NN3080 bearing: complete specifications & equivalents
The NN3080 is a ISO 15 radial bearing sized 400 x 600 x 148 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 400 mm |
| Outer diameter D | 600 mm |
| Width B | 148 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 2260 kN |
| Basic static load rating C0 | 4150 kN |
| Fatigue load limit Pu | 310 kN |
| Limiting speed (mechanical) | 880 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 146000 g |
| Manufacturer designation | NTN NN3080 |
| 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 | 15.748 in |
|---|---|
| Outer diameter D | 23.622 in |
| Width B | 5.827 in |
| ISO bore code | 80 |
| Radial section height (D−d)/2 | 100 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) | 37 of 40 |
| Bore above smallest NN3000-series size | 375 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NN3080 | 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 NN3080 model number is decoded
NN3080 is the standard section of the NTN NN3000 dimension series for a 400 mm shaft — 2260 kN of basic dynamic capacity in a 146000 g, open bearing. Numbering ties NN3080 to its envelope: type code NN, series NN3000, 400 mm bore; the 600×148 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NN3080 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Selection arithmetic: Pu 310 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.84 (4150/2260 kN) shows the high-static-capacity proportioning of this 400 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NN3080.
Typical equipment & failure modes
Common applications
- precision rotary-table and dividing-head bearings
- high-speed turbine and turbo-blower rotor supports
- coordinate-measuring and semiconductor-equipment drives
- machine-tool main spindles requiring high radial stiffness
Known failure patterns
- roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load
- 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
- brinelling from static overload or impact during handling
- fretting corrosion on a loose rotating shaft seat
Selection pitfalls — read before you substitute
- At 400 mm bore, oil-lubricated arrangements toward 1,000 r/min need positive flow and drain design; the 146000 g NN3080 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
- Open NN3080 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 400 mm contact.
- The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 2260/4150 kN pair here belongs to NN3080 as printed, not to the bare size.
- The 148 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 400 mm inner ring.
- Do not replace NN3080 with a deep-groove ball bearing on rating alone: line contact gives 2260 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.
- The 2260/4150 kN ratings, 310 kN Pu and 146000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3080 (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 NN3080?
NN3080 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 400 mm bore, 600 mm OD and 148 mm width (15.748 × 23.622 × 5.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2260 kN, C0 4150 kN, Pu 310 kN, grease limiting speed 880 r/min, oil 1,000 r/min, mass about 146000 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. NN3080 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. NN3080 is supplied in the standard open execution shown in the table.
What does the K tapered bore mean on a precision NN bearing like NN3080?
NN3080 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 NN3080?
NTN rates NN3080 at 880 r/min with grease and 1,000 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.