2304-TN9 bearing: complete specifications & equivalents
The 2304-TN9 is a ISO 15 radial bearing sized 20 x 52 x 21 mm (bore x OD x width). 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 | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 18.2 kN |
| Basic static load rating C0 | 4.75 kN |
| Fatigue load limit Pu | 0.24 kN |
| Reference speed (thermal) | 26000 rpm |
| Limiting speed (mechanical) | 19000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 220 g |
| Manufacturer designation | 2304 TN9 |
| 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 | full Dimensions and internal design equivalent — standard interchange. | NTN counterpart 2304S on the same 20×52×21 mm envelope with ratings within 10 % — interchange after checking seal, cage and bore details on both pages. |
| 2304K | NTN | full Dimensions and internal design equivalent — standard interchange. | NTN counterpart 2304SK on the same 20×52×21 mm envelope with ratings within 10 % — interchange after checking seal, cage and bore details on both pages. |
| 2304-E-2RS1TN9 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 20×52×21 mm envelope, but catalogue C/C0 differ between executions (18.2/4.75 kN vs 14.3/4 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-TN9 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 18.2 kN, C0 4.75 kN and Pu 0.24 kN. The open 2304 TN9 carries no shields or seals and relies on application lubrication and external sealing. The TN9 suffix identifies the glass-fibre-reinforced polyamide 66 cage execution. The bore is cylindrical (straight), for a press-fit on a 20 mm shaft. Reference (thermal) speed 26000 r/min, limiting speed 19000 r/min, catalogue mass 220 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
- excessive misalignment loading one ball row heavily and spalling it early
- rolling-contact fatigue spalling once the catalogue L10 life is exceeded
Selection pitfalls — read before you substitute
- The fatigue load limit is 0.24 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.
- The fatigue load limit is 0.24 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.
- The TN9 suffix on 2304-TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 19000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.
- Fillet radii must clear the 2304-TN9 chamfer so the 21 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
- Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 2304-TN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.
- Assign interference to the rotating ring: on a 20 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 2304-TN9?
SKF 2304 TN9 measures 20 mm bore × 52 mm OD × 21 mm width (0.787 × 2.047 × 0.827 in), mass about 220 g. It is open, with no shields or seals.
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.
How heavy is 2304-TN9?
Catalogue mass is 220 g for 2304 TN9; seal and cage executions of the same envelope differ by a few grams.
What load can 2304-TN9 take?
Catalogue values for 2304 TN9: dynamic C 18.2 kN, static C0 4.75 kN, fatigue limit Pu 0.24 kN. Use C in life calculation and C0 for static checks at 20 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.