208 bearing: complete specifications & equivalents
The 208 is a ISO 15 radial bearing sized 40 x 80 x 18 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 40 mm |
| Outer diameter D | 80 mm |
| Width B | 18 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 33.6 kN |
| Basic static load rating C0 | 27 kN |
| Fatigue load limit Pu | 1.16 kN |
| Reference speed (thermal) | 15000 rpm |
| Limiting speed (mechanical) | 9500 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 390 g |
| Manufacturer designation | 208 |
| 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 & 200-series range
| Bore d | 1.575 in |
|---|---|
| Outer diameter D | 3.15 in |
| Width B | 0.709 in |
| ISO bore code | 08 |
| Radial section height (D−d)/2 | 20 mm |
| Smallest bore in 200-series | 30 mm |
| Largest outer diameter in 200-series | 180 mm |
| Width range across 200-series | 16–34 mm |
| Bore position in 200-series (smallest first) | 3 of 15 |
| Bore above smallest 200-series size | 10 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| W6208-2RS | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 40×80×18 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (33.6/27 kN vs 25.1/17.6 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty. |
| W6208-ZZ | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 40×80×18 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (33.6/27 kN vs 25.1/17.6 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty. |
| W6208 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 40×80×18 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (33.6/27 kN vs 25.1/17.6 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty. |
| 208-ZZ | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 40×80×18 mm envelope and equivalent catalogue ratings; 208-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs. |
| 6208 | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF SKF 6208 shares the 40×80×18 mm envelope but catalogue C/C0 differ (33.6/27 kN vs 32.5/19 kN) — envelope match, not a load-rating equivalent. |
| 6208-ZZ | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF SKF 6208-2Z shares the 40×80×18 mm envelope but catalogue C/C0 differ (33.6/27 kN vs 32.5/19 kN) — envelope match, not a load-rating equivalent. |
| 6208-2RS | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF SKF 6208-2RSH shares the 40×80×18 mm envelope but catalogue C/C0 differ (33.6/27 kN vs 32.5/19 kN) — envelope match, not a load-rating equivalent. |
| 6208-RSR | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | SKF SKF 6208-2RZ shares the 40×80×18 mm envelope but catalogue C/C0 differ (33.6/27 kN vs 32.5/19 kN) — envelope match, 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 208 model number is decoded
208 is a filling-slot (notched-ring) deep-groove bearing in the legacy 200-series: the last two digits encode the bore: 208 carries code 08 = 40 mm (code × 5). The rings carry loading slots that allow extra balls during assembly, which is what gives the 40×80×18 mm envelope its C 33.6 kN and C0 27 kN ratings (Pu 1.16 kN). The open 208 carries no shields or seals and relies on application lubrication and external sealing. Limiting speed 9500 r/min, mass 390 g. These bearings are built for high purely-radial loads at moderate speeds.
Typical equipment & failure modes
Common applications
- eccentric and vibratory conveyors
- legacy machinery repairs
- slew drives
- material-handling winches
Known failure patterns
- spalling of the filling-slot edge when balls are hammered through the slot under heavy thrust loading
- dirt entering through the open slot area when external sealing is neglected
- edge loading from shaft deflection or housing misalignment
- rolling-contact fatigue spalling once the catalogue L10 life is exceeded
Selection pitfalls — read before you substitute
- The slots sit at one angular position: on 208, never pass the full radial load across the slot zone during mounting or the ring lip can crack.
- 208 uses the legacy SKF 200/300 numbering (light/heavy filling-slot series), not the modern 6200/6300 spelling; quote 208 exactly when ordering replacements.
- Filling-slot bearings take heavy purely-radial load at moderate speed but little thrust; the 33.6/27 kN ratings assume radial loading — use deep-groove 6xxx where axial load matters.
- Shields on 208 retain grease but do not seal against water; for wet farm duty add external lip seals rather than trusting the shield.
- The slots sit at one angular position: on 208, never pass the full radial load across the slot zone during mounting or the ring lip can crack.
- The fatigue load limit is 1.16 kN; it feeds the equivalent-mean-load check, not the basic life calculation — do not substitute one for the other.
Frequently asked questions
What are the dimensions of 208?
Filling-slot bearing 208 measures 40×80×18 mm (1.575×3.15×0.709 in), about 390 g.
What does the designation 208 mean?
It is the legacy 200/300 filling-slot numbering: series 200 and bore code 08 = 40 mm. Filling-slot bearings predate the 6xxx deep-groove spelling.
Can 208 take axial load?
Very little: the filling slots interrupt the raceway shoulders, so thrust towards the open slot side can unload or jam the balls. Use a standard deep-groove 6xxx bearing for combined loads.
Why use an old 200-series bearing instead of a 62xx?
For slow, heavy, purely-radial duty the extra balls give more capacity in the same bore, and the separable rings simplify assembly in blind housings; at high speed modern designs run better.
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.