628-9-2RS bearing: complete specifications & equivalents
The 628-9-2RS is a ISO 15 radial bearing sized 9 x 17 x 5 mm (bore x OD x width) with 2RS sealing. Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 9 mm |
| Outer diameter D | 17 mm |
| Width B | 5 mm |
| Material | GCr15 |
| Seal / shield | 2RS |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 1.43 kN |
| Basic static load rating C0 | 0.64 kN |
| Fatigue load limit Pu | 0.027 kN |
| Limiting speed (mechanical) | 24000 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 4.3 g |
| Manufacturer designation | 628/9-2RS1 |
| 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 & 62800-series range
| Bore d | 0.354 in |
|---|---|
| Outer diameter D | 0.669 in |
| Width B | 0.197 in |
| ISO bore code | — |
| Radial section height (D−d)/2 | 4 mm |
| Smallest bore in 62800-series | 5 mm |
| Largest outer diameter in 62800-series | 24 mm |
| Width range across 62800-series | 4–8 mm |
| Bore position in 62800-series (smallest first) | 5 of 5 |
| Bore above smallest 62800-series size | 4 mm |
Cross references & equivalents
| Equivalent model | Brand | Match level | Note |
|---|---|---|---|
| 628-9-ZZ | SKF | full Dimensions and internal design equivalent — standard interchange. | Same 9×17×5 mm envelope and equivalent catalogue ratings; 628/9-2Z is the two non-contact shields execution of this size — boundary dimensions interchangeable, only the seal/shield/cage execution differs. |
| W628-9-2RS | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 9×17×5 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.43/0.64 kN vs 0.761/0.335 kN) — envelope match, not a load-rating equivalent; choose by corrosion versus load duty. |
| W628-9-ZZ | SKF | partial Main dimensions match; tolerances, seals or internal clearance differ. | Same 9×17×5 mm envelope, but the stainless and chrome-steel executions carry different catalogue ratings (1.43/0.64 kN vs 0.761/0.335 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 628-9-2RS model number is decoded
In the miniature 62800-series, the bore is written directly after the slash as 9 mm (bores below 10 mm use the slash spelling). The envelope is 9×17×5 mm (0.354×0.669×0.197 in) with a 4.0 mm radial section height, C 1.43 kN, C0 0.64 kN and Pu 0.027 kN. SKF catalogues the sealed execution as 628/9-2RS1: two contact elastomer lips (2RS1/2RSH spelling) over a lifetime grease fill; the lips add drag, and no reference (thermal) speed is published. Limiting speed 24000 r/min, catalogue mass 4.3 g. A thin section saves space but leaves little margin for misalignment or shaft deflection.
Typical equipment & failure modes
Common applications
- fractional-horsepower motors
- small fans and blowers
- hand-held power tools
- domestic appliances
Known failure patterns
- contact-seal lip hardening and pre-grease loss after long high-temperature service
- grease-life expiry inside the sealed-for-life cavity, which has no relubrication path
- electrical pitting in VFD-driven motors without shaft grounding
- edge loading from shaft deflection or housing misalignment
Selection pitfalls — read before you substitute
- Clearance suffixes follow the seal code in the designation stack (e.g. 628/9-2Z/C3 in SKF spelling); no suffix means normal CN internal clearance.
- Assign interference to the rotating ring: on a conventional shaft-mounted 9 mm position the inner ring rotates, so use a k5/m6 shaft seat with an H7 housing — reverse the logic if the outer ring rotates.
- Contact seals make 628-9-2RS slower than the open 628/9 (limiting 24000 r/min) and forbid solvent washing, which destroys the lifetime grease.
- Do not pry the caps off 628-9-2RS to repack it; shield/seal damage leaves a gap that throws grease and admits dirt.
- Deep-groove geometry tolerates only minutes of misalignment; if the 17 mm housing bore cannot be aligned, move to a self-aligning bearing rather than shimming 628-9-2RS.
- Do not preload 628-9-2RS to silence it: a deep-groove ball bearing is not angular-contact, and axial preload only raises temperature and shortens grease life.
Frequently asked questions
What are the dimensions of 628-9-2RS?
The SKF 628/9-2RS1 measures 9 mm bore × 17 mm OD × 5 mm width (0.354 × 0.669 × 0.197 in), mass about 4.3 g. It has two contact rubber seals and a lifetime grease fill.
Why is there a slash in the designation 628/9-2RS1?
The slash writes a bore that falls outside the two-digit code table: 628/9 means 9 mm bore. The site slug 628-9-2RS replaces the slash with a hyphen.
Which fits should I use for 628-9-2RS?
With a rotating inner ring use roughly j5/k5 on the shaft and H7 in the 17 mm housing; reverse the interference if the outer ring rotates.
How heavy is 628-9-2RS?
Catalogue mass is 4.3 g for 628/9-2RS1; seal and cage executions of the same envelope differ by a few grams.
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.