61830 bearing: complete specifications & equivalents
The 61830 is a ISO 15 radial bearing sized 150 x 190 x 20 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 150 mm |
| Outer diameter D | 190 mm |
| Width B | 20 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 | 48.8 kN |
| Basic static load rating C0 | 61 kN |
| Fatigue load limit Pu | 1.96 kN |
| Reference speed (thermal) | 6700 rpm |
| Limiting speed (mechanical) | 4300 rpm |
| Operating temperature | -40 to +150 °C |
| Mass | 1200 g |
| Manufacturer designation | SKF 61830 |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018) |
| Last verified | 2026-09-25 |
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 | 5.906 in |
|---|---|
| Outer diameter D | 7.48 in |
| Width B | 0.787 in |
| ISO bore code | 30 |
| Radial section height (D−d)/2 | 20 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) | 37 of 74 |
| Bore above smallest 61800-series size | 149 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 61830-FAG | FAG | 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. |
| 61830 | ISO 15 | full Dimensions and internal design equivalent — standard interchange. | ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier. |
| 61830-2RS | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 150×190×20 mm envelope per ISO 15; seal variant differs (OPEN vs 2RS) — confirm sealing suits the duty. |
| 61830-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. |
| 61830-RSR | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 150×190×20 mm envelope per ISO 15; seal variant differs (OPEN vs RSR) — confirm sealing suits the duty. |
| 61830-ZZ | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 150×190×20 mm envelope per ISO 15; seal variant differs (OPEN vs ZZ) — confirm sealing suits the duty. |
| 61830-2RS-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 150×190×20 mm envelope per ISO 15; seal variant (OPEN vs 2RS) and load ratings differ — confirm sealing and rating before substituting. |
| 61830-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 150×190×20 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| 61830-ZZ-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 150×190×20 mm envelope per ISO 15; seal variant (OPEN vs ZZ) and load ratings differ — confirm sealing and rating before substituting. |
| 61830-MA | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF 61830 MA (machined brass cage, open arrangement) is the same-size execution on the 150×190×20 mm envelope with ratings within 10 % — boundary dimensions interchangeable. |
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 61830 model number is decoded
61830 is supplied open, without shields or seals, so the arrangement around it must supply and retain the lubricant. Within the extra-thin 618xx section (diameter series 8 of ISO 15), multiplying bore code 30 by five gives the 150 mm bore; the 190 mm outside diameter and 20 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 150 mm shaft under normal load, catalogue practice seats it on a m6 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. 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
- robotics and automation joints
- lay shafts and idler shafts
- textile machinery
- packaging machinery
Known failure patterns
- contamination wear from dust and dirt ingress through the open arrangement
- lubricant starvation when no regreasing interval is maintained
- cage damage from operation beyond the limiting speed
- electrical pitting in VFD-driven motors without grounding protection
Selection pitfalls — read before you substitute
- Mount this 150 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.
- The 618xx thin section at 150 mm bore has only a 20.0 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 6230.
- The open 61830 has no lubricant retention: grease escapes and contaminants migrate straight into the 150×190×20 mm raceway, so specify a sealed arrangement for dusty or washdown duty.
- 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 61830 units.
- 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.
- Never mix components between two 61830 units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.
- The open 61830 needs external sealing and application-supplied lubrication; in the SKF catalogue the protected variants are separate order numbers 61830-2Z (shields) and 61830-2RSH (contact seals), not suffix-free 61830.
- The 48.8/61 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 61830 bearing?
A 61830 deep-groove ball bearing has a 150 mm bore, 190 mm outer diameter and 20 mm width (5.906 × 7.48 × 0.787 in), per ISO 15 boundary dimensions. It is an open bearing with no seals or shields.
What lubrication does 61830 need?
The open 61830 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 61830 bore code work?
The last two digits of 61830 are bore code 30, giving 30 × 5 = 150 mm bore. The 190 mm outside diameter and 20 mm width follow the ISO 15 diameter series, not the bore code alone.
What does no suffix on 61830 mean?
A bare 61830 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 61830?
In the SKF Rolling Bearings catalogue this size is listed as 61830 — the open (unsealed) execution, 150×190×20 mm per ISO 15. Quoted values: C 48.8 kN, C0 61 kN, Pu 1.96 kN, limiting speed 4300 r/min, mass 1200 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61830.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018) on 2026-09-25. Read our editorial & correction policy.