NN3013K bearing: complete specifications & equivalents
The NN3013K is a ISO 15 radial bearing sized 65 x 100 x 26 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 65 mm |
| Outer diameter D | 100 mm |
| Width B | 26 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 83 kN |
| Basic static load rating C0 | 111 kN |
| Fatigue load limit Pu | 13.6 kN |
| Limiting speed (mechanical) | 6200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 735 g |
| Manufacturer designation | NTN NN3013K |
| 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 | 2.559 in |
|---|---|
| Outer diameter D | 3.937 in |
| Width B | 1.024 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 17.5 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) | 9 of 40 |
| Bore above smallest NN3000-series size | 40 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NN3013K | 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 NN3013K model number is decoded
For pure radial duty on a 65 mm shaft NTN supplies NN3013K: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 6,200 r/min on grease and 7,300 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 = 65 mm (00–03 use the 10/12/15/17 exception table). Minimum radial load matters: an unloaded NN3013K at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Thermal planning around the 6,200 r/min grease ceiling should include the cage type (a machined or stamped steel cage per the precision execution) and oil-flow option to 7,300 r/min for continuously high-duty 65 mm positions. 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 NN3013K.
Typical equipment & failure modes
Common applications
- coordinate-measuring and semiconductor-equipment drives
- machine-tool main spindles requiring high radial stiffness
- precision gearbox and indexing-drive shafts
- high-rpm motorised grinding and milling spindles
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
- roller-end and raceway scoring from inadequate oil flow under heavy radial load
- edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit
- hard-particle indentation of raceways in unfiltered oil or open arrangements
Selection pitfalls — read before you substitute
- Induction-heat the 65 mm inner ring (max 120 °C) and mount it before fitting the outer ring; the ring mass makes square guidance essential — driving through the rollers brinells the 100 mm raceway.
- Grease limiting speed 6,200 r/min and oil 7,300 r/min are different limits for NN3013K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.
- The NN rib arrangement is not interchangeable with another prefix on the same 65 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 100×26 mm envelope matches.
- The 17.5 mm section at 65 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 26 mm-wide cavity.
- Do not replace NN3013K with a deep-groove ball bearing on rating alone: line contact gives 83 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 83/111 kN ratings, 13.6 kN Pu and 735 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3013K (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 NN3013K?
NN3013K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 65 mm bore, 100 mm OD and 26 mm width (2.559 × 3.937 × 1.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 83 kN, C0 111 kN, Pu 13.6 kN, grease limiting speed 6,200 r/min, oil 7,300 r/min, mass about 735 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. NN3013K 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. NN3013K is supplied in the standard open execution shown in the table.
What does the K tapered bore mean on a precision NN bearing like NN3013K?
The K suffix denotes a 1:12 tapered bore. NN3013K 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 NN3013 execution of the same envelope mounts on a plain seat.
What speeds and lubrication apply to NN3013K?
NTN rates NN3013K at 6,200 r/min with grease and 7,300 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.