2204-ETN9 bearing: complete specifications & equivalents
The 2204-ETN9 is a ISO 15 radial bearing sized 20 x 47 x 18 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 | 47 mm |
| Width B | 18 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 16.8 kN |
| Basic static load rating C0 | 4.15 kN |
| Fatigue load limit Pu | 0.22 kN |
| Reference speed (thermal) | 28000 rpm |
| Limiting speed (mechanical) | 20000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 140 g |
| Manufacturer designation | 2204 ETN9 |
| 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 & 2200-series range
| Bore d | 0.787 in |
|---|---|
| Outer diameter D | 1.85 in |
| Width B | 0.709 in |
| ISO bore code | 04 |
| Radial section height (D−d)/2 | 13.5 mm |
| Smallest bore in 2200-series | 10 mm |
| Largest outer diameter in 2200-series | 200 mm |
| Width range across 2200-series | 14–53 mm |
| Bore position in 2200-series (smallest first) | 5 of 23 |
| Bore above smallest 2200-series size | 10 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 2204 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | NTN bearing 2204S on the same 20×47×18 mm envelope, but catalogue C/C0 differ (16.8/4.15 kN vs 12.8/3.3 kN) — envelope interchange only after a load check. |
| 2204K | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | NTN bearing 2204SK on the same 20×47×18 mm envelope, but catalogue C/C0 differ (16.8/4.15 kN vs 12.8/3.3 kN) — envelope interchange only after a load check. |
| 2204-E-2RS1TN9 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 20×47×18 mm envelope, but catalogue C/C0 differ between executions (16.8/4.15 kN vs 12.7/3.4 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 2204-ETN9 model number is decoded
The 22xx series is the wide light-section self-aligning ball bearing (ISO dimension series 22). the last two digits encode the bore: 2204 carries code 04 = 20 mm (code × 5). Envelope 20×47×18 mm (0.787×1.85×0.709 in) with a 13.5 mm radial section height, C 16.8 kN, C0 4.15 kN and Pu 0.22 kN. The open 2204 ETN9 carries no shields or seals and relies on application lubrication and external sealing. The ETN9 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 28000 r/min, limiting speed 20000 r/min, catalogue mass 140 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
- 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 2204-ETN9 (C 16.8 kN, C0 4.15 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.
- The fatigue load limit is 0.22 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.
- The ETN9 suffix on 2204-ETN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 20000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.
- Mount 2204-ETN9 by heating the inner ring (max 120 °C) on a cylindrical bore — driving it home through the outer ring or balls brinells the raceways.
- The fatigue load limit is 0.22 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.
- At 20 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 2204-ETN9?
SKF 2204 ETN9 measures 20 mm bore × 47 mm OD × 18 mm width (0.787 × 1.85 × 0.709 in), mass about 140 g. It is open, with no shields or seals.
How does the bore code in 2204 work?
The final two digits of 2204 are bore code 04, multiplied by 5 to give 20 mm.
Can 2204-ETN9 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 2204-ETN9?
With a rotating inner ring use roughly k5 on the shaft and H7 in the 47 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.