NN3076 bearing: complete specifications & equivalents
The NN3076 is a ISO 15 radial bearing sized 380 x 560 x 135 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 380 mm |
| Outer diameter D | 560 mm |
| Width B | 135 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 1870 kN |
| Basic static load rating C0 | 3450 kN |
| Fatigue load limit Pu | 265 kN |
| Limiting speed (mechanical) | 940 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 113000 g |
| Manufacturer designation | NTN NN3076 |
| 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 | 14.961 in |
|---|---|
| Outer diameter D | 22.047 in |
| Width B | 5.315 in |
| ISO bore code | 76 |
| Radial section height (D−d)/2 | 90 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) | 36 of 40 |
| Bore above smallest NN3000-series size | 355 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NN3076 | 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 NN3076 model number is decoded
NN3076 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1870 kN dynamic rating in the 380 mm bore. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN3076 floats or locates; the numeric remainder is the ISO 15 series and 380 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NN3076 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Equivalent-load planning treats NN3076 as a pure radial bearing: keep P below 1870 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. 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 NN3076.
Typical equipment & failure modes
Common applications
- precision gearbox and indexing-drive shafts
- high-rpm motorised grinding and milling spindles
- CNC lathe and machining-centre spindle radial sets
- precision rotary-table and dividing-head bearings
Known failure patterns
- inner-ring raceway spalling from overload in the line-contact Hertzian zone
- 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
- fretting corrosion on a loose rotating shaft seat
Selection pitfalls — read before you substitute
- At 380 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 113000 g NN3076 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
- Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3076 skids at 940 r/min and fails by smearing long before L10 fatigue.
- The 90.0 mm section at 380 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 135 mm-wide cavity.
- The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1870/3450 kN pair here belongs to NN3076 as printed, not to the bare size.
- Wide (22/23) and light (10/49) executions at 380 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 1870/3450 kN ratings, 265 kN Pu and 113000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3076 (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 NN3076?
NN3076 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 380 mm bore, 560 mm OD and 135 mm width (14.961 × 22.047 × 5.315 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1870 kN, C0 3450 kN, Pu 265 kN, grease limiting speed 940 r/min, oil 1,100 r/min, mass about 113000 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. NN3076 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. NN3076 is supplied in the standard open execution shown in the table.
What does the K tapered bore mean on a precision NN bearing like NN3076?
NN3076 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 NN3076?
NTN rates NN3076 at 940 r/min with grease and 1,100 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.