NSK 6217zz, 6218zz, 6219zz are deep groove ball bearings with double metal shields (ZZ), designed for high-speed operations and moderate radial/axial loads. Key parameters:
| Model | Inner Diameter (mm) | Outer Diameter (mm) | Width (mm) | Dynamic Load (kN) | Static Load (kN) | Max Speed (rpm) |
|---|---|---|---|---|---|---|
| 6217zz | 85 | 150 | 28 | 83.5 | 53.0 | 6,000 |
| 6218zz | 90 | 160 | 30 | 95.5 | 64.0 | 5,600 |
| 6219zz | 95 | 170 | 32 | 108 | 73.5 | 5,300 |
Key Differences: Larger models (e.g., 6219zz) handle higher loads but at slightly lower speeds. Shield design prevents contamination without affecting speed.
These bearings are widely used in:
6218zz bearings are installed in 5.5kW induction motors to support 4,800 rpm operations. Benefits include 20% lower heat generation vs. competitors.
6219zz bearings in mining conveyors reduce downtime by 35% due to dust resistance and 108kN dynamic load capacity.
Problem: Frequent bearing failures in 10kW motors due to overheating.
Solution: Switched to NSK 6217zz bearings with grease lubrication.
Result: Motor lifespan increased from 6 to 15 months; ROI achieved in 4 months.
Problem: Contamination in food processing pumps caused 3-hour daily downtime.
Solution: Installed 6218zz bearings with enhanced sealing.
Result: Downtime reduced by 80%; annual savings: €46,000.
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