6224-ZZ bearing: complete specifications & equivalents
The 6224-ZZ is a ISO 15 radial bearing sized 120 x 215 x 40 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 | 120 mm |
| Outer diameter D | 215 mm |
| Width B | 40 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 | 146 kN |
| Basic static load rating C0 | 118 kN |
| Fatigue load limit Pu | 3.9 kN |
| Reference speed (thermal) | 6300 rpm |
| Limiting speed (mechanical) | 3200 rpm |
| Operating temperature | -30 to +120 °C |
| Mass | 5350 g |
| Manufacturer designation | SKF 6224-2Z |
| 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 & 6200-series range
| Bore d | 4.724 in |
|---|---|
| Outer diameter D | 8.465 in |
| Width B | 1.575 in |
| ISO bore code | 24 |
| Radial section height (D−d)/2 | 47.5 mm |
| Smallest bore in 6200-series | 3 mm |
| Largest outer diameter in 6200-series | 540 mm |
| Width range across 6200-series | 2.5–85 mm |
| Bore position in 6200-series (smallest first) | 32 of 45 |
| Bore above smallest 6200-series size | 117 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 6224 | 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. |
| 6224-2RS-NSK | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 120×215×40 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting. |
| 6224-NSK | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 120×215×40 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting. |
| 6224-RSR | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 120×215×40 mm envelope per ISO 15; seal variant (ZZ vs RSR) and load ratings differ — confirm sealing and rating before substituting. |
| 6224-ZZ-NSK | NSK | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 120×215×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| 6224-2RS-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 120×215×40 mm envelope per ISO 15; seal variant (ZZ vs 2RS) and load ratings differ — confirm sealing and rating before substituting. |
| 6224-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 120×215×40 mm envelope per ISO 15; seal variant (ZZ vs OPEN) and load ratings differ — confirm sealing and rating before substituting. |
| 6224-ZZ-NTN | NTN | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 120×215×40 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting. |
| 6224-M | SKF | full Dimensions and internal design equivalent — standard interchange. | SKF 6224 M (machined brass cage, open arrangement) is the same-size execution on the 120×215×40 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 6224-ZZ model number is decoded
6224-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 light 62xx section (diameter series 2 of ISO 15), multiplying bore code 24 by five gives the 120 mm bore; the 215 mm outside diameter and 40 mm width follow the same boundary-dimension plan. For a rotating inner ring on a 120 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. SKF's own suffix is 2Z (this page's industry-neutral spelling is -ZZ); catalogue number 6224-2Z.
Typical equipment & failure modes
Common applications
- hoists and winches
- heavy conveyors
- pulp and paper machinery
- medium and heavy industrial drives
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
- raceway smearing under marginal lubrication at start-up
- edge loading from shaft deflection or housing misalignment
Selection pitfalls — read before you substitute
- Large bores like the 120 mm of 6224-ZZ demand clean, burr-free seats; one raised burr under a ring this size cocks the bearing and concentrates load at the raceway edge, cutting life drastically.
- The 62xx light series is the default general-purpose section at 120 mm bore; before upgrading to a 6324 for extra capacity, confirm the housing accepts a 215 mm OD and 40 mm width — it is not a drop-in swap.
- ZZ shields are non-contact: 6224-ZZ blocks chips and coarse dust but is not waterproof — do not install it expecting a pressure-wash seal, step up to 6224-2RS for that.
- Do not wash 6224-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 6224-ZZ units: rings, cage and balls are factory-matched and are not field-interchangeable, even between identical designations.
- Measure the shaft, do not trust the drawing: a 120 mm nominal journal worn by even 0.02 mm turns an interference seat into a creeping fit that frets the bore of 6224-ZZ.
- SKF spells the shielded version 6224-2Z (one shield: 6224-Z), not "-ZZ": the suffix language differs by brand even though the ISO envelope is identical, so quote the brand designation when ordering.
- The single-shield execution 6224-Z is a distinct order number in catalogue 17000: it suits open gears or oil-bath arrangements where the unshielded face faces the lubricant, and it is not interchangeable with the double-shield 6224-2Z for high-contamination positions.
- The 146/118 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 6224-ZZ bearing?
A 6224-ZZ deep-groove ball bearing has a 120 mm bore, 215 mm outer diameter and 40 mm width (4.724 × 8.465 × 1.575 in), per ISO 15 boundary dimensions. It is fitted with two non-contact metallic shields.
What does the ZZ suffix on 6224-ZZ mean?
ZZ means two non-contact sheet-metal shields, one each side. They retain factory grease and block coarse particles with little friction, but do not seal against liquids, fine dust or pressure washing.
How does the 6200 compare with other series at the same 120 mm bore?
The '2' is the light diameter series: 215×40 mm with a 47.5 mm radial section at 120 mm bore. A 6324 on the same bore is larger and higher-rated; a 6024 is smaller and lower-rated.
Are 6224 bearings from different brands interchangeable?
For boundary dimensions, yes: every brand's 6224 uses the same ISO 15 envelope (120×215×40 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 is the SKF designation and catalogue data for 6224-ZZ?
In the SKF Rolling Bearings catalogue this size is listed as 6224-2Z — two non-contact sheet-metal shields, 120×215×40 mm per ISO 15. Quoted values: C 146 kN, C0 118 kN, Pu 3.9 kN, limiting speed 3200 r/min, mass 5350 g. Brand suffixes (2Z, 2RSH, 2RSL) differ from the industry-neutral spelling 6224-ZZ.
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.