkage eyes and clevis mounts on frames that flex
- agricultural machinery joints exposed to frame distortion
- door and gate hinges with heavy radial load
Known failure patterns
- needle edge loading and raceway denting when the shaft deflects beyond the compensation range
- 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
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 28 mm ring or cup into a lobed shape, and the rollers then trace the housing's geometry error, not the design load.
- The quoted 7.37/9.15 kN ratings are SKF catalogue values for this exact execution (RPNA 15/28); ratings can be revised without the order number changing, so keep the catalogue version (SKF catalogue PUB BU/P1 17000) with the drawing.
- 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.
- The 7.37/9.15 kN ratings and 32 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
Which dimensions does the RPNA 15/28 have?
A RPNA 15/28 measures 15 mm bore/Fw × 28 mm outside diameter × 12 mm width (0.591 × 1.102 × 0.472 in). From SKF catalogue PUB BU/P1 17000: radial dynamic rating C 7.37 kN, static C0 9.15 kN, fatigue limit Pu 1.08 kN, limiting speed 28,000 r/min, reference speed 24,000 r/min, mass about 32 g.
What does RPNA 15/28 mean in SKF part numbering?
RPNA marks the self-aligning needle roller family (with machined rings): figures give the 15 mm seat and 12 mm width; the convex outer-ring outside surface aligns within roughly ±2° in its sphered seat.
Does the RPNA 15/28 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 15 mm k5 seat. Both add the sphered outer ring for seat misalignment.
What mounting mistakes ruin a RPNA 15/28?
Press on the ring faces only with a fitting sleeve, keep everything square to the 15 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. 7.5 alignment needle roller bearings, without an inner ring on 2026-09-26. Read our editorial & correction policy.