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KOYO 63/28ZZC3 Deep Groove Ball Bearings
KOYO 63/28ZZC3 single-row deep groove ball bearing – shielded (zz). Bore 28mm x OD 68mm x width 18mm. Dynamic load rating 29.4 kN. C3 internal clearance.
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| Brand | Koyo JTEKT |
|---|---|
| Bearing Type | Deep Groove Ball Bearings |
| Series | 63/28 |
| Inner Diameter (Bore) | 28 mm |
| Outer Diameter | 68 mm |
| Width | 18 mm |
| Seal Type | ZZ |
| Material | Chrome Steel (AISI 52100) |
| Clearance | C3 |
| Dynamic Load Rating (Cr) | 29400 N (29.4 kN) |
| Static Load Rating (C₀) | 13100 N |
| Limiting Speed (Grease) | 10000 rpm |
| Limiting Speed (Oil) | 12000 rpm |
| Fillet Radius (r min) | 1.1 mm |
| Fatigue Load Limit (Cu) | 0.990 kN |
| Weight | 0.328 kg |
The KOYO 63/28ZZC3 is a single-row deep groove ball bearing with double metal shields (ZZ) – measuring 28mm bore x 68mm outside diameter x 18mm width.
Load ratings: dynamic 29.4 kN (Cr) and static 13.1 kN (C0r) – fatigue load limit 0.990 kN. Limiting speed 10000 rpm with grease lubrication and 12000 rpm with oil lubrication. Minimum fillet radius 1.1mm.
Deep groove ball bearings are the most widely used bearing type – carrying radial and axial loads in both directions with low friction and high running accuracy. The metal shields retain the factory-filled grease and keep out dust and debris while allowing higher speeds than a contact seal.
C3 internal clearance: this bearing is supplied with greater than normal (CN) internal radial clearance. C3 suits applications with an interference fit on the shaft or in the housing – a temperature differential between the inner and outer rings – or shaft expansion under load – where the extra clearance prevents the bearing from becoming preloaded in service.
Manufactured by KOYO (JTEKT) in chrome steel to ISO standards.
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