NU1034 bearing: complete specifications & equivalents
The NU1034 is a ISO 15 radial bearing sized 170 x 260 x 42 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 170 mm |
| Outer diameter D | 260 mm |
| Width B | 42 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 310 kN |
| Basic static load rating C0 | 400 kN |
| Fatigue load limit Pu | 38.5 kN |
| Limiting speed (mechanical) | 2600 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 7760 g |
| Manufacturer designation | NTN NU1034 |
| 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 | 6.693 in |
|---|---|
| Outer diameter D | 10.236 in |
| Width B | 1.654 in |
| ISO bore code | 34 |
| Radial section height (D−d)/2 | 45 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) | 24 of 47 |
| Bore above smallest NU1000-series size | 145 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NU1034-ML | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 170×260×42 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 NU1034 model number is decoded
NU1034 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 310 kN dynamic rating in the 170 mm bore. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU1034 floats or locates; the numeric remainder is the ISO 15 series and 170 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 193 mm and Ew 237 mm — the envelope inside the 170/260 mm bore/OD where the rollers actually run. Speed ratio check: limiting 2,600 r/min is .87 of the 3,000 r/min oil value for NU1034; grease-churn heating closes that gap as fill quantity rises. Housing and shaft fillets must clear the ring chamfers of NU1034; an oversized radius locks the ring on its face and tilts the 42 mm-wide seat.
Typical equipment & failure modes
Common applications
- wind-turbine gearbox planet and rotor shafts
- ship propulsion line shafts and reduction gears
- mining SAG/ball-mill drive shafts
- offshore drawworks and winch drums
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
- roller-end and raceway scoring from inadequate oil flow under heavy radial load
- brinelling from static overload or impact during handling
- hard-particle indentation of raceways in unfiltered oil or open arrangements
Selection pitfalls — read before you substitute
- At 170 mm bore, oil-lubricated arrangements toward 3,000 r/min need positive flow and drain design; the 7760 g NU1034 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
- The 45.0 mm section at 170 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 42 mm-wide cavity.
- The 45.0 mm section at 170 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 42 mm-wide cavity.
- The 45.0 mm section at 170 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 42 mm-wide cavity.
- The NU rib arrangement is not interchangeable with another prefix on the same 170 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 260×42 mm envelope matches.
- The 310/400 kN ratings, 38.5 kN Pu and 7760 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1034 (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 NU1034?
NU1034 is an NTN NU single-row cylindrical roller bearing to ISO 15: 170 mm bore, 260 mm OD and 42 mm width (6.693 × 10.236 × 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 310 kN, C0 400 kN, Pu 38.5 kN, grease limiting speed 2,600 r/min, oil 3,000 r/min, mass about 7760 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. NU1034 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. NU1034 is supplied in the standard open execution shown in the table.
Can NU1034 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 NU1034?
Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm, Ew 237 mm. The nominal bore/OD remain 170/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,000 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.