1204-ETN9 bearing: complete specifications & equivalents
The 1204-ETN9 is a ISO 15 radial bearing sized 20 x 47 x 14 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 | 14 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 12.7 kN |
| Basic static load rating C0 | 3.4 kN |
| Fatigue load limit Pu | 0.18 kN |
| Reference speed (thermal) | 32000 rpm |
| Limiting speed (mechanical) | 20000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 120 g |
| Manufacturer designation | 1204 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 & 1200-series range
| Bore d | 0.787 in |
|---|---|
| Outer diameter D | 1.85 in |
| Width B | 0.551 in |
| ISO bore code | 04 |
| Radial section height (D−d)/2 | 13.5 mm |
| Smallest bore in 1200-series | 6 mm |
| Largest outer diameter in 1200-series | 230 mm |
| Width range across 1200-series | 6–154 mm |
| Bore position in 1200-series (smallest first) | 9 of 32 |
| Bore above smallest 1200-series size | 14 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 1204 | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 20×47×14 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| 1204-EKTN9 | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 20×47×14 mm envelope with catalogue ratings within 10 %; 1204 EKTN9 is the glass-fibre PA66 cage, open arrangement, tapered bore execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs. |
| 11204-ETN9 | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 20×47×14 mm envelope with catalogue ratings within 10 %; 11204 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs. |
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 1204-ETN9 model number is decoded
The 12xx series is the light/normal-section self-aligning ball bearing (ISO dimension series 02). the last two digits encode the bore: 1204 carries code 04 = 20 mm (code × 5). Envelope 20×47×14 mm (0.787×1.85×0.551 in) with a 13.5 mm radial section height, C 12.7 kN, C0 3.4 kN and Pu 0.18 kN. The open 1204 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 32000 r/min, limiting speed 20000 r/min, catalogue mass 120 g.
Typical equipment & failure modes
Common applications
- small electric motors
- conveyor idler rollers
- agricultural machinery shafts
- textile spindles and looms
Known failure patterns
- lubricant starvation where no regreasing interval is maintained
- contamination wear when the open arrangement is used without adequate external sealing
- false brinelling from vibration while the shaft stands idle
- fretting corrosion on a creeping shaft or housing seat
Selection pitfalls — read before you substitute
- Fillet radii must clear the 1204-ETN9 chamfer so the 14 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
- Mount 1204-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 ETN9 suffix on 1204-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.
- The spherical outer raceway lets 1204-ETN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.
- Fillet radii must clear the 1204-ETN9 chamfer so the 14 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 1204-ETN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.
Frequently asked questions
What are the dimensions of 1204-ETN9?
SKF 1204 ETN9 measures 20 mm bore × 47 mm OD × 14 mm width (0.787 × 1.85 × 0.551 in), mass about 120 g. It is open, with no shields or seals.
How does the bore code in 1204 work?
The final two digits of 1204 are bore code 04, multiplied by 5 to give 20 mm.
What load can 1204-ETN9 take?
Catalogue values for 1204 ETN9: dynamic C 12.7 kN, static C0 3.4 kN, fatigue limit Pu 0.18 kN. Use C in life calculation and C0 for static checks at 20 mm bore.
What is the speed rating of 1204-ETN9?
SKF lists a 32000 r/min thermal reference speed and a 20000 r/min mechanical limiting speed for 1204 ETN9; real limits also depend on lubrication and fits.
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.