628 ZZ Silent Bearings are used in household appliances for noiseless bearings
The 628 ZZ is an ultra-quiet, double-shielded deep groove ball bearing specifically designed for noise-sensitive household appliances. With 8×24×8 mm (ID×OD×W) dimensions, this bearing delivers virtually silent operation (<15 dB) while maintaining long service life in washing machines, refrigerators, air purifiers, and small kitchen appliances.
Engineered with special noise-dampening technology, it features precision-polished raceways and optimized cage designs to eliminate operational sounds. The dual metal shields (ZZ) provide lifetime lubrication retention while preventing dust ingress in appliance environments.
Technical Specifications & Dimensions
| Parameter | Specification |
|---|---|
| Model | 628 ZZ |
| Type | Deep Groove Ball Bearing |
| Dimensions | 8×24×8 mm (ID×OD×W) |
| Material | Chrome Steel (GCr15) / Optional Stainless Steel (SUS420) |
| Shield Type | Double Metal Shields (ZZ) |
| Clearance | C2 (Tighter than standard) |
| Precision Grade | ABEC-5 (Special Silent Grade) |
| Dynamic Load | 4.2 kN |
| Static Load | 2.0 kN |
| Max Speed | 12,000 RPM (Grease) |
| Noise Level | <15 dB at 1,500 RPM |
| Temperature Range | -30°C to +150°C |
| Lubrication | Special Silent Grease (NSF H1 certified) |
| L10 Life | 30,000 hours @ 1,800 RPM |
Key Features
✔ Whisper-Quiet Operation – <15 dB noise level for silent homes
✔ Vibration Control – Precision-balanced for smooth appliance performance
✔ Appliance-Grade Lubricant – NSF H1 food-safe grease option available
✔ Dual Protection – ZZ shields prevent lint/dust ingress in laundry apps
✔ Corrosion-Resistant – Optional stainless steel for humid environments
Household Applications
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