NU1009 bearing: complete specifications & equivalents
The NU1009 is a ISO 15 radial bearing sized 45 x 75 x 16 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | NTN |
| Bore diameter d | 45 mm |
| Outer diameter D | 75 mm |
| Width B | 16 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Basic dynamic load rating C | 34.5 kN |
| Basic static load rating C0 | 34 kN |
| Fatigue load limit Pu | 4.1 kN |
| Limiting speed (mechanical) | 9900 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 276 g |
| Manufacturer designation | NTN NU1009 |
| 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 | 1.772 in |
|---|---|
| Outer diameter D | 2.953 in |
| Width B | 0.63 in |
| ISO bore code | 09 |
| Radial section height (D−d)/2 | 15 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) | 5 of 47 |
| Bore above smallest NU1000-series size | 20 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| NU1009-ECP | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 45×75×16 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 NU1009 model number is decoded
NTN lists NU1009 on the 45×75 mm envelope, 16 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 9,900 r/min. Digit by digit, NU1009 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 45 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 16 mm width and 15.0 mm section put the NU1000 series in the extra-light (10/49) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Selection arithmetic: Pu 4.1 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 0.99 (34/34.5 kN) shows the high-static-capacity proportioning of this 45 mm bore. Heat the inner ring to max 120 °C for the 45 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
- pump and compressor crankshafts and rotors
- machine-tool gearbox and spindle radial sets
- material-handling drum and wheel shafts
- papermaking and printing auxiliary drives
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
- electrical pitting on VFD-driven motor shafts without grounding protection
- fretting corrosion on a loose rotating shaft seat
Selection pitfalls — read before you substitute
- On this 45 mm bore, shaft thermal growth can preload the inner ring if the fit is too tight; verify residual interference at temperature and confirm the float ring still slides after mounting NU1009.
- Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full NU1000 series code before substituting, because housing and shoulder geometry will not interchange.
- The 15.0 mm section at 45 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 16 mm-wide cavity.
- Wide (22/23) and light (10/49) executions at 45 mm bore share bore but not OD/width; check the full NU1000 series code before substituting, because housing and shoulder geometry will not interchange.
- Open NU1009 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 45 mm contact.
- The 34.5/34 kN ratings, 4.1 kN Pu and 276 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1009 (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 NU1009?
NU1009 is an NTN NU single-row cylindrical roller bearing to ISO 15: 45 mm bore, 75 mm OD and 16 mm width (1.772 × 2.953 × 0.63 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 34.5 kN, C0 34 kN, Pu 4.1 kN, grease limiting speed 9,900 r/min, oil 12,000 r/min, mass about 276 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. NU1009 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. NU1009 is supplied in the standard open execution shown in the table.
Can NU1009 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 NU1009?
Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 52.5 mm, Ew 67.5 mm. The nominal bore/OD remain 45/75 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 9,900 r/min grease / 12,000 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.