2309-E-2RS1KTN9 bearing: complete specifications & equivalents
The 2309-E-2RS1KTN9 is a ISO 15 radial bearing sized 45 x 100 x 36 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 | 45 mm |
| Outer diameter D | 100 mm |
| Width B | 36 mm |
| Material | GCr15 |
| Seal / shield | 2RS |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 39 kN |
| Basic static load rating C0 | 13.4 kN |
| Fatigue load limit Pu | 0.7 kN |
| Limiting speed (mechanical) | 4500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 1300 g |
| Manufacturer designation | 2309 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 | 1.772 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; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting. |
| 2309-E-2RS1TN9 | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 45×100×36 mm envelope with catalogue ratings within 10 %; 2309 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. |
| 2309-ETN9 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 45×100×36 mm envelope, but catalogue C/C0 differ between executions (39/13.4 kN vs 63.7/19.3 kN) — boundary dimensions match, not a load-rating equivalent. |
| 2309-EKTN9 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 45×100×36 mm envelope, but catalogue C/C0 differ between executions (39/13.4 kN vs 63.7/19.3 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 2309-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: 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 39 kN, C0 13.4 kN and Pu 0.7 kN. SKF spells the sealed execution 2309 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 4500 r/min, catalogue mass 1300 g.
Typical equipment & failure modes
Common applications
- conveyor drum and pulley shafts
- agricultural gearboxes
- textile machinery drives
- industrial fans and blowers
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
- 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-E-2RS1KTN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.
- The fatigue load limit is 0.7 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.
- The 2RS1 contact seals on 2309-E-2RS1KTN9 add drag and cap speed at 4500 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 2309-E-2RS1KTN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 4500 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.
- At 45 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 2309-E-2RS1KTN9?
SKF 2309 E-2RS1KTN9 measures 45 mm bore × 100 mm OD × 36 mm width (1.772 × 3.937 × 1.417 in), mass about 1300 g. It has two contact rubber seals (2RS1) and a lifetime grease fill.
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.
Can 2309-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 2309-E-2RS1KTN9?
With a rotating inner ring use roughly k5 on the shaft and H7 in the 100 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.