684
The 684 is a deep groove ball bearing with bore 4mm, outer diameter 9mm, and width 2.5mm rated for dynamic load 0.5 kN.
📋 Technical Specifications
| Bearing type | Deep Groove Ball Bearings |
| Series | 6700 / 6800 / 6900 Thin-Section Series |
| Seal type | Confirm per inquiry |
| Material | Confirmed per inquiry — grade and certificate availability reviewed before quotation |
| Bore type | Confirmed per drawing |
| Dimension unit | millimeter (mm) |
📋 Nominal Variants by Seal Type
Catalog variants open a detail page. Inquiry-only configurations go directly to RFQ.
| Seal Type | Model Code | Typical Use | |
|---|---|---|---|
| Double metal shields | 684 ZZ (inquiry only) | General dust protection | Quote → |
| Double contact rubber seals | 684 2RS (inquiry only) | Dust and moisture protection at moderate speed | Quote → |
| Double non-contact rubber seals | 684 2RZ (inquiry only) | Lower-friction sealing at higher speed | Quote → |
| C3 radial clearance | 684 C3 (inquiry only) | Motors and applications with higher operating temperature | Quote → |
📐 Detailed Dimensions
Basic dimensions (mm)
| Bore diameter (d) | 4 |
| Outer diameter (D) | 9 |
| Width (B) | 2.5 |
Corner radius, shoulder dimensions, fits and tolerances are confirmed against the requested suffix and application drawing before quotation.
📑 Drawings & 3D Model
Drawings and 3D models are provided per inquiry. Tell us your application and we will send the appropriate file format (DXF, DWG, STEP, IGES).
⚡ Source-Data Reference Speed
Lubrication method and application speed limit are confirmed per inquiry; no oil-speed value is derived from this number.
⇄ Same-size Bearings & Reference Options
The models below share the 4x9x2.5 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.
🔄 Related Models
Same bearing family or similar dimensions.
Same model family — dimensions may differ⚙ Typical Applications
Why choose NLHB?
NLHB supports both in-house manufacturing and qualified partner sourcing. We confirm the specification, supply route, inspection requirements, and available documentation before quotation.
About NLHB →❓ Frequently Asked Questions
Get a quote for 684
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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