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KOYO 6318ZZXC3 Deep Groove Ball Bearings
KOYO 6318ZZXC3 single-row deep groove ball bearing – shielded (zzx). Bore 90mm x OD 190mm x width 43mm. Dynamic load rating 178 kN. C3 internal clearance.
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| Brand | Koyo JTEKT |
|---|---|
| Bearing Type | Deep Groove Ball Bearings |
| Series | 6318 |
| Inner Diameter (Bore) | 90 mm |
| Outer Diameter | 190 mm |
| Width | 43 mm |
| Seal Type | ZZX |
| Material | Chrome Steel (AISI 52100) |
| Clearance | C3 |
| Dynamic Load Rating (Cr) | 178000 N (178 kN) |
| Static Load Rating (C₀) | 107000 N |
| Limiting Speed (Grease) | 3500 rpm |
| Limiting Speed (Oil) | 4200 rpm |
| Fillet Radius (r min) | 3 mm |
| Fatigue Load Limit (Cu) | 8.80 kN |
| Weight | 4.91 kg |
The KOYO 6318ZZXC3 is a single-row deep groove ball bearing with double metal shields (ZZX) – measuring 90mm bore x 190mm outside diameter x 43mm width.
Load ratings: dynamic 178 kN (Cr) and static 107 kN (C0r) – fatigue load limit 8.80 kN. Limiting speed 3500 rpm with grease lubrication and 4200 rpm with oil lubrication. Minimum fillet radius 3mm.
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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