2305-E-2RS1KTN9 bearing: complete specifications & equivalents
The 2305-E-2RS1KTN9 is a ISO 15 radial bearing sized 25 x 62 x 24 mm (bore x OD x width) with 2RS sealing. 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 | 2RS |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 19 kN |
| Basic static load rating C0 | 5.4 kN |
| Fatigue load limit Pu | 0.28 kN |
| Limiting speed (mechanical) | 7500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 340 g |
| Manufacturer designation | 2305 E-2RS1KTN9 |
| 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 | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 25×62×24 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting. |
| 2305-E-2RS1TN9 | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 25×62×24 mm envelope with catalogue ratings within 10 %; 2305 E-2RS1TN9 is the glass-fibre PA66 cage, two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs. |
| 2305-ETN9 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 25×62×24 mm envelope, but catalogue C/C0 differ between executions (19/5.4 kN vs 27/7.1 kN) — boundary dimensions match, not a load-rating equivalent. |
| 2305-EKTN9 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 25×62×24 mm envelope, but catalogue C/C0 differ between executions (19/5.4 kN vs 27/7.1 kN) — boundary dimensions match, not a load-rating equivalent. |
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-E-2RS1KTN9 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 19 kN, C0 5.4 kN and Pu 0.28 kN. SKF spells the sealed execution 2305 E-2RS1KTN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1KTN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The K suffix marks a 1:12 tapered bore for direct mounting on a tapered shaft or with an adapter sleeve. Limiting speed 7500 r/min, catalogue mass 340 g.
Typical equipment & failure modes
Common applications
- woodworking machine spindles
- light gearbox layshafts
- food-processing conveyors
- small electric motors
Known failure patterns
- fine dust or moisture passing a worn seal lip in dirty or wet duty
- grease loss when the sealed-for-life cavity is overheated with no relubrication path
- adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder
- incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance
- 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-E-2RS1KTN9 (C 19 kN, C0 5.4 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.
- Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2305-E-2RS1KTN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.
- The 2RS1 contact seals on 2305-E-2RS1KTN9 add drag and cap speed at 7500 r/min; no thermal reference speed is published because seal and grease life govern, not the bearing steel.
- Tighten the adapter sleeve to the SKF-recommended starting clearance, not to feel — an over-tightened sleeve expands the inner ring and removes all internal clearance.
- The E-2RS1KTN9 suffix on 2305-E-2RS1KTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 7500 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.
- Assign interference to the rotating ring: on a 25 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 2305-E-2RS1KTN9?
SKF 2305 E-2RS1KTN9 measures 25 mm bore × 62 mm OD × 24 mm width (0.984 × 2.441 × 0.945 in), mass about 340 g. It has two contact rubber seals (2RS1) and a lifetime grease fill.
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.
Can 2305-E-2RS1KTN9 take axial load?
A self-aligning ball bearing can carry some axial load in addition to radial load, but its axial capacity is lower than an angular-contact bearing of the same envelope. Use it where misalignment, not thrust, is the main requirement.
Which fits should I use for 2305-E-2RS1KTN9?
With a rotating inner ring use roughly k5 on the shaft and H7 in the 62 mm housing; reverse the interference if the outer ring rotates.
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.