61809-RSR bearing: complete specifications & equivalents
The 61809-RSR is a ISO 15 radial bearing sized 45 x 58 x 7 mm (bore x OD x width) with RSR sealing. Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 45 mm |
| Outer diameter D | 58 mm |
| Width B | 7 mm |
| Material | GCr15 |
| Seal / shield | RSR |
| Internal clearance | CN / C3 available |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 6.63 kN |
| Basic static load rating C0 | 6.1 kN |
| Fatigue load limit Pu | 0.26 kN |
| Reference speed (thermal) | 22000 rpm |
| Limiting speed (mechanical) | 11000 rpm |
| Operating temperature | -30 to +120 °C |
| Mass | 40 g |
| Manufacturer designation | SKF 61809-2RZ |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018) |
| Last verified | 2026-09-24 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018)) · extracted 2026-09-24
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 & 61800-series range
| Bore d | 1.772 in |
|---|---|
| Outer diameter D | 2.283 in |
| Width B | 0.276 in |
| ISO bore code | 09 |
| Radial section height (D−d)/2 | 6.5 mm |
| Smallest bore in 61800-series | 1 mm |
| Largest outer diameter in 61800-series | 1820 mm |
| Width range across 61800-series | 1–140 mm |
| Bore position in 61800-series (smallest first) | 20 of 74 |
| Bore above smallest 61800-series size | 44 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 61809-2RS-NSK | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 45×58×7 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty. |
| 61809-NSK | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 45×58×7 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty. |
| 61809-RSR-NSK | NSK | full Dimensions and internal design equivalent — standard interchange. | Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier. |
| 61809-ZZ | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 45×58×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty. |
| 61809-2RS-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 45×58×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting. |
| 61809-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 45×58×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting. |
| 61809-RSR-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 45×58×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| 61809-ZZ-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 45×58×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting. |
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 61809-RSR model number is decoded
In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61809 carries bore code 09 = 45 mm. Outside diameter 58 mm and width 7 mm come from the ISO 15 boundary-dimensions general plan. Suffix -RSR denotes two low-friction non-contact elastomer seals; they keep coarse debris out with minimal drag but are not liquid-tight. For normal-load mounting with a rotating inner ring on a 45 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. SKF's low-friction seal suffix is 2RSL/2RZ (this page's industry-neutral spelling is -RSR); catalogue number 61809-2RZ.
Typical equipment & failure modes
Common applications
- clutch and transmission assemblies
- robotics and automation joints
- lay shafts and idler shafts
- textile machinery
Known failure patterns
- ingress of fine dust or moisture past the non-contact lip in dirty or wet duty (RSR is not liquid-tight)
- lip-lubricant starvation if the bearing runs dry for extended periods
- rolling-contact fatigue spalling after the rated L10 life is exceeded
- brinelling from static overload or hammering during mounting
Selection pitfalls — read before you substitute
- At a 45 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61809-RSR; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.
- Only 6.5 mm of radial section separates bore and OD on the 618xx series at 45 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6209.
- The low-drag lip of 61809-RSR barely touches the inner ring; after long shelf storage the grease can separate, so rotate the rings by hand and confirm smooth, silent running before fitting.
- The non-contact lip of 61809-RSR does not retain a lifetime grease fill the way a contact seal does; confirm the regreasing interval for the 45 mm bore position before relying on it as sealed-for-life.
- Never mix components between two 61809-RSR units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.
- The housing bore for the 58 mm OD should be round within IT7; an oval bore pinches the outer ring of 61809-RSR and shows up later as two-point loaded raceway wear.
- SKF catalogues the low-friction seal as 61809-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 11000 r/min limiting speed, closer to the open bearing's 22000 r/min reference than the contact-seal version. It keeps coarse debris out without the drag of a contact seal, but is not liquid-tight — use 2RSH for wet or fine-dust positions.
- The 6.63/6.1 kN ratings here are SKF Explorer-class figures from catalogue PUB BU/P1 17000/1 EN (Oct 2018); SKF can revise internal geometry and ratings without changing the designation, so treat the catalogue version and date as part of the specification and re-verify for critical drives.
Frequently asked questions
What are the dimensions of a 61809-RSR bearing?
A 61809-RSR deep-groove ball bearing has a 45 mm bore, 58 mm outer diameter and 7 mm width (1.772 × 2.283 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals.
How should 61809-RSR be mounted?
Apply the mounting force to the ring being fitted: on a 45 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals.
What lubrication does 61809-RSR need?
61809-RSR is supplied pre-greased for life and is not designed to be opened for relubrication; where a relubrication path is required, specify the open 61809 with a housing grease fitting instead.
How does the 61809 bore code work?
The last two digits of 61809 are bore code 09, giving 09 × 5 = 45 mm bore. The 58 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone.
What is the SKF designation and catalogue data for 61809-RSR?
In the SKF Rolling Bearings catalogue this size is listed as 61809-2RZ — two low-friction non-contact elastomer seals, 45×58×7 mm per ISO 15. Quoted values: C 6.63 kN, C0 6.1 kN, Pu 0.26 kN, limiting speed 11000 r/min, mass 40 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61809-RSR.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018) on 2026-09-24. Read our editorial & correction policy.