N1048 bearing: complete specifications & equivalents
The N1048 is a ISO 15 radial bearing sized 240 x 360 x 56 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 240 mm |
| Outer diameter D | 360 mm |
| Width B | 56 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 585 kN |
| Basic static load rating C0 | 820 kN |
| Fatigue load limit Pu | 72 kN |
| Limiting speed (mechanical) | 1800 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 19300 g |
| Manufacturer designation | NTN N1048 |
| 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 | 9.449 in |
|---|---|
| Outer diameter D | 14.173 in |
| Width B | 2.205 in |
| ISO bore code | 48 |
| Radial section height (D−d)/2 | 60 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) | 29 of 42 |
| Bore above smallest N1000-series size | 215 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| N1048 | 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 N1048 model number is decoded
The NTN order number N1048 denotes a 240×360×56 mm (9.449 × 14.173 × 2.205 in) cylindrical roller bearing in the N1000 family, a pressed sheet-steel cage. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 240 mm (00–03 use the 10/12/15/17 exception table). Minimum radial load matters: an unloaded N1048 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Selection arithmetic: Pu 72 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.40 (820/585 kN) shows the high-static-capacity proportioning of this 240 mm bore. Heat the inner ring to max 120 °C for the 240 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.
Typical equipment & failure modes
Common applications
- large turbine and generator rotor bearings
- wind-turbine gearbox planet and rotor shafts
- ship propulsion line shafts and reduction gears
- mining SAG/ball-mill drive shafts
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
- micro-pitting when the EHL film falls below the composite roughness at high specific load
- edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit
- electrical pitting on VFD-driven motor shafts without grounding protection
Selection pitfalls — read before you substitute
- At 240 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the 19300 g N1048 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
- Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 360 mm race brinells and releases as vibration within hours.
- Do not replace N1048 with a deep-groove ball bearing on rating alone: line contact gives 585 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.
- Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N1048 skids at 1,800 r/min and fails by smearing long before L10 fatigue.
- Do not replace N1048 with a deep-groove ball bearing on rating alone: line contact gives 585 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 585/820 kN ratings, 72 kN Pu and 19300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1048 (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 N1048?
N1048 is an NTN N single-row cylindrical roller bearing to ISO 15: 240 mm bore, 360 mm OD and 56 mm width (9.449 × 14.173 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 585 kN, C0 820 kN, Pu 72 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min, mass about 19300 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. N1048 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. N1048 is supplied in the standard open execution shown in the table.
Can N1048 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 N1048?
Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 270 mm, Ew 330 mm. The nominal bore/OD remain 240/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 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.