11208-TN9 bearing: complete specifications & equivalents
The 11208-TN9 is a ISO 15 radial bearing sized 40 x 80 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 | 40 mm |
| Outer diameter D | 80 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 | 19 kN |
| Basic static load rating C0 | 6.55 kN |
| Fatigue load limit Pu | 0.335 kN |
| Limiting speed (mechanical) | 5000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 720 g |
| Manufacturer designation | 11208 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 & 11200-series range
| Bore d | 1.575 in |
|---|---|
| Outer diameter D | 3.15 in |
| Width B | 0.709 in |
| ISO bore code | 08 |
| Radial section height (D−d)/2 | 20 mm |
| Smallest bore in 11200-series | 20 mm |
| Largest outer diameter in 11200-series | 110 mm |
| Width range across 11200-series | 14–22 mm |
| Bore position in 11200-series (smallest first) | 5 of 8 |
| Bore above smallest 11200-series size | 20 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 1208-ETN9 | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 40×80×18 mm envelope with catalogue ratings within 10 %; 1208 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs. |
| 1208-EKTN9 | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 40×80×18 mm envelope with catalogue ratings within 10 %; 1208 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. |
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 11208-TN9 model number is decoded
The 112xx series is SKF's extended-inner-ring self-aligning ball bearing: the inner ring is wider than the outer, giving a longer shaft seat for locating-bearing duty. the last two digits encode the bore: 11208 carries code 08 = 40 mm (code × 5). Envelope 40×80×18 mm (1.575×3.15×0.709 in) with a 20.0 mm radial section height, C 19 kN, C0 6.55 kN and Pu 0.335 kN. The open 11208 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 40 mm shaft. Limiting speed 5000 r/min, catalogue mass 720 g.
Typical equipment & failure modes
Common applications
- locating-bearing positions on long shafts
- conveyor pulleys needing a wide inner-ring seat
- shafts with a single locating bearing against a shoulder
- agricultural machinery driven shafts
Known failure patterns
- lubricant starvation where no regreasing interval is maintained
- contamination wear when the open arrangement is used without adequate external sealing
- uneven loading of the two ball rows if the extended ring is not seated square on the shaft
- the extended inner ring acting as a thrust collar: never use it to carry axial load — locate with a shaft shoulder or locknut instead
- cage damage from running beyond the limiting speed
- raceway smearing under marginal lubrication at start-up
Selection pitfalls — read before you substitute
- Assign interference to the rotating ring: on a 40 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.
- At 40 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.
- Use 11208-TN9 as a locating bearing: the extended inner ring sits against a shaft shoulder, while the non-locating bearing floats to take up thermal expansion.
- The TN9 suffix on 11208-TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 5000 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.
- Assign interference to the rotating ring: on a 40 mm rotating shaft use a k5 seat with an H7 housing; reverse the logic if the outer ring rotates.
- Catalogue ratings for 11208-TN9 (C 19 kN, C0 6.55 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.
Frequently asked questions
What are the dimensions of 11208-TN9?
SKF 11208 TN9 measures 40 mm bore × 80 mm OD × 18 mm width (1.575 × 3.15 × 0.709 in), mass about 720 g. It is open, with no shields or seals.
How does the bore code in 11208 work?
The final two digits of 11208 are bore code 08, multiplied by 5 to give 40 mm.
How much misalignment can 11208-TN9 tolerate?
Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 11208-TN9 allow less (about 1°) because the seal lip binds first.
Can 11208-TN9 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.
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.