| Symbol | Value | Description |
|---|---|---|
| Cr | 640 N | Basic dynamic load rating, radial |
| nG | 49000 rpm | Limiting speed |

NTN
Miniature Ball Bearings
Deep Groove Ball Bearing
RFQ
Estimated delivery: 17 Jul 2026 (domestic stock)
EX-WORKS (Incoterms 2020) Seoul, Korea — Buyer arranges freight, duties, and insurance.
NTN 684ZZ Deep Groove Ball Bearing is a versatile rolling bearing for stable, low-friction rotation in a wide range of industrial equipment. It primarily supports radial load while accommodating moderate axial load in both directions, making it a standard choice for motors, pumps, gearboxes, and general machinery.
The bearing consists of inner and outer rings with deep raceway grooves, balls, and a cage. Open, shielded, or sealed designs can be selected according to contamination, lubrication, and maintenance requirements.
Select by bore, outside diameter, width, sealing type, internal clearance, speed rating, and actual radial/axial load conditions.
| Symbol | Value | Description |
|---|---|---|
| Cr | 640 N | Basic dynamic load rating, radial |
| nG | 49000 rpm | Limiting speed |
| Symbol | Value | Description |
|---|---|---|
| d | 4 mm | Bore diameter |
| D | 9 mm | Outside diameter |
| B | 4 mm | Width |
The same part number can be written with or without separators, or in progressive prefix form. We index these common variants so your search reaches this page:
NTN684ZZNTN 684ZZRFQ
Estimated delivery: 17 Jul 2026 (domestic stock)

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