61810-RSR bearing: complete specifications & equivalents
The 61810-RSR is a ISO 15 radial bearing sized 50 x 65 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 | 50 mm |
| Outer diameter D | 65 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 | 6.76 kN |
| Basic static load rating C0 | 6.8 kN |
| Fatigue load limit Pu | 0.285 kN |
| Reference speed (thermal) | 20000 rpm |
| Limiting speed (mechanical) | 10000 rpm |
| Operating temperature | -30 to +120 °C |
| Mass | 52 g |
| Manufacturer designation | SKF 61810-2RZ |
| 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 | 1.969 in |
|---|---|
| Outer diameter D | 2.559 in |
| Width B | 0.276 in |
| ISO bore code | 10 |
| Radial section height (D−d)/2 | 7.5 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) | 21 of 74 |
| Bore above smallest 61800-series size | 49 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 61810-2RS-NSK | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 50×65×7 mm envelope per ISO 15; seal variant differs (RSR vs 2RS) — confirm sealing suits the duty. |
| 61810-NSK | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 50×65×7 mm envelope per ISO 15; seal variant differs (RSR vs OPEN) — confirm sealing suits the duty. |
| 61810-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. |
| 61810-ZZ | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 50×65×7 mm envelope per ISO 15; seal variant differs (RSR vs ZZ) — confirm sealing suits the duty. |
| 61810-2RS-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 50×65×7 mm envelope per ISO 15; seal variant (RSR vs 2RS) and load ratings differ — confirm sealing and rating before substituting. |
| 61810-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 50×65×7 mm envelope per ISO 15; seal variant (RSR vs OPEN) and load ratings differ — confirm sealing and rating before substituting. |
| 61810-RSR-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 50×65×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| 61810-ZZ-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 50×65×7 mm envelope per ISO 15; seal variant (RSR vs ZZ) and load ratings differ — confirm sealing and rating before substituting. |
| W61810-2RS | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF stainless execution W 61810-2RS1 shares the 50×65×7 mm envelope but rates differently (6.76/6.8 kN vs 5.07/5.5 kN) — 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 61810-RSR model number is decoded
In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61810 carries bore code 10 = 50 mm. Outside diameter 65 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 50 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 61810-2RZ.
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
- edge loading from shaft deflection or housing misalignment
- rolling-contact fatigue spalling after the rated L10 life is exceeded
Selection pitfalls — read before you substitute
- At 50 mm bore, induction heating to roughly 80–100 °C is the clean mounting method; never exceed 120 °C, and hold 61810 against the shaft shoulder while it cools so the ring cannot creep back.
- The 618xx thin section at 50 mm bore has only a 7.5 mm radial section height: it saves space but is highly sensitive to misalignment, shaft deflection and shock loads — verify shaft stiffness before choosing it over a 6210.
- RSR low-friction seals on 61810-RSR run faster than contact-seal 61810-2RS but let fine dust and moisture past the non-contact lip; in dirty or wet duty specify 61810-2RS instead.
- The low-drag lip of 61810-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.
- Shaft and housing fillets must clear the bearing chamfer so the 7 mm-wide ring seats square; provide an undercut or withdrawal groove instead of relying on an oversized radius.
- Grease compatibility is not guaranteed between fills: mixing lithium and polyurea thickeners in a 61800-series position can soften the mixture and leak — clean out the old fill before switching grease types.
- SKF catalogues the low-friction seal as 61810-2RZ (suffix -2RSL or -2RZ): a non-contact elastomer lip that runs near the open 10000 r/min limiting speed, closer to the open bearing's 20000 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 6.76/6.8 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 61810-RSR bearing?
A 61810-RSR deep-groove ball bearing has a 50 mm bore, 65 mm outer diameter and 7 mm width (1.969 × 2.559 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two low-friction non-contact rubber seals.
What lubrication does 61810-RSR need?
61810-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 61810 with a housing grease fitting instead.
How does the 61810 bore code work?
The last two digits of 61810 are bore code 10, giving 10 × 5 = 50 mm bore. The 65 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone.
What does the RSR suffix on 61810-RSR mean?
RSR means two low-friction non-contact rubber seals. They keep coarse debris out with minimal drag (speed close to the open bearing) but are not liquid-tight; use -2RS contact seals for wet or fine-dust environments.
What is the SKF designation and catalogue data for 61810-RSR?
In the SKF Rolling Bearings catalogue this size is listed as 61810-2RZ — two low-friction non-contact elastomer seals, 50×65×7 mm per ISO 15. Quoted values: C 6.76 kN, C0 6.8 kN, Pu 0.285 kN, limiting speed 10000 r/min, mass 52 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61810-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.