The SF684 2rs is a deep groove ball bearing with bore 4mm, outer diameter 9mm, and width 4mm rated for dynamic load 0.5 kN.
| Bearing type | Deep Groove Ball Bearings |
| Series | F684 |
| Seal type | Sealed |
| Material | Confirmed per inquiry — grade and certificate availability reviewed before quotation |
| Bore type | Confirmed per drawing |
| Dimension unit | millimeter (mm) |
Catalog variants open a detail page. Inquiry-only configurations go directly to RFQ.
| Seal Type | Model Code | Typical Use | |
|---|---|---|---|
| Open | SF684 | High speed in clean environments | Quote → |
| Double metal shields | SF684 ZZ (inquiry only) | General dust protection | Quote → |
| Double contact rubber seals | SF684 2RS (inquiry only) | Dust and moisture protection at moderate speed | Quote → |
| Double non-contact rubber seals | SF684 2RZ (inquiry only) | Lower-friction sealing at higher speed | Quote → |
| C3 radial clearance | SF684 C3 (inquiry only) | Motors and applications with higher operating temperature | Quote → |
| Bore diameter (d) | 4 |
| Outer diameter (D) | 9 |
| Width (B) | 4 |
Corner radius, shoulder dimensions, fits and tolerances are confirmed against the requested suffix and application drawing before quotation.
Drawings and 3D models are provided per inquiry. Tell us your application and we will send the appropriate file format (DXF, DWG, STEP, IGES).
Lubrication method and application speed limit are confirmed per inquiry; no oil-speed value is derived from this number.
The models below share the 4x9x4 mm boundary dimensions. Matching d/D/B alone does not prove interchangeability; verify seals, clearance, ring features, load ratings, fits, and application conditions before replacement.
| Model | Relationship | Series | Seal | Action |
|---|---|---|---|---|
| 684 2rs | Same boundary dimensions — verify fit/load | Metric Miniature Series | Sealed | Quote → |
| 684A ZZ | Same boundary dimensions — verify fit/load | Extra Small / Miniature Deep Groove Ball Bearing | Metal Shields | Quote → |
| 684AZZ1 | Same boundary dimensions — verify fit/load | 6700 / 6800 / 6900 Thin-Section Series | Metal Shields | Quote → |
| 684zz | Same boundary dimensions — verify fit/load | Metric Miniature Series | Shielded | Quote → |
| F4-9 | Different outer-ring feature | Miniature Thrust Series | Open | Quote → |
| F4-9M | Different outer-ring feature | Miniature Thrust Series | Open | Quote → |
| F684 | Different outer-ring feature | Standard Flanged Bearings | Sealed | Quote → |
| F684 2rs | Different outer-ring feature | F684 | Sealed | Quote → |
| F684 ZZ | Different outer-ring feature | F684 | Metal Shields | Quote → |
| F684ZZ | Different outer-ring feature | Standard Flanged Bearings | Shielded | Quote → |
| SF684zz | Configuration variant | F684 | Shielded | Quote → |
Same bearing family or similar dimensions.
Same model family — dimensions may differNLHB supports both in-house manufacturing and qualified partner sourcing. We confirm the specification, supply route, inspection requirements, and available documentation before quotation.
About NLHB →Send us your quantity, application and target lead time. We confirm spec, interchange and realistic delivery — no order confirmed until you approve.
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