NN3092K bearing: complete specifications & equivalents
The NN3092K is a ISO 15 radial bearing sized 460 x 680 x 163 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 460 mm |
| Outer diameter D | 680 mm |
| Width B | 163 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 2830 kN |
| Basic static load rating C0 | 5350 kN |
| Fatigue load limit Pu | 385 kN |
| Limiting speed (mechanical) | 750 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 195000 g |
| Manufacturer designation | NTN NN3092K |
| Standard | ISO 15 |
| Catalog version | NTN Ball and Roller Bearings CAT.No.2203E |
| Last verified | 2026-10-01 |
Source: catalog reference (NTN Ball and Roller Bearings CAT.No.2203E) · extracted 2026-10-01
Parameters extracted from the official NTN Ball and Roller Bearings catalogue (NTN Ball and Roller Bearings CAT.No.2203E); NTN® is a trademark of NTN Corporation, used here for identification only — mpnbase is not an authorized NTN distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at ntnglobal.com.
Dimensions in inches & NN3000-series range
| Bore d | 18.11 in |
|---|---|
| Outer diameter D | 26.772 in |
| Width B | 6.417 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 110 mm |
| Smallest bore in NN3000-series | 25 mm |
| Largest outer diameter in NN3000-series | 680 mm |
| Width range across NN3000-series | 16–163 mm |
| Bore position in NN3000-series (smallest first) | 40 of 40 |
| Bore above smallest NN3000-series size | 435 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NN3092K | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; brand-specific OEM equivalents (NSK/FAG/NTN) pending multi-source data. |
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 NN3092K model number is decoded
The NTN order number NN3092K denotes a 460×680×163 mm (18.11 × 26.772 × 6.417 in) cylindrical roller bearing in the NN3000 family, a machined or stamped steel cage per the precision execution. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 460 mm, with 680 mm OD and 163 mm width from the ISO 15 general plan. Line contact between rollers and raceways gives NN3092K high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Speed ratio check: limiting 750 r/min is .84 of the 890 r/min oil value for NN3092K; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NN3092K non-locating position preloads the bearing when the shaft grows.
Typical equipment & failure modes
Common applications
- high-speed turbine and turbo-blower rotor supports
- coordinate-measuring and semiconductor-equipment drives
- machine-tool main spindles requiring high radial stiffness
- precision gearbox and indexing-drive shafts
Known failure patterns
- inner-ring raceway spalling from overload in the line-contact Hertzian zone
- pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant
- grease starvation and cage drag when relubrication intervals are extended past the grease life
- false brinelling on standby machines exposed to external vibration
- edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit
Selection pitfalls — read before you substitute
- At 460 mm bore, oil-lubricated arrangements toward 890 r/min need positive flow and drain design; the 195000 g NN3092K ring stores enough heat that grease-only duty needs a careful relubrication calculation.
- Do not replace NN3092K with a deep-groove ball bearing on rating alone: line contact gives 2830 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.
- Grease limiting speed 750 r/min and oil 890 r/min are different limits for NN3092K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.
- Do not replace NN3092K with a deep-groove ball bearing on rating alone: line contact gives 2830 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.
- Wide (22/23) and light (10/49) executions at 460 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.
- The 2830/5350 kN ratings, 385 kN Pu and 195000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3092K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives.
Frequently asked questions
What are the dimensions and catalogue data of NN3092K?
NN3092K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 460 mm bore, 680 mm OD and 163 mm width (18.11 × 26.772 × 6.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2830 kN, C0 5350 kN, Pu 385 kN, grease limiting speed 750 r/min, oil 890 r/min, mass about 195000 g. It is open, with a machined or stamped steel cage per the precision execution.
What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?
NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3092K is the NN execution.
What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?
EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3092K is supplied in the standard open execution shown in the table.
What does the K tapered bore mean on a precision NN bearing like NN3092K?
The K suffix denotes a 1:12 tapered bore. NN3092K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3092 execution of the same envelope mounts on a plain seat.
What speeds and lubrication apply to NN3092K?
NTN rates NN3092K at 750 r/min with grease and 890 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone.
Reviewed & verified by the MPN Base engineering desk against source catalog NTN Ball and Roller Bearings CAT.No.2203E on 2026-10-01. Read our editorial & correction policy.