61902-ZZ bearing: complete specifications & equivalents
The 61902-ZZ is a ISO 15 radial bearing sized 15 x 28 x 7 mm (bore x OD x width) with ZZ sealing. Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 15 mm |
| Outer diameter D | 28 mm |
| Width B | 7 mm |
| Material | GCr15 |
| Seal / shield | ZZ |
| Internal clearance | CN / C3 available |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 4.36 kN |
| Basic static load rating C0 | 2.24 kN |
| Fatigue load limit Pu | 0.095 kN |
| Reference speed (thermal) | 56000 rpm |
| Limiting speed (mechanical) | 28000 rpm |
| Operating temperature | -30 to +120 °C |
| Mass | 16 g |
| Manufacturer designation | SKF 61902-2Z |
| 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 & 61900-series range
| Bore d | 0.591 in |
|---|---|
| Outer diameter D | 1.102 in |
| Width B | 0.276 in |
| ISO bore code | 02 |
| Radial section height (D−d)/2 | 6.5 mm |
| Smallest bore in 61900-series | 3 mm |
| Largest outer diameter in 61900-series | 1120 mm |
| Width range across 61900-series | 3–118 mm |
| Bore position in 61900-series (smallest first) | 10 of 63 |
| Bore above smallest 61900-series size | 12 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 61902-2RS-FAG | FAG | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 15×28×7 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty. |
| 61902-FAG | FAG | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 15×28×7 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty. |
| 61902-ZZ-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. |
| 61902 | ISO 15 | verify Commonly quoted cross reference; confirm against the target catalog before ordering. | ISO 15 boundary-dimension envelope; seal suffix convention varies by brand (2RS / DDU / LLU / 2RSR) — verify seal design and temperature range before substituting. |
| 61902-2RS-NSK | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 15×28×7 mm envelope per ISO 15; seal variant differs (ZZ vs 2RS) — confirm sealing suits the duty. |
| 61902-NSK | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 15×28×7 mm envelope per ISO 15; seal variant differs (ZZ vs OPEN) — confirm sealing suits the duty. |
| 61902-RSR-NSK | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 15×28×7 mm envelope per ISO 15; seal variant differs (ZZ vs RSR) — confirm sealing suits the duty. |
| 61902-ZZ-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. |
| 61902-2RS-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 15×28×7 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting. |
| 61902-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 15×28×7 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting. |
| 61902-RSR-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 15×28×7 mm envelope per ISO 15; seal variant (ZZ vs RSR) and load ratings differ — confirm sealing and rating before substituting. |
| 61902-ZZ-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 15×28×7 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| W61902-2RS | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF stainless execution W 61902-2RS1 shares the 15×28×7 mm envelope but rates differently (4.36/2.24 kN vs 3.71/2.24 kN) — not a load-rating equivalent. |
| W61902-ZZ | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF stainless execution W 61902-2Z shares the 15×28×7 mm envelope but rates differently (4.36/2.24 kN vs 3.71/2.24 kN) — not a load-rating equivalent. |
| W61902 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF stainless execution W 61902 shares the 15×28×7 mm envelope but rates differently (4.36/2.24 kN vs 3.71/2.24 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 61902-ZZ model number is decoded
61902-ZZ carries two non-contact sheet-steel shields that hold the factory grease in and keep coarse debris out; they do not seal against liquids. Within the thin 619xx section (diameter series 9 of ISO 15), its bore code 02 comes from the 10/12/15/17 mm exception table, giving a 15 mm bore; the 28 mm outside diameter and 7 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 15 mm shaft under normal load, catalogue practice seats it on a j5 shaft fit with an H7 housing bore — confirm against the actual load direction and magnitude before committing. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 61902-2Z.
Typical equipment & failure modes
Common applications
- clutch and transmission assemblies
- robotics and automation joints
- lay shafts and idler shafts
- textile machinery
Known failure patterns
- fine-particle abrasion when non-contact shields let dust past in dirty duty
- grease aging in the shield-for-life cavity with no relubrication path
- cage damage from operation beyond the limiting speed
- electrical pitting in VFD-driven motors without grounding protection
Selection pitfalls — read before you substitute
- Bore codes 00–03 use the exception table: 61902 fits a 15 mm shaft — the code × 5 mnemonic does not apply below code 04 (it would imply 0 mm for code 00).
- The 619xx thin section at 15 mm bore (6.5 mm section height) cannot shrug off the misalignment a standard section tolerates; keep the housing bores round and aligned, or edge contact will spall the raceways early.
- ZZ shields are non-contact: 61902-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 61902-2RS for that.
- Do not wash 61902-ZZ in solvent before mounting: the grease inside the shielded cavity is the service fill, and solvent creeping past the shield gap strips it out.
- Never mix components between two 61902-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.
- Suffixes stack in a defined order — clearance follows the seal code, e.g. 61902-C3. No clearance suffix means normal CN clearance.
- SKF spells the shielded version 61902-2Z (one shield: 61902-Z), not "-ZZ": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.
- The 4.36/2.24 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 61902-ZZ bearing?
A 61902-ZZ deep-groove ball bearing has a 15 mm bore, 28 mm outer diameter and 7 mm width (0.591 × 1.102 × 0.276 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields.
Are 61902 bearings from different brands interchangeable?
For boundary dimensions, yes: every brand's 61902 uses the same ISO 15 envelope (15×28×7 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, 2RSL and similar).
What internal clearance does 61902-ZZ have?
Unless a clearance suffix says otherwise, 61902-ZZ is manufactured to normal (CN) radial internal clearance. Tight fits and hot shafts consume clearance in service — for those conditions order the C3 execution of 61902 and verify the residual clearance after mounting.
How should 61902-ZZ be mounted?
Apply the mounting force to the ring being fitted: on a 15 mm shaft seat the press load must pass through the inner-ring face only. A fitting sleeve and an arbor press are normally sufficient at this size. Never strike the outer ring, the cage or the seals.
What is the SKF designation and catalogue data for 61902-ZZ?
In the SKF Rolling Bearings catalogue this size is listed as 61902-2Z — two non-contact sheet-metal shields, 15×28×7 mm per ISO 15. Quoted values: C 4.36 kN, C0 2.24 kN, Pu 0.095 kN, limiting speed 28000 r/min, mass 16 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 61902-ZZ.
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.