NN3060 bearing: complete specifications & equivalents
The NN3060 is a ISO 15 radial bearing sized 300 x 460 x 118 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 300 mm |
| Outer diameter D | 460 mm |
| Width B | 118 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1470 kN |
| Basic static load rating C0 | 2560 kN |
| Fatigue load limit Pu | 209 kN |
| Limiting speed (mechanical) | 1200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 70800 g |
| Manufacturer designation | NTN NN3060 |
| 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 | 11.811 in |
|---|---|
| Outer diameter D | 18.11 in |
| Width B | 4.646 in |
| ISO bore code | 60 |
| Radial section height (D−d)/2 | 80 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) | 32 of 40 |
| Bore above smallest NN3000-series size | 275 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NN3060 | 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 NN3060 model number is decoded
For pure radial duty on a 300 mm shaft NTN supplies NN3060: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 1,200 r/min on grease and 1,500 r/min on oil. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 300 mm (00–03 use the 10/12/15/17 exception table). Double-row NN precision cylindrical roller bearing: ribbed inner ring with a separable outer ring, two roller rows for high radial stiffness on machine-tool spindles; precision classes P5/P4/P2 and clearance are ordered separately. Rating life at 1470 kN C assumes clean oil and adequate film; the 209 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Housing and shaft fillets must clear the ring chamfers of NN3060; an oversized radius locks the ring on its face and tilts the 118 mm-wide seat.
Typical equipment & failure modes
Common applications
- high-rpm motorised grinding and milling spindles
- CNC lathe and machining-centre spindle radial sets
- precision rotary-table and dividing-head bearings
- high-speed turbine and turbo-blower rotor supports
Known failure patterns
- roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load
- cage distortion after a mounting blow carried through the roller set
- roller-end and raceway scoring from inadequate oil flow under heavy radial load
- electrical pitting on VFD-driven motor shafts without grounding protection
- brinelling from static overload or impact during handling
Selection pitfalls — read before you substitute
- At 300 mm bore, oil-lubricated arrangements toward 1,500 r/min need positive flow and drain design; the 70800 g NN3060 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
- The 80.0 mm section at 300 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 118 mm-wide cavity.
- The 118 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 300 mm inner ring.
- Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3060 skids at 1,200 r/min and fails by smearing long before L10 fatigue.
- The 118 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 300 mm inner ring.
- The 1470/2560 kN ratings, 209 kN Pu and 70800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3060 (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 NN3060?
NN3060 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 300 mm bore, 460 mm OD and 118 mm width (11.811 × 18.11 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1470 kN, C0 2560 kN, Pu 209 kN, grease limiting speed 1,200 r/min, oil 1,500 r/min, mass about 70800 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. NN3060 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. NN3060 is supplied in the standard open execution shown in the table.
What does the K tapered bore mean on a precision NN bearing like NN3060?
NN3060 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat.
What speeds and lubrication apply to NN3060?
NTN rates NN3060 at 1,200 r/min with grease and 1,500 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.