2309-ETN9 bearing: complete specifications & equivalents
The 2309-ETN9 is a ISO 15 radial bearing sized 45 x 100 x 36 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 45 mm |
| Outer diameter D | 100 mm |
| Width B | 36 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 63.7 kN |
| Basic static load rating C0 | 19.3 kN |
| Fatigue load limit Pu | 1 kN |
| Reference speed (thermal) | 13000 rpm |
| Limiting speed (mechanical) | 9000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1250 g |
| Manufacturer designation | 2309 ETN9 |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018) |
| Last verified | 2026-09-27 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018)) · extracted 2026-09-27
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018)); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.
Dimensions in inches & 2300-series range
| Bore d | 1.772 in |
|---|---|
| Outer diameter D | 3.937 in |
| Width B | 1.417 in |
| ISO bore code | 09 |
| Radial section height (D−d)/2 | 27.5 mm |
| Smallest bore in 2300-series | 10 mm |
| Largest outer diameter in 2300-series | 215 mm |
| Width range across 2300-series | 17–73 mm |
| Bore position in 2300-series (smallest first) | 10 of 21 |
| Bore above smallest 2300-series size | 35 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 2309 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 45×100×36 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| 2309-E-2RS1TN9 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 45×100×36 mm envelope, but catalogue C/C0 differ between executions (63.7/19.3 kN vs 39/13.4 kN) — boundary dimensions match, not a load-rating equivalent. |
| 2309-E-2RS1KTN9 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 45×100×36 mm envelope, but catalogue C/C0 differ between executions (63.7/19.3 kN vs 39/13.4 kN) — boundary dimensions match, not a load-rating equivalent. |
| 2309-EKTN9 | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 45×100×36 mm envelope with catalogue ratings within 10 %; 2309 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs. |
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 2309-ETN9 model number is decoded
The 23xx series is the wide medium-section self-aligning ball bearing (ISO dimension series 23). the last two digits encode the bore: 2309 carries code 09 = 45 mm (code × 5). Envelope 45×100×36 mm (1.772×3.937×1.417 in) with a 27.5 mm radial section height, C 63.7 kN, C0 19.3 kN and Pu 1 kN. The open 2309 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 45 mm shaft. Reference (thermal) speed 13000 r/min, limiting speed 9000 r/min, catalogue mass 1250 g.
Typical equipment & failure modes
Common applications
- woodworking machinery
- pump shafts with mild misalignment
- material-handling equipment
- industrial electric motors
Known failure patterns
- contamination wear when the open arrangement is used without adequate external sealing
- lubricant starvation where no regreasing interval is maintained
- brinelling from static overload or hammer blows during mounting
- false brinelling from vibration while the shaft stands idle
Selection pitfalls — read before you substitute
- The spherical outer raceway lets 2309-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.
- Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2309-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.
- The ETN9 suffix on 2309-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 9000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.
- Fillet radii must clear the 2309-ETN9 chamfer so the 36 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
- Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2309-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.
- Assign interference to the rotating ring: on a 45 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.
Frequently asked questions
What are the dimensions of 2309-ETN9?
SKF 2309 ETN9 measures 45 mm bore × 100 mm OD × 36 mm width (1.772 × 3.937 × 1.417 in), mass about 1250 g. It is open, with no shields or seals.
How does the bore code in 2309 work?
The final two digits of 2309 are bore code 09, multiplied by 5 to give 45 mm.
What is the speed rating of 2309-ETN9?
SKF lists a 13000 r/min thermal reference speed and a 9000 r/min mechanical limiting speed for 2309 ETN9; real limits also depend on lubrication and fits.
How much misalignment can 2309-ETN9 tolerate?
Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2309-ETN9 allow less (about 1°) because the seal lip binds first.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018) on 2026-09-27. Read our editorial & correction policy.