NSK 6219ZZ, 6220ZZ, 6221ZZ Deep Groove Ball Bearings with double metal shields (ZZ) for high-speed, low-noise applications in machine tools and Engineered for precision and durability.
[1] NSK 6219ZZ bearing - wikipedia
[9] Genuine NSK Japan 6221 Deep Groove Ball Bearing 105mm
NSK 6219zz, 6220zz, and 6221zz are single-row deep groove ball bearings designed for high-speed performance and radial/axial load support. These bearings feature steel shields (zz) for contamination protection and are widely used in machine tools, industrial motors, and precision equipment. These bearings feature steel shields (zz) for contamination protection and are widely used in machine tools, industrial motors, and precision equipment.
| Model | Inner Diameter (mm) | Outer Diameter (mm) | Width (mm) | Dynamic Load (kN) | Static Load (kN) | Max Speed (rpm) |
|---|---|---|---|---|---|---|
| 6219zz | 95 | 170 | 32 | 82.5 | 53.0 | 6,000 |
| 6220zz | 100 | 180 | 34 | 92.3 | 60.5 | 5,600 |
| 6221zz | 105 | 190 | 36 | 102.0 | 68.0 | 5,300 |
NSK 6220zz bearings are installed in CNC lathe spindles to reduce friction during high-speed turning operations. Their steel shields prevent metal Their steel shields prevent metal chips from entering, extending service life by 30% compared to open bearings.
6219zz bearings handle combined radial and axial loads in gearboxes, maintaining alignment under 12,000 N-m torque. Users report a 20% reduction in downtime due to their sealed design. Users report a 20% reduction in downtime due to their sealed design.
6221zz bearings are used in composite material cutting machines, operating at 4,800 rpm with ±2μm runout accuracy, meeting AS9100 standards.
Robotic welding arms utilize 6219zz bearings for smooth articulation, achieving 98% uptime in 24/7 production environments.
Challenge. Frequent bearing failures in high-speed milling centres (8,000+ rpm).
Solution. Upgraded to NSK 6220zz bearings with grease-purged shields.
Result. 18-month operation without replacement, vibration levels reduced to ISO 1940 G2.5.
Challenge. Lubricant leakage in 55kW motors causing 15% failure rate.
Solution. Implemented 6219zz bearings with non-contact seals.
Result. Zero lubrication-related failures over 2 years, energy efficiency improved by 4%.
Challenge. Bearing contamination in PCB assembly robots.
Solution. Deployed 6221zz bearings with customised labyrinth seals.
Result. MTBF increased from 6,000 to 14,000 hours.
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