NU1030 bearing: complete specifications & equivalents
The NU1030 is a ISO 15 radial bearing sized 150 x 225 x 35 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 150 mm |
| Outer diameter D | 225 mm |
| Width B | 35 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 224 kN |
| Basic static load rating C0 | 294 kN |
| Fatigue load limit Pu | 29.6 kN |
| Limiting speed (mechanical) | 3000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 4700 g |
| Manufacturer designation | NTN NU1030 |
| 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 | 5.906 in |
|---|---|
| Outer diameter D | 8.858 in |
| Width B | 1.378 in |
| ISO bore code | 30 |
| Radial section height (D−d)/2 | 37.5 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) | 22 of 47 |
| Bore above smallest NU1000-series size | 125 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NU1030-ML | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 150×225×35 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 NU1030 model number is decoded
NTN lists NU1030 on the 150×225 mm envelope, 35 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 3,000 r/min. Numbering ties NU1030 to its envelope: type code NU, series NU1000, 150 mm bore; the 225×35 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 3,500 r/min with oil versus 3,000 r/min with grease (a 500 r/min band), lubrication choice for NU1030 is a thermal decision, not just a sealing one. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. 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
- 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
- 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
- fretting corrosion on a loose rotating shaft seat
- brinelling from static overload or impact during handling
Selection pitfalls — read before you substitute
- At 150 mm bore, oil-lubricated arrangements toward 3,500 r/min need positive flow and drain design; the 4700 g NU1030 ring stores enough heat that grease-only duty needs a careful relubrication calculation.
- The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 224/294 kN pair here belongs to NU1030 as printed, not to the bare size.
- The 35 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 150 mm inner ring.
- The 35 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 150 mm inner ring.
- Grease limiting speed 3,000 r/min and oil 3,500 r/min are different limits for NU1030: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.
- The 224/294 kN ratings, 29.6 kN Pu and 4700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1030 (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 NU1030?
NU1030 is an NTN NU single-row cylindrical roller bearing to ISO 15: 150 mm bore, 225 mm OD and 35 mm width (5.906 × 8.858 × 1.378 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 224 kN, C0 294 kN, Pu 29.6 kN, grease limiting speed 3,000 r/min, oil 3,500 r/min, mass about 4700 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. NU1030 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. NU1030 is supplied in the standard open execution shown in the table.
Can NU1030 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 NU1030?
Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 169.5 mm, Ew 205.5 mm. The nominal bore/OD remain 150/225 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 3,000 r/min grease / 3,500 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.