RNA4860 bearing: complete specifications & equivalents
The RNA4860 is a ISO 1206 radial bearing sized 330 x 380 x 80 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 330 mm |
| Outer diameter D | 380 mm |
| Width B | 80 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | none |
| Basic dynamic load rating C | 594 kN |
| Basic static load rating C0 | 1800 kN |
| Fatigue load limit Pu | 173 kN |
| Reference speed (thermal) | 1100 rpm |
| Limiting speed (mechanical) | 1300 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 12500 g |
| Manufacturer designation | RNA 4860 |
| Standard | ISO 1206 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.3 machined rings with flanges, without an inner ring |
| Last verified | 2026-09-26 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018), ch. 7.3 machined rings with flanges, 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. 7.3 machined rings with flanges, 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 & RNA-48-series range
| Bore d | 12.992 in |
|---|---|
| Outer diameter D | 14.961 in |
| Width B | 3.15 in |
| ISO bore code | 60 |
| Radial section height (D−d)/2 | 25 mm |
| Smallest bore in RNA-48-series | 120 mm |
| Largest outer diameter in RNA-48-series | 480 mm |
| Width range across RNA-48-series | 30–100 mm |
| Bore position in RNA-48-series (smallest first) | 15 of 19 |
| Bore above smallest RNA-48-series size | 210 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| RNA4860-XL | FAG | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 330×380×80 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| RNA4860 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier. |
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 RNA4860 model number is decoded
RNA 4860 belongs to the machined-ring needle roller family: an outer ring turned and ground to 380 mm with two retaining flanges, a roller-and-cage set inside, and envelope 330×380×80 mm on a hardened 330 mm shaft. In SKF nomenclature RNA families drop the inner ring: the numbers after the letters give the 330 mm under-roller diameter and the 80 mm width, with the 380 mm outside diameter set by the dimension series 48 needle roller bearings without inner ring plan. The machined ring is through-hardened and ground on OD, bore-side raceway and faces; the flanged lip design means the housing shoulder can be omitted — the ring clamps axially between housing wall and cover washer. Catalogue mass 12500 g at 330×380×80 mm makes this one of the highest capacity-per-gram choices in the dimension series 48 needle roller bearings without inner ring; the limit is usually the shaft's ability to serve as a raceway, not the rolling contact itself. Grease through the housing groove before fitting the shaft; the integral flanges hold the grease film at the roller ends, which is where these bearings first starve.
Typical equipment & failure modes
Common applications
- cam followers built up from separate components
- crank pins and eccentrics where the hardened journal is the raceway
- gearbox planetary and idler gears on hardened pins
- piston-pin style pivots in hydraulic pumps
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
- smearing of rollers and journal during idle periods because the radial section holds too little lubricant
Selection pitfalls — read before you substitute
- Above 50 mm bore, thermal growth matters: the 330 mm inner ring or journal grows with temperature faster than the housing, and the small clearance of a needle roller contact leaves little reserve — check running clearance hot, not just at assembly.
- The quoted 594/1800 kN ratings are SKF catalogue values for this exact execution (RNA 4860); 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 594/1800 kN ratings and 12500 g mass are SKF catalogue values transcribed from ch. 7.3 of PUB BU/P1 17000 (PDF table page 636); combined-type axial ratings appear in the text above because the structured record carries radial values only.
Frequently asked questions
Which dimensions does the RNA 4860 have?
A RNA 4860 measures 330 mm bore/Fw × 380 mm outside diameter × 80 mm width (12.992 × 14.961 × 3.15 in). From SKF catalogue PUB BU/P1 17000: radial dynamic rating C 594 kN, static C0 1800 kN, fatigue limit Pu 173 kN, limiting speed 1,300 r/min, reference speed 1,100 r/min, mass about 12500 g.
What does RNA 4860 mean in SKF part numbering?
RNA names a machined-ring needle roller bearing without inner ring: the figures give Fw 330 mm and width 80 mm, OD 380 mm comes from the dimension series, and the flanged outer ring retains the caged rollers.
Does the RNA 4860 need a hardened and ground shaft?
No. In this execution the 330 mm shaft journal is the inner raceway: it must be ground and hardened to 58–64 HRC (with matching housing bore quality on the outside). If the shaft cannot meet that, order the inner-ring sibling (NKI/NA execution) plus its ground inner ring instead.
What mounting mistakes ruin a RNA 4860?
Press on the ring faces only with a fitting sleeve, keep everything square to the 330 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. 7.3 machined rings with flanges, without an inner ring on 2026-09-26. Read our editorial & correction policy.