61924-2RS bearing: complete specifications & equivalents
The 61924-2RS is a ISO 15 radial bearing sized 120 x 165 x 22 mm (bore x OD x width) with 2RS sealing. Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Bore diameter d | 120 mm |
| Outer diameter D | 165 mm |
| Width B | 22 mm |
| Seal / shield | 2RS |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel |
| Mass (geometry estimate) | 1131 g |
| Standard | ISO 15 |
| Catalog version | iso15-ed4-geometry |
| Last verified | 2026-09-24 |
Source: ISO 15 boundary-dimensions standard · extracted 2026-09-24
Standard-interchange bearing: dimensions per ISO 15; CN clearance, P0 tolerance and a stamped-steel cage are catalogue defaults unless the supplier states otherwise, and mass is a geometry-derived estimate. Brand catalogue load ratings and limiting speeds for 61924 are being backfilled — use the inquiry form for certified values.
Dimensions in inches & 61900-series range
| Bore d | 4.724 in |
|---|---|
| Outer diameter D | 6.496 in |
| Width B | 0.866 in |
| ISO bore code | 24 |
| Radial section height (D−d)/2 | 22.5 mm |
| Smallest bore in 61900-series | 10 mm |
| Largest outer diameter in 61900-series | 420 mm |
| Width range across 61900-series | 6–56 mm |
| Bore position in 61900-series (smallest first) | 24 of 35 |
| Bore above smallest 61900-series size | 110 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 61924 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 120×165×22 mm envelope per ISO 15; seal variant differs (2RS vs OPEN) — confirm sealing suits the duty. |
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 61924-2RS model number is decoded
In the 61900-series (ISO 15 diameter series 9) the last two digits encode the bore: 61924 carries bore code 24 = 120 mm. Outside diameter 165 mm and width 22 mm come from the ISO 15 boundary-dimensions general plan. Suffix -2RS denotes two contact-type elastomer seals over a lifetime grease fill; the sealing lips add drag compared with open or shielded versions. For normal-load mounting with a rotating inner ring on a 120 mm shaft, typical catalogue practice is a m6 shaft seat with an H7 housing bore — verify against the actual load direction and magnitude.
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
- Mount this 120 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 619xx thin section (22.5 mm section height at 120 mm bore) trades load capacity for compactness; stiff, accurately aligned seats are essential or edge loading will spall the raceway early.
- Contact seals add drag and heat: 61924-2RS runs slower and cooler-limited than the open 61924; rubber lips are generally limited to roughly 80–110 °C continuous depending on grease, and C3 clearance is the common hot-duty choice.
- Never wash a sealed 61924-2RS 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 61900-series is a deep-groove design, not angular-contact; axial preload raises temperature and shortens grease life.
Frequently asked questions
What are the dimensions of a 61924-2RS bearing?
A 61924-2RS deep-groove ball bearing has a 120 mm bore, 165 mm outer diameter and 22 mm width (4.724 × 6.496 × 0.866 in), per ISO 15 boundary dimensions. It is fitted with two contact rubber seals and is normally pre-greased. Geometry-based estimated mass is about 1131 g for a steel-cage unit; catalogue masses vary slightly with seal and cage design.
How does the 61924 bore code work?
The last two digits of 61924 are bore code 24, giving 24 × 5 = 120 mm bore. The 165 mm outside diameter and 22 mm width follow the ISO 15 diameter series, not the bore code alone.
What does the 2RS suffix on 61924-2RS 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 61900 compare with other series at the same 120 mm bore?
619 is a thin section one step above 618: 165×22 mm with a 22.5 mm radial section at 120 mm bore; a 6224 on the same bore is substantially larger and more heavily rated.
Are 61924 bearings from different brands interchangeable?
For boundary dimensions, yes: every brand's 61924 uses the same ISO 15 envelope (120×165×22 mm). Load ratings, limiting speeds, clearance, precision class and sealing design can differ, so verify those in the supplier catalogue when substituting. Seal suffixes also differ by brand (2RS, DDU, LLU and similar).
Reviewed & verified by the MPN Base engineering desk against source catalog iso15-ed4-geometry on 2026-09-24. Read our editorial & correction policy.