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KOYO 6311ZZC3 Deep Groove Ball Bearings
KOYO 6311ZZC3 single-row deep groove ball bearing – shielded (zz). Bore 55mm x OD 120mm x width 29mm. Dynamic load rating 89.5 kN. C3 internal clearance.
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| Brand | Koyo JTEKT |
|---|---|
| Bearing Type | Deep Groove Ball Bearings |
| Series | 6311 |
| Inner Diameter (Bore) | 55 mm |
| Outer Diameter | 120 mm |
| Width | 29 mm |
| Seal Type | ZZ |
| Material | Chrome Steel (AISI 52100) |
| Clearance | C3 |
| Dynamic Load Rating (Cr) | 89500 N (89.5 kN) |
| Static Load Rating (C₀) | 45000 N |
| Limiting Speed (Grease) | 5600 rpm |
| Limiting Speed (Oil) | 6700 rpm |
| Fillet Radius (r min) | 2 mm |
| Fatigue Load Limit (Cu) | 3.45 kN |
| Weight | 1.37 kg |
The KOYO 6311ZZC3 is a single-row deep groove ball bearing with double metal shields (ZZ) – measuring 55mm bore x 120mm outside diameter x 29mm width.
Load ratings: dynamic 89.5 kN (Cr) and static 45.0 kN (C0r) – fatigue load limit 3.45 kN. Limiting speed 5600 rpm with grease lubrication and 6700 rpm with oil lubrication. Minimum fillet radius 2mm.
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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