2304-E-2RS1TN9 bearing: complete specifications & equivalents
The 2304-E-2RS1TN9 is a ISO 15 radial bearing sized 20 x 52 x 21 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 | 20 mm |
| Outer diameter D | 52 mm |
| Width B | 21 mm |
| Material | GCr15 |
| Seal / shield | 2RS |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 14.3 kN |
| Basic static load rating C0 | 4 kN |
| Fatigue load limit Pu | 0.21 kN |
| Limiting speed (mechanical) | 9000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 210 g |
| Manufacturer designation | 2304 E-2RS1TN9 |
| 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 | 0.787 in |
|---|---|
| Outer diameter D | 2.047 in |
| Width B | 0.827 in |
| ISO bore code | 04 |
| Radial section height (D−d)/2 | 16 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) | 5 of 21 |
| Bore above smallest 2300-series size | 10 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 2304 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | NTN bearing 2304S on the same 20×52×21 mm envelope, but catalogue C/C0 differ (14.3/4 kN vs 18.5/4.7 kN) — envelope interchange only after a load check. |
| 2304K | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | NTN bearing 2304SK on the same 20×52×21 mm envelope, but catalogue C/C0 differ (14.3/4 kN vs 18.5/4.7 kN) — envelope interchange only after a load check. |
| 2304-TN9 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 20×52×21 mm envelope, but catalogue C/C0 differ between executions (14.3/4 kN vs 18.2/4.75 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 2304-E-2RS1TN9 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: 2304 carries code 04 = 20 mm (code × 5). Envelope 20×52×21 mm (0.787×2.047×0.827 in) with a 16.0 mm radial section height, C 14.3 kN, C0 4 kN and Pu 0.21 kN. SKF spells the sealed execution 2304 E-2RS1TN9 (suffix 2RS1): two contact elastomer lips over a lifetime grease fill; the lips add drag, and no thermal reference speed is published. The E-2RS1TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 20 mm shaft. Limiting speed 9000 r/min, catalogue mass 210 g.
Typical equipment & failure modes
Common applications
- food-processing conveyors
- small electric motors
- conveyor idler rollers
- agricultural machinery shafts
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
- 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 2304-E-2RS1TN9 (C 14.3 kN, C0 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.
- Catalogue ratings for 2304-E-2RS1TN9 (C 14.3 kN, C0 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.
- Do not wash 2304-E-2RS1TN9 with solvent — the lifetime grease fill is sealed in, and solvent destroys the grease without a way to repack it.
- The E-2RS1TN9 suffix on 2304-E-2RS1TN9 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.
- Catalogue ratings for 2304-E-2RS1TN9 (C 14.3 kN, C0 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.
- Mount 2304-E-2RS1TN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.
Frequently asked questions
What are the dimensions of 2304-E-2RS1TN9?
SKF 2304 E-2RS1TN9 measures 20 mm bore × 52 mm OD × 21 mm width (0.787 × 2.047 × 0.827 in), mass about 210 g. It has two contact rubber seals (2RS1) and a lifetime grease fill.
How does the bore code in 2304 work?
The final two digits of 2304 are bore code 04, multiplied by 5 to give 20 mm.
What is the speed rating of 2304-E-2RS1TN9?
SKF publishes only the 9000 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern.
How much misalignment can 2304-E-2RS1TN9 tolerate?
Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 2304-E-2RS1TN9 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.