N1011 bearing: complete specifications & equivalents
The N1011 is a ISO 15 radial bearing sized 55 x 90 x 18 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 55 mm |
| Outer diameter D | 90 mm |
| Width B | 18 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 | 44 kN |
| Fatigue load limit Pu | 5.35 kN |
| Limiting speed (mechanical) | 8200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 435 g |
| Manufacturer designation | NTN N1011 |
| 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 & N1000-series range
| Bore d | 2.165 in |
|---|---|
| Outer diameter D | 3.543 in |
| Width B | 0.709 in |
| ISO bore code | 11 |
| Radial section height (D−d)/2 | 17.5 mm |
| Smallest bore in N1000-series | 25 mm |
| Largest outer diameter in N1000-series | 720 mm |
| Width range across N1000-series | 12–100 mm |
| Bore position in N1000-series (smallest first) | 7 of 42 |
| Bore above smallest N1000-series size | 30 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| N1011 | 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 N1011 model number is decoded
N1011 is the extra-light (10/49) section of the NTN N1000 dimension series for a 55 mm shaft — 42 kN of basic dynamic capacity in a 435 g, open bearing. Digit by digit, N1011 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 55 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: 8,200 r/min grease and 9,700 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 55 mm bore. The 0.8 kN-per-mm-bore figure (42 kN over 55 mm) lets a N1011 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 55 mm shaft.
Typical equipment & failure modes
Common applications
- papermaking and printing auxiliary drives
- fan and blower rotor positions
- industrial gearbox input and output shafts
- medium electric-motor and generator shafts
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
- roller-end and raceway scoring from inadequate oil flow under heavy radial load
- electrical pitting on VFD-driven motor shafts without grounding protection
- fretting corrosion on a loose rotating shaft seat
Selection pitfalls — read before you substitute
- On this 55 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 N1011.
- If the shaft must be located both ways, do not use N1011 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.
- The N rib arrangement is not interchangeable with another prefix on the same 55 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 90×18 mm envelope matches.
- Open N1011 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 55 mm contact.
- If the shaft must be located both ways, do not use N1011 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.
- The 42/44 kN ratings, 5.35 kN Pu and 435 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1011 (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 N1011?
N1011 is an NTN N single-row cylindrical roller bearing to ISO 15: 55 mm bore, 90 mm OD and 18 mm width (2.165 × 3.543 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 42 kN, C0 44 kN, Pu 5.35 kN, grease limiting speed 8,200 r/min, oil 9,700 r/min, mass about 435 g. It is open, with a pressed sheet-steel cage.
What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?
The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1011 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side.
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. N1011 is supplied in the standard open execution shown in the table.
Can N1011 take axial load and locate a shaft?
the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set).
What do Fw and Ew mean for N1011?
Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 64.5 mm, Ew 80.5 mm. The nominal bore/OD remain 55/90 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 8,200 r/min grease / 9,700 r/min oil.
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.