2305-ETN9 bearing: complete specifications & equivalents
The 2305-ETN9 is a ISO 15 radial bearing sized 25 x 62 x 24 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 25 mm |
| Outer diameter D | 62 mm |
| Width B | 24 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 27 kN |
| Basic static load rating C0 | 7.1 kN |
| Fatigue load limit Pu | 0.37 kN |
| Reference speed (thermal) | 22000 rpm |
| Limiting speed (mechanical) | 16000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 340 g |
| Manufacturer designation | 2305 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 | 0.984 in |
|---|---|
| Outer diameter D | 2.441 in |
| Width B | 0.945 in |
| ISO bore code | 05 |
| Radial section height (D−d)/2 | 18.5 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) | 6 of 21 |
| Bore above smallest 2300-series size | 15 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 2305 | NTN | full Dimensions and internal design equivalent — standard interchange. | Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier. |
| 2305-E-2RS1TN9 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 25×62×24 mm envelope, but catalogue C/C0 differ between executions (27/7.1 kN vs 19/5.4 kN) — boundary dimensions match, not a load-rating equivalent. |
| 2305-E-2RS1KTN9 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 25×62×24 mm envelope, but catalogue C/C0 differ between executions (27/7.1 kN vs 19/5.4 kN) — boundary dimensions match, not a load-rating equivalent. |
| 2305-EKTN9 | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 25×62×24 mm envelope with catalogue ratings within 10 %; 2305 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 2305-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: 2305 carries code 05 = 25 mm (code × 5). Envelope 25×62×24 mm (0.984×2.441×0.945 in) with a 18.5 mm radial section height, C 27 kN, C0 7.1 kN and Pu 0.37 kN. The open 2305 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 25 mm shaft. Reference (thermal) speed 22000 r/min, limiting speed 16000 r/min, catalogue mass 340 g.
Typical equipment & failure modes
Common applications
- conveyor idler rollers
- agricultural machinery shafts
- textile spindles and looms
- fan and blower shafts
Known failure patterns
- contamination wear when the open arrangement is used without adequate external sealing
- lubricant starvation where no regreasing interval is maintained
- raceway smearing under marginal lubrication at start-up
- electrical pitting in VFD-driven motors without shaft grounding
Selection pitfalls — read before you substitute
- Catalogue ratings for 2305-ETN9 (C 27 kN, C0 7.1 kN) are SKF figures from PUB BU/P1 17000; geometry revisions can change ratings without changing the designation, so keep the catalogue edition with the specification.
- The fatigue load limit is 0.37 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.
- The ETN9 suffix on 2305-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 16000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.
- Mount 2305-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.
- The fatigue load limit is 0.37 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.
- At 25 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.
Frequently asked questions
What are the dimensions of 2305-ETN9?
SKF 2305 ETN9 measures 25 mm bore × 62 mm OD × 24 mm width (0.984 × 2.441 × 0.945 in), mass about 340 g. It is open, with no shields or seals.
How does the bore code in 2305 work?
The final two digits of 2305 are bore code 05, multiplied by 5 to give 25 mm.
How heavy is 2305-ETN9?
Catalogue mass is 340 g for 2305 ETN9; seal and cage executions of the same envelope differ by a few grams.
What load can 2305-ETN9 take?
Catalogue values for 2305 ETN9: dynamic C 27 kN, static C0 7.1 kN, fatigue limit Pu 0.37 kN. Use C in life calculation and C0 for static checks at 25 mm bore.
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.