N1028 bearing: complete specifications & equivalents
The N1028 is a ISO 15 radial bearing sized 140 x 210 x 33 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 140 mm |
| Outer diameter D | 210 mm |
| Width B | 33 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 195 kN |
| Basic static load rating C0 | 250 kN |
| Fatigue load limit Pu | 25.7 kN |
| Limiting speed (mechanical) | 3200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 3980 g |
| Manufacturer designation | NTN N1028 |
| 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 | 5.512 in |
|---|---|
| Outer diameter D | 8.268 in |
| Width B | 1.299 in |
| ISO bore code | 28 |
| Radial section height (D−d)/2 | 35 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) | 21 of 42 |
| Bore above smallest N1000-series size | 115 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| N1028 | 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 N1028 model number is decoded
N1028 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 195 kN dynamic rating in the 140 mm bore. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 140 mm, with 210 mm OD and 33 mm width from the ISO 15 general plan. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full N1028 designation when purchasing. Rating life at 195 kN C assumes clean oil and adequate film; the 25.7 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.
Typical equipment & failure modes
Common applications
- heavy press and large gearbox main shafts
- rolling-mill work-roll and backup-roll positions
- large turbine and generator rotor bearings
- wind-turbine gearbox planet and rotor shafts
Known failure patterns
- inner-ring raceway spalling from overload in the line-contact Hertzian zone
- cage distortion after a mounting blow carried through the roller set
- grease starvation and cage drag when relubrication intervals are extended past the grease life
- rolling-contact fatigue after the catalogue L10 life is exceeded
- hard-particle indentation of raceways in unfiltered oil or open arrangements
Selection pitfalls — read before you substitute
- At 140 mm bore, oil-lubricated arrangements toward 3,800 r/min need positive flow and drain design; the 3980 g N1028 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
- If the shaft must be located both ways, do not use N1028 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.
- Grease limiting speed 3,200 r/min and oil 3,800 r/min are different limits for N1028: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.
- The 35.0 mm section at 140 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 33 mm-wide cavity.
- The 33 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 140 mm inner ring.
- The 195/250 kN ratings, 25.7 kN Pu and 3980 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1028 (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 N1028?
N1028 is an NTN N single-row cylindrical roller bearing to ISO 15: 140 mm bore, 210 mm OD and 33 mm width (5.512 × 8.268 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 195 kN, C0 250 kN, Pu 25.7 kN, grease limiting speed 3,200 r/min, oil 3,800 r/min, mass about 3980 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. N1028 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. N1028 is supplied in the standard open execution shown in the table.
Can N1028 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 N1028?
Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 158 mm, Ew 192 mm. The nominal bore/OD remain 140/210 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,200 r/min grease / 3,800 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.