608 bearing: complete specifications & equivalents
The 608 is a ISO 15 radial bearing sized 8 x 22 x 7 mm (bore x OD x width). 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 | open |
| 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) | 48000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 12 g |
| Manufacturer designation | 608 |
| 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 |
|---|---|---|---|
| 608-2RS | 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. |
| 608-ZZ | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 8×22×7 mm envelope and equivalent catalogue ratings; 608-2Z is the two non-contact shields 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 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. The open 608 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 48000 r/min, catalogue mass 12 g.
Typical equipment & failure modes
Common applications
- fractional-horsepower motors
- small fans and blowers
- hand-held power tools
- domestic appliances
Known failure patterns
- contamination wear when the open arrangement is used without external seals
- lubricant starvation where no regreasing interval is maintained
- fretting corrosion on a creeping shaft or housing seat
- cage damage from running beyond the limiting speed
Selection pitfalls — read before you substitute
- Fillet radii must clear the 608 chamfer so the 7 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
- Fillet radii must clear the 608 chamfer so the 7 mm-wide ring seats square; an oversized shaft radius creates point contact on the ring face.
- Open 608 needs external sealing at the arrangement level; in dusty housings its life depends entirely on those external seals and the regreasing schedule.
- Plan a relubrication interval for 608; run-to-failure on open deep-groove bearings is the dominant early-failure cause.
- 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.
- At 8 mm bore, C3 clearance is the safe choice when interference fits plus temperature rise consume the CN clearance; a hot tight bearing with no residual clearance fails fast.
Frequently asked questions
What are the dimensions of 608?
The SKF 608 measures 8 mm bore × 22 mm OD × 7 mm width (0.315 × 0.866 × 0.276 in), mass about 12 g. It is open, with no shields or seals.
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 load can 608 take?
Catalogue values for 608: dynamic C 3.45 kN, static C0 1.37 kN, fatigue limit Pu 0.057 kN. Use C in life calculation and C0 for static checks at 8 mm bore.
What is the speed rating of 608?
SKF lists a 75000 r/min thermal reference speed and a 48000 r/min mechanical limiting speed for 608; real limits also depend on lubrication and fits.
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.