NN3064 bearing: complete specifications & equivalents
The NN3064 is a ISO 15 radial bearing sized 320 x 480 x 121 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 320 mm |
| Outer diameter D | 480 mm |
| Width B | 121 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1500 kN |
| Basic static load rating C0 | 2670 kN |
| Fatigue load limit Pu | 214 kN |
| Limiting speed (mechanical) | 1100 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 76200 g |
| Manufacturer designation | NTN NN3064 |
| 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 | 12.598 in |
|---|---|
| Outer diameter D | 18.898 in |
| Width B | 4.764 in |
| ISO bore code | 64 |
| 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) | 33 of 40 |
| Bore above smallest NN3000-series size | 295 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NN3064 | 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 NN3064 model number is decoded
In NTN Ball and Roller Bearings CAT.No.2203E, NN3064 appears as a 320 mm bore single-row cylindrical roller bearing (1500 kN C / 2670 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. Numbering ties NN3064 to its envelope: type code NN, series NN3000, 320 mm bore; the 480×121 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 NN3064 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 1,100 r/min grease ceiling should include the cage type (a machined or stamped steel cage per the precision execution) and oil-flow option to 1,300 r/min for continuously high-duty 320 mm positions. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 320 mm shaft.
Typical equipment & failure modes
Common applications
- CNC lathe and machining-centre spindle radial sets
- precision rotary-table and dividing-head bearings
- high-speed turbine and turbo-blower rotor supports
- coordinate-measuring and semiconductor-equipment drives
Known failure patterns
- roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load
- cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance
- micro-pitting when the EHL film falls below the composite roughness at high specific load
- hard-particle indentation of raceways in unfiltered oil or open arrangements
- hard-particle indentation of raceways in unfiltered oil or open arrangements
Selection pitfalls — read before you substitute
- At 320 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 76200 g NN3064 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
- Wide (22/23) and light (10/49) executions at 320 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 80.0 mm section at 320 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 121 mm-wide cavity.
- Do not replace NN3064 with a deep-groove ball bearing on rating alone: line contact gives 1500 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.
- Do not replace NN3064 with a deep-groove ball bearing on rating alone: line contact gives 1500 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 1500/2670 kN ratings, 214 kN Pu and 76200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3064 (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 NN3064?
NN3064 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 320 mm bore, 480 mm OD and 121 mm width (12.598 × 18.898 × 4.764 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1500 kN, C0 2670 kN, Pu 214 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 76200 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. NN3064 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. NN3064 is supplied in the standard open execution shown in the table.
What does the K tapered bore mean on a precision NN bearing like NN3064?
NN3064 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 NN3064?
NTN rates NN3064 at 1,100 r/min with grease and 1,300 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.