61806-2RS bearing: complete specifications & equivalents
The 61806-2RS is a ISO 15 radial bearing sized 30 x 42 x 7 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 | 30 mm |
| Outer diameter D | 42 mm |
| Width B | 7 mm |
| Material | GCr15 |
| Seal / shield | 2RS |
| Internal clearance | CN / C3 available |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 4.49 kN |
| Basic static load rating C0 | 2.9 kN |
| Fatigue load limit Pu | 0.146 kN |
| Limiting speed (mechanical) | 9500 rpm |
| Operating temperature | -30 to +110 °C |
| Mass | 25 g |
| Manufacturer designation | SKF 61806-2RS1 |
| 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 | 1.181 in |
|---|---|
| Outer diameter D | 1.654 in |
| Width B | 0.276 in |
| ISO bore code | 06 |
| Radial section height (D−d)/2 | 6 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) | 17 of 74 |
| Bore above smallest 61800-series size | 29 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 61806-2RS-FAG | FAG | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 30×42×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| 61806-FAG | FAG | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 30×42×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting. |
| 61806-ZZ-FAG | FAG | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 30×42×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting. |
| 61806-2RS-NSK | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 30×42×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| 61806-NSK | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 30×42×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting. |
| 61806-RSR-NSK | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 30×42×7 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting. |
| 61806-ZZ | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 30×42×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting. |
| 61806-2RS-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 30×42×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| 61806-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 30×42×7 mm envelope per ISO 15; seal variant (2RS vs OPEN) and load ratings differ — confirm sealing and rating before substituting. |
| 61806-RSR-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 30×42×7 mm envelope per ISO 15; seal variant (2RS vs RSR) and load ratings differ — confirm sealing and rating before substituting. |
| 61806-ZZ-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 30×42×7 mm envelope per ISO 15; seal variant (2RS vs ZZ) and load ratings differ — confirm sealing and rating before substituting. |
| W61806-2RS | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF stainless execution W 61806-2RS1 shares the 30×42×7 mm envelope but rates differently (4.49/2.9 kN vs 3.58/2.9 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 61806-2RS model number is decoded
61806-2RS is closed by two contacting elastomer lips over a lifetime grease fill; the lips add friction, so the speed ceiling sits below the open execution. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 06 by five gives the 30 mm bore; the 42 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 30 mm shaft under normal load, catalogue practice seats it on a k5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's contact-seal catalogue number is 61806-2RS1 (older text: -2RS1), mapped here from the industry-neutral -2RS spelling.
Typical equipment & failure modes
Common applications
- textile machinery
- packaging machinery
- space-constrained gearboxes
- clutch and transmission assemblies
Known failure patterns
- seal-lip hardening and loss of pre-grease in sustained high-temperature service
- grease-life expiry in the sealed-for-life cavity (no relubrication path)
- fretting corrosion on a loose shaft seat
- cage damage from operation beyond the limiting speed
Selection pitfalls — read before you substitute
- At a 30 mm bore, a shaft-seat burr or an overtight setscrew can score the thin inner ring of 61806-2RS; check shaft finish and runout (target Ra ≤ 1.6 µm) before pressing it home.
- The 618xx thin section at 30 mm bore has only a 6.0 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 6206.
- Heat is the enemy of the sealed 61806-2RS: sustained running near the lip temperature limit hardens the rubber, after which grease escapes and dirt tracks in — watch the housing temperature in hot drives.
- Never wash a sealed 61806-2RS in solvent or press it home via the outer ring; solvent destroys the grease thickener and mounting force through the seal deforms the lip.
- Do not quieten a noisy bearing by preloading it: the 61800-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.
- Deep-groove ball bearings tolerate only minutes of misalignment; if the 42 mm housing cannot be aligned, switch to a self-aligning type rather than shimming 61806-2RS.
- SKF catalogues the contact-sealed version as 61806-2RS1 (older printings may read -2RS1); it is shipped pre-greased and its 9500 r/min limiting speed is set by seal-lip drag and grease life versus the open bearing's 32000 r/min thermal reference speed.
- The 4.49/2.9 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 61806-2RS bearing?
A 61806-2RS deep-groove ball bearing has a 30 mm bore, 42 mm outer diameter and 7 mm width (1.181 × 1.654 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased.
How does the 61806 bore code work?
The last two digits of 61806 are bore code 06, giving 06 × 5 = 30 mm bore. The 42 mm outside diameter and 7 mm width follow the ISO 15 diameter series, not the bore code alone.
What does the 2RS suffix on 61806-2RS mean?
2RS means two contact elastomer seals, one each side, usually over a lifetime grease fill. Sealing against dust and moisture is better than ZZ shields, but the lip drag lowers the speed and temperature ceiling.
How does the 61800 compare with other series at the same 30 mm bore?
618 is an extra-thin section: 42×7 mm, only 6.0 mm radial section at 30 mm bore, far smaller than a 6206, for space-limited layouts at the cost of load rating and misalignment tolerance.
What is the SKF designation and catalogue data for 61806-2RS?
In the SKF Rolling Bearings catalogue this size is listed as 61806-2RS1 — two contact elastomer seals over a lifetime grease fill, 30×42×7 mm per ISO 15. Quoted values: C 4.49 kN, C0 2.9 kN, Pu 0.146 kN, limiting speed 9500 r/min, mass 25 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61806-2RS.
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.