61817 bearing: complete specifications & equivalents
The 61817 is a ISO 15 radial bearing sized 85 x 110 x 13 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 85 mm |
| Outer diameter D | 110 mm |
| Width B | 13 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN / C3 available |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 19.5 kN |
| Basic static load rating C0 | 16.6 kN |
| Fatigue load limit Pu | 0.88 kN |
| Reference speed (thermal) | 12000 rpm |
| Limiting speed (mechanical) | 7500 rpm |
| Operating temperature | -40 to +150 °C |
| Mass | 260 g |
| Manufacturer designation | SKF 61817 |
| 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 | 3.346 in |
|---|---|
| Outer diameter D | 4.331 in |
| Width B | 0.512 in |
| ISO bore code | 17 |
| Radial section height (D−d)/2 | 12.5 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) | 28 of 74 |
| Bore above smallest 61800-series size | 84 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 61817-2RS-NSK | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 85×110×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting. |
| 61817-NSK | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 85×110×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| 61817-RSR-NSK | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 85×110×13 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting. |
| 61817-ZZ | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 85×110×13 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting. |
| 61817-2RS-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 85×110×13 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting. |
| 61817-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 85×110×13 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| 61817-RSR-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 85×110×13 mm envelope per ISO 15; seal variant (OPEN vs RSR) and load ratings differ — confirm sealing and rating before substituting. |
| 61817-ZZ-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 85×110×13 mm envelope per ISO 15; seal variant (OPEN 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 61817 model number is decoded
In the 61800-series (diameter series 8 of ISO 15) the last two digits encode the bore: 61817 carries bore code 17 = 85 mm. Outside diameter 110 mm and width 13 mm come from the ISO 15 boundary-dimensions general plan. With no seal suffix the bearing is open: no shields or seals are fitted and lubrication is supplied by the application. For normal-load mounting with a rotating inner ring on a 85 mm shaft, typical catalogue practice is a k5 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude. In the SKF catalogue this open execution carries the bare designation; protected variants are ordered separately as -2Z and -2RSH.
Typical equipment & failure modes
Common applications
- lay shafts and idler shafts
- textile machinery
- packaging machinery
- space-constrained gearboxes
Known failure patterns
- contamination wear from dust and dirt ingress through the open arrangement
- lubricant starvation when no regreasing interval is maintained
- 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
- Mount this 85 mm bore bearing by heating the inner ring (induction heater, max 120 °C) — never drive it home through the outer ring or balls, that brinells the raceways.
- Only 12.5 mm of radial section separates bore and OD on the 618xx series at 85 mm: ring flex from clamping or an oval housing bore transfers straight into raceway stress, so seat roundness matters more here than on a 6217.
- Storage matters for open bearings: 61817 leaves the factory with rust preventive only, so clean it and apply the service grease at assembly even if the rings look oily from the wrapper.
- Open bearings tolerate the highest speeds in the 61800-series but need a defined regreasing interval; run-to-failure lubrication is the dominant cause of early failure in open 61817 units.
- Never mix components between two 61817 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.
- 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.
- The open 61817 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61817-2Z (shields) and 61817-2RSH (contact seals), not suffix-free 61817.
- The 19.5/16.6 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 61817 bearing?
A 61817 deep-groove ball bearing has a 85 mm bore, 110 mm outer diameter and 13 mm width (3.346 × 4.331 × 0.512 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields.
What lubrication does 61817 need?
The open 61817 is lubricated by the application; a NLGI 2 lithium-soap grease filled to roughly 25–35% of the free volume is the common choice, with a defined relubrication interval.
How does the 61817 bore code work?
The last two digits of 61817 are bore code 17, giving 17 × 5 = 85 mm bore. The 110 mm outside diameter and 13 mm width follow the ISO 15 diameter series, not the bore code alone.
What does no suffix on 61817 mean?
A bare 61817 designation means open: no shields or seals, normal CN radial clearance and P0 normal tolerance unless further suffixes are ordered. The application must supply and retain the lubrication.
What is the SKF designation and catalogue data for 61817?
In the SKF Rolling Bearings catalogue this size is listed as 61817 — the open (unsealed) execution, 85×110×13 mm per ISO 15. Quoted values: C 19.5 kN, C0 16.6 kN, Pu 0.88 kN, limiting speed 7500 r/min, mass 260 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61817.
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.