NN3038 bearing: complete specifications & equivalents
The NN3038 is a ISO 15 radial bearing sized 190 x 290 x 75 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 190 mm |
| Outer diameter D | 290 mm |
| Width B | 75 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 640 kN |
| Basic static load rating C0 | 1040 kN |
| Fatigue load limit Pu | 97 kN |
| Limiting speed (mechanical) | 2000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 18000 g |
| Manufacturer designation | NTN NN3038 |
| 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 | 7.48 in |
|---|---|
| Outer diameter D | 11.417 in |
| Width B | 2.953 in |
| ISO bore code | 38 |
| Radial section height (D−d)/2 | 50 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) | 26 of 40 |
| Bore above smallest NN3000-series size | 165 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NN3038 | 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 NN3038 model number is decoded
NN3038 is the standard section of the NTN NN3000 dimension series for a 190 mm shaft — 640 kN of basic dynamic capacity in a 18000 g, open bearing. Digit by digit, NN3038 reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 190 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 2,000 r/min grease and 2,400 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 190 mm bore. The 190 mm (7.48 in) bore and 290 mm (11.417 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 75 mm-wide ring. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 190 mm shaft.
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
- 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
- electrical pitting on VFD-driven motor shafts without grounding protection
- hard-particle indentation of raceways in unfiltered oil or open arrangements
Selection pitfalls — read before you substitute
- At 190 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the 18000 g NN3038 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
- The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 640/1040 kN pair here belongs to NN3038 as printed, not to the bare size.
- Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN3038 does not substitute a precision-class execution.
- Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3038 skids at 2,000 r/min and fails by smearing long before L10 fatigue.
- Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN3038 does not substitute a precision-class execution.
- The 640/1040 kN ratings, 97 kN Pu and 18000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3038 (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 NN3038?
NN3038 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 190 mm bore, 290 mm OD and 75 mm width (7.48 × 11.417 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 640 kN, C0 1040 kN, Pu 97 kN, grease limiting speed 2,000 r/min, oil 2,400 r/min, mass about 18000 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. NN3038 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. NN3038 is supplied in the standard open execution shown in the table.
What does the K tapered bore mean on a precision NN bearing like NN3038?
NN3038 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 NN3038?
NTN rates NN3038 at 2,000 r/min with grease and 2,400 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.