11209-TN9 bearing: complete specifications & equivalents
The 11209-TN9 is a ISO 15 radial bearing sized 45 x 85 x 19 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 45 mm |
| Outer diameter D | 85 mm |
| Width B | 19 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | polymer (PA66 glass-fibre reinforced) |
| Basic dynamic load rating C | 22.9 kN |
| Basic static load rating C0 | 7.8 kN |
| Fatigue load limit Pu | 0.4 kN |
| Limiting speed (mechanical) | 4500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 770 g |
| Manufacturer designation | 11209 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 | 1.772 in |
|---|---|
| Outer diameter D | 3.346 in |
| Width B | 0.748 in |
| ISO bore code | 09 |
| 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) | 6 of 8 |
| Bore above smallest 11200-series size | 25 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 1209-ETN9 | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 45×85×19 mm envelope with catalogue ratings within 10 %; 1209 ETN9 is the glass-fibre PA66 cage, open arrangement execution of this size — boundary dimensions interchangeable, only the seal/cage/bore execution differs. |
| 1209-EKTN9 | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 45×85×19 mm envelope with catalogue ratings within 10 %; 1209 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 11209-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: 11209 carries code 09 = 45 mm (code × 5). Envelope 45×85×19 mm (1.772×3.346×0.748 in) with a 20.0 mm radial section height, C 22.9 kN, C0 7.8 kN and Pu 0.4 kN. The open 11209 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 45 mm shaft. Limiting speed 4500 r/min, catalogue mass 770 g.
Typical equipment & failure modes
Common applications
- agricultural machinery driven shafts
- fan shafts with thermal expansion take-up
- woodworking machine cutter shafts
- locating-bearing positions on long shafts
Known failure patterns
- contamination wear when the open arrangement is used without adequate external sealing
- lubricant starvation where no regreasing interval is maintained
- the extended inner ring acting as a thrust collar: never use it to carry axial load — locate with a shaft shoulder or locknut instead
- uneven loading of the two ball rows if the extended ring is not seated square on the shaft
- brinelling from static overload or hammer blows during mounting
- false brinelling from vibration while the shaft stands idle
Selection pitfalls — read before you substitute
- The spherical outer raceway lets 11209-TN9 tolerate shaft deflection, but it does not increase thrust capacity — combined loads still need an angular-contact or deep-groove bearing.
- Self-aligning ball bearings tolerate up to roughly 2–3° of static misalignment, but the sealed 11209-TN9 (2RS1) allows less — the lip seal binds before the spherical raceway does.
- The 112xx extended inner ring of 11209-TN9 gives a wider shaft seat but the same 45×85×19 mm envelope as a 12xx of the same bore — the outer ring is interchangeable, the inner is not.
- The TN9 suffix on 11209-TN9 denotes a glass-fibre-reinforced polyamide 66 cage: quiet and light at the 4500 r/min limiting speed, but it softens above roughly 120 °C — check the oil temperature in hot drives.
- The fatigue load limit is 0.4 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.
- At 45 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 11209-TN9?
SKF 11209 TN9 measures 45 mm bore × 85 mm OD × 19 mm width (1.772 × 3.346 × 0.748 in), mass about 770 g. It is open, with no shields or seals.
How does the bore code in 11209 work?
The final two digits of 11209 are bore code 09, multiplied by 5 to give 45 mm.
What is the speed rating of 11209-TN9?
SKF publishes only the 4500 r/min limiting speed for this execution; sealed variants have no thermal reference speed because seal and grease life govern.
How much misalignment can 11209-TN9 tolerate?
Self-aligning ball bearings tolerate roughly 2–3° of static misalignment for open executions; sealed 2RS1 variants like 11209-TN9 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.