NU1048 bearing: complete specifications & equivalents
The NU1048 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 NU1048 |
| 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 & NU1000-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 NU1000-series | 25 mm |
| Largest outer diameter in NU1000-series | 1090 mm |
| Width range across NU1000-series | 12–150 mm |
| Bore position in NU1000-series (smallest first) | 29 of 47 |
| Bore above smallest NU1000-series size | 215 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NU1048-ML | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 240×360×56 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
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 NU1048 model number is decoded
NU1048 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 585 kN dynamic rating in the 240 mm bore. Numbering ties NU1048 to its envelope: type code NU, series NU1000, 240 mm bore; the 360×56 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 1,800 r/min grease and 2,100 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 240 mm bore. The 240 mm (9.449 in) bore and 360 mm (14.173 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 56 mm-wide ring. On NU 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
- mining SAG/ball-mill drive shafts
- offshore drawworks and winch drums
- heavy press and large gearbox main shafts
- rolling-mill work-roll and backup-roll positions
Known failure patterns
- roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load
- cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance
- grease starvation and cage drag when relubrication intervals are extended past the grease life
- rolling-contact fatigue after the catalogue L10 life is exceeded
- brinelling from static overload or impact during handling
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 NU1048 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
- Open NU1048 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 240 mm contact.
- Do not replace NU1048 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 EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 585/820 kN pair here belongs to NU1048 as printed, not to the bare size.
- If the shaft must be located both ways, do not use NU1048 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.
- The 585/820 kN ratings, 72 kN Pu and 19300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1048 (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 NU1048?
NU1048 is an NTN NU 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. NU1048 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially.
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. NU1048 is supplied in the standard open execution shown in the table.
Can NU1048 take axial load and locate a shaft?
the NU design carries no axial load and floats axially on both sides. 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 NU1048?
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.