608-ZZ bearing: complete specifications & equivalents
The 608-ZZ is a ISO 15 radial bearing sized 8 x 22 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 | 8 mm |
| Outer diameter D | 22 mm |
| Width B | 7 mm |
| Material | GCr15 |
| Seal / shield | ZZ |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 3.45 kN |
| Basic static load rating C0 | 1.37 kN |
| Fatigue load limit Pu | 0.057 kN |
| Reference speed (thermal) | 75000 rpm |
| Limiting speed (mechanical) | 38000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 13 g |
| Manufacturer designation | 608-2Z |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018) |
| Last verified | 2026-09-27 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018)) · extracted 2026-09-27
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 & 6000-series range
| Bore d | 0.315 in |
|---|---|
| Outer diameter D | 0.866 in |
| Width B | 0.276 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 7 mm |
| Smallest bore in 6000-series | 4 mm |
| Largest outer diameter in 6000-series | 1150 mm |
| Width range across 6000-series | 4–155 mm |
| Bore position in 6000-series (smallest first) | 5 of 61 |
| Bore above smallest 6000-series size | 4 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 608 | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 8×22×7 mm envelope and equivalent catalogue ratings; 608 is the open arrangement execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs. |
| 608-2RS | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 8×22×7 mm envelope and equivalent catalogue ratings; 608-2RSH is the two contact elastomer seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs. |
| 608-RSR | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 8×22×7 mm envelope and equivalent catalogue ratings; 608-2RSL is the low-friction non-contact seals execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs. |
| W608-2RS | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 8×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.45/1.37 kN vs 1.99/0.78 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty. |
| W608-ZZ | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 8×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.45/1.37 kN vs 1.99/0.78 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty. |
| W608 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 8×22×7 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (3.45/1.37 kN vs 1.99/0.78 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load 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 608-ZZ model number is decoded
In the 6000-series, the final digit is the bore in millimetres: 608 fits a 8 mm shaft (direct-number miniature spelling). The envelope is 8×22×7 mm (0.315×0.866×0.276 in) with a 7.0 mm radial section height, C 3.45 kN, C0 1.37 kN and Pu 0.057 kN. SKF spells the double shield 608-2Z (suffix 2Z); the shields are non-contact, retain grease and block coarse debris but are not liquid-tight. Limiting speed 38000 r/min, catalogue mass 13 g.
Typical equipment & failure modes
Common applications
- office equipment
- fractional-horsepower motors
- small fans and blowers
- hand-held power tools
Known failure patterns
- fine-particle abrasion when non-contact shields let dust through in a dirty environment
- grease aging inside the shielded cavity with no relubrication path
- brinelling from static overload or hammer blows during mounting
- false brinelling from vibration while the shaft stands idle
Selection pitfalls — read before you substitute
- Do not preload 608-ZZ to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.
- Mount by heating the inner ring (max 120 °C) — driving 608-ZZ home through the outer ring or balls brinells the raceways.
- Shields on 608-ZZ are non-contact: chips and coarse dust stay out, but water passes straight through — specify the sealed 608-2RS for washdown duty.
- Do not pry the caps off 608-ZZ to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.
- Do not preload 608-ZZ to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.
- Clearance suffixes follow the seal code in the designation stack (e.g. 608-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.
Frequently asked questions
What are the dimensions of 608-ZZ?
The SKF 608-2Z measures 8 mm bore × 22 mm OD × 7 mm width (0.315 × 0.866 × 0.276 in), mass about 13 g. It has two non-contact sheet-metal shields.
How do I read the 608 designation?
Small miniature bearings print the bore as the final digit, so 608 is a 8 mm bearing; the series digits in front give the section (OD/width family).
What is the difference between 608-ZZ and a same-bore 62-series bearing?
Section height differs: 608-ZZ has a 7 mm radial section and C 3.45 kN; always match d, D and B — same bore alone never makes two bearings interchangeable.
Which fits should I use for 608-ZZ?
With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 22 mm housing; reverse the interference if the outer ring rotates.
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018) on 2026-09-27. Read our editorial & correction policy.