2306-E-2RS1KTN9 bearing: complete specifications & equivalents
The 2306-E-2RS1KTN9 is a ISO 15 radial bearing sized 30 x 72 x 27 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 | 30 mm |
| Outer diameter D | 72 mm |
| Width B | 27 mm |
| Material | GCr15 |
| Seal / shield | 2RS |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 22.5 kN |
| Basic static load rating C0 | 6.8 kN |
| Fatigue load limit Pu | 0.36 kN |
| Limiting speed (mechanical) | 6700 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 510 g |
| Manufacturer designation | 2306 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 | 1.181 in |
|---|---|
| Outer diameter D | 2.835 in |
| Width B | 1.063 in |
| ISO bore code | 06 |
| Radial section height (D−d)/2 | 21 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) | 7 of 21 |
| Bore above smallest 2300-series size | 20 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 2306 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 30×72×27 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting. |
| 2306-E-2RS1TN9 | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 30×72×27 mm envelope with catalogue ratings within 10 %; 2306 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. |
| 2306-K | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 30×72×27 mm envelope, but catalogue C/C0 differ between executions (22.5/6.8 kN vs 31.2/8.8 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 2306-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: 2306 carries code 06 = 30 mm (code × 5). Envelope 30×72×27 mm (1.181×2.835×1.063 in) with a 21.0 mm radial section height, C 22.5 kN, C0 6.8 kN and Pu 0.36 kN. SKF spells the sealed execution 2306 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 6700 r/min, catalogue mass 510 g.
Typical equipment & failure modes
Common applications
- agricultural machinery shafts
- textile spindles and looms
- fan and blower shafts
- woodworking machine spindles
Known failure patterns
- grease loss when the sealed-for-life cavity is overheated with no relubrication path
- contact-seal lip hardening and grease-life expiry after long high-temperature service
- incorrect sleeve tightening that leaves the tapered bore loose or over-expanded, changing internal clearance
- adapter-sleeve fretting when the sleeve is not locked against the shaft shoulder
- rolling-contact fatigue spalling once the catalogue L10 life is exceeded
- brinelling from static overload or hammer blows during mounting
Selection pitfalls — read before you substitute
- At 30 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.
- At 30 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.
- The 2RS1 contact seals on 2306-E-2RS1KTN9 add drag and cap speed at 6700 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 2306-E-2RS1KTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 6700 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.
- Catalogue ratings for 2306-E-2RS1KTN9 (C 22.5 kN, C0 6.8 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.
Frequently asked questions
What are the dimensions of 2306-E-2RS1KTN9?
SKF 2306 E-2RS1KTN9 measures 30 mm bore × 72 mm OD × 27 mm width (1.181 × 2.835 × 1.063 in), mass about 510 g. It has two contact rubber seals (2RS1) and a lifetime grease fill.
How does the bore code in 2306 work?
The final two digits of 2306 are bore code 06, multiplied by 5 to give 30 mm.
What load can 2306-E-2RS1KTN9 take?
Catalogue values for 2306 E-2RS1KTN9: dynamic C 22.5 kN, static C0 6.8 kN, fatigue limit Pu 0.36 kN. Use C in life calculation and C0 for static checks at 30 mm bore.
What is the speed rating of 2306-E-2RS1KTN9?
SKF publishes only the 6700 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern.
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.