NN3007K bearing: complete specifications & equivalents
The NN3007K is a ISO 15 radial bearing sized 35 x 62 x 20 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 35 mm |
| Outer diameter D | 62 mm |
| Width B | 20 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 42 kN |
| Basic static load rating C0 | 47.5 kN |
| Fatigue load limit Pu | 5.8 kN |
| Limiting speed (mechanical) | 11000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 235 g |
| Manufacturer designation | NTN NN3007K |
| 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 | 1.378 in |
|---|---|
| Outer diameter D | 2.441 in |
| Width B | 0.787 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 13.5 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) | 3 of 40 |
| Bore above smallest NN3000-series size | 10 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NN3007K | 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 NN3007K model number is decoded
NN3007K is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 35×62×20 mm ISO 15 envelope. Numbering ties NN3007K to its envelope: type code NN, series NN3000, 35 mm bore; the 62×20 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 42 kN and C0 47.5 kN (C0/C ≈ 1.13) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Selection arithmetic: Pu 5.8 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.13 (47.5/42 kN) shows the high-static-capacity proportioning of this 35 mm bore. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 35 mm shaft.
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
- fretting corrosion on a loose rotating shaft seat
- edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit
Selection pitfalls — read before you substitute
- On this 35 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NN3007K.
- Grease limiting speed 11,000 r/min and oil 13,000 r/min are different limits for NN3007K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.
- The 13.5 mm section at 35 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 20 mm-wide cavity.
- Open NN3007K 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 35 mm contact.
- Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3007K skids at 11,000 r/min and fails by smearing long before L10 fatigue.
- The 42/47.5 kN ratings, 5.8 kN Pu and 235 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3007K (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 NN3007K?
NN3007K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 35 mm bore, 62 mm OD and 20 mm width (1.378 × 2.441 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 42 kN, C0 47.5 kN, Pu 5.8 kN, grease limiting speed 11,000 r/min, oil 13,000 r/min, mass about 235 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. NN3007K 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. NN3007K is supplied in the standard open execution shown in the table.
What does the K tapered bore mean on a precision NN bearing like NN3007K?
The K suffix denotes a 1:12 tapered bore. NN3007K 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 NN3007 execution of the same envelope mounts on a plain seat.
What speeds and lubrication apply to NN3007K?
NTN rates NN3007K at 11,000 r/min with grease and 13,000 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.