W61909-2RS bearing: complete specifications & equivalents
The W61909-2RS is a ISO 15 radial bearing sized 45 x 68 x 12 mm (bore x OD x width) with 2RS sealing. Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 45 mm |
| Outer diameter D | 68 mm |
| Width B | 12 mm |
| Material | SS440C |
| Seal / shield | 2RS |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 12.1 kN |
| Basic static load rating C0 | 10.8 kN |
| Fatigue load limit Pu | 0.465 kN |
| Limiting speed (mechanical) | 6000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 125 g |
| Manufacturer designation | W 61909-2RS1 |
| 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 & 61900-series range
| Bore d | 1.772 in |
|---|---|
| Outer diameter D | 2.677 in |
| Width B | 0.472 in |
| ISO bore code | 09 |
| Radial section height (D−d)/2 | 11.5 mm |
| Smallest bore in 61900-series | 3 mm |
| Largest outer diameter in 61900-series | 1120 mm |
| Width range across 61900-series | 3–118 mm |
| Bore position in 61900-series (smallest first) | 17 of 63 |
| Bore above smallest 61900-series size | 42 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 61909-ZZ | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | NSK NSK 6909ZZ shares the 45×68×12 mm envelope but carries different catalogue ratings (12.1/10.8 kN vs 15.5/10.9 kN) — the stainless execution is not a load-rating equivalent. |
| 61909 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF SKF 61909 shares the 45×68×12 mm envelope but carries different catalogue ratings (12.1/10.8 kN vs 14/10.8 kN) — the stainless execution is not a load-rating equivalent. |
| 61909-2RS | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF SKF 61909-2RS1 shares the 45×68×12 mm envelope but carries different catalogue ratings (12.1/10.8 kN vs 14/10.8 kN) — the stainless execution is not a load-rating equivalent. |
| 61909-RSR | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF SKF 61909-2RZ shares the 45×68×12 mm envelope but carries different catalogue ratings (12.1/10.8 kN vs 14/10.8 kN) — the stainless execution is 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 W61909-2RS model number is decoded
The W prefix denotes SKF stainless steel deep-groove bearings (X108CrMo17 / AISI 440C class rings). In the 61900-series, the last two digits encode the bore: 61909 carries code 09 = 45 mm (code × 5). Envelope 45×68×12 mm (1.772×2.677×0.472 in), C 12.1 kN, C0 10.8 kN, Pu 0.465 kN; limiting speed 6000 r/min and mass 125 g. SKF catalogues the sealed execution as W 61909-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Stainless is chosen for corrosion and washdown duty, not for extra load — the same-envelope chrome-steel bearing rates higher.
Typical equipment & failure modes
Common applications
- bicycle and outdoor equipment
- appliances exposed to moisture
- food and beverage conveyors
- pharmaceutical and packaging machines
Known failure patterns
- seal and grease failure before the rings corrode in sustained washdown service
- surface staining and pitting when even the stainless steel is left unlubricated in salty or acidic duty
- contact-seal lip hardening and pre-grease loss after long high-temperature service
- grease-life expiry inside the sealed-for-life cavity, which has no relubrication path
Selection pitfalls — read before you substitute
- The stainless steel is martensitic and MAGNETIC; do not reject W61909-2RS over magnetism — only austenitic grades are non-magnetic, and those are too soft for bearing raceways.
- Stainless bearings carry lower load ratings than chrome steel of the same envelope: W61909-2RS is quoted at C 12.1 kN versus the 12 mm-wide 52100 version — do not swap on dimensions alone.
- Food, pharmaceutical and washdown positions need food-grade grease (e.g. NSF H1 registered) inside W61909-2RS; standard fill is industrial grease unless specified otherwise.
- Corrosion resistance depends on clean, undamaged surfaces: never weld near W61909-2RS or scratch the raceways during mounting, since the damaged spot starts corrosion.
- Do not preload W61909-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.
- Deep-groove geometry tolerates only minutes of misalignment; if the 68 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming W61909-2RS.
Frequently asked questions
What are the dimensions of the stainless W61909-2RS?
SKF W 61909-2RS1 measures 45×68×12 mm (1.772×2.677×0.472 in), about 125 g, C 12.1 kN.
What does the W in W 61909-2RS1 mean?
W is the SKF prefix for stainless steel deep-groove bearings (rings in X108CrMo17 / AISI 440C class); the rest of the designation follows the normal series and bore rules.
Can I replace a chrome-steel bearing with stainless W61909-2RS?
The envelope matches, but stainless rates lower (C 12.1 kN for W 61909-2RS1); for corrosive environments that trade-off is intended, for high loads it shortens life.
Is the stainless bearing magnetic?
Yes. Bearing stainless steels are martensitic (hardened) and magnetic; non-magnetic austenitic grades cannot be hardened enough for raceways and balls.
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.