Address
304 North Cardinal
St. Dorchester Center, MA 02124
Work Hours
Monday to Friday: 7AM - 7PM
Weekend: 10AM - 5PM
Address
304 North Cardinal
St. Dorchester Center, MA 02124
Work Hours
Monday to Friday: 7AM - 7PM
Weekend: 10AM - 5PM

| Model | d | D | B | Structure | Seal | Material |
|---|---|---|---|---|---|---|
| 681CE | 1 | 3 | 1 | Deep Groove | Open | 440C + Si₃N₄ |
| 682CE ZZ | 2 | 5 | 1.5 | Deep Groove | ZZ | 440C + Si₃N₄ |
| 683CE 2RS | 3 | 7 | 2 | Deep Groove | 2RS | 440C + Si₃N₄ |
| 693CE ZZ | 3 | 8 | 3 | Deep Groove | ZZ | 440C + Si₃N₄ |
| 604CE 2RS | 4 | 12 | 4 | Deep Groove | 2RS | 440C + Si₃N₄ |
| R144CE | 3.175 | 6.35 | 2.38 | Deep Groove | Open | 440C + Si₃N₄ |
| Model | d(inch) | d(mm) | D(inch) | D(mm) | B(inch) | B(mm) | Seal | Material |
|---|---|---|---|---|---|---|---|---|
| CR1 | 1/8″ | 3.175 | 3/8″ | 9.525 | 1/8″ | 3.175 | Open | 440C + Si₃N₄ |
| CR1A ZZ | 1/8″ | 3.175 | 1/2″ | 12.700 | 1/8″ | 3.175 | ZZ | 440C + Si₃N₄ |
| CR2 2RS | 3/16″ | 4.762 | 1/2″ | 12.700 | 3/16″ | 4.762 | 2RS | 440C + Si₃N₄ |
| CR4 ZZ | 1/4″ | 6.350 | 5/8″ | 15.875 | 1/4″ | 6.350 | ZZ | 440C + Si₃N₄ |
Ceramic deep groove ball bearings are mostly hybrid structures with 440C stainless steel races and silicon nitride (Si₃N₄) ceramic balls. They deliver ultra-low friction, outstanding high-speed performance, great wear resistance and corrosion resistance. These bearings can bear radial loads and moderate axial loads, run steadily with low noise, and are also electrically insulated. Available in open, ZZ shielded and 2RS sealed types, they are widely used for dental handpieces, RC models, marine equipment, chemical devices and high-speed precision machinery.
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