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NACHI 6311ZZEC3 Deep Groove Ball Bearings
NACHI 6311ZZEC3 deep groove ball bearing. 55mm ID x 120mm OD x 29mm width. ZZE with C3 clearance. Chrome steel construction.
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- C3 clearance accommodates thermal expansion in hot-running applications
- Chrome steel (AISI 52100) rings and balls for durability and fatigue resistance
- Conforms to ISO dimension standards and interchanges with equivalent series
- Double metal shields (ZZE) protect against dust and debris on both sides while retaining the factory-filled grease
- Handles both radial and moderate axial loads in either direction
- High-speed capability with low noise and vibration
- Operating temperature range: -25°C to +120°C (standard grease)
- Pre-lubricated with high-performance grease - ready to install
| Brand | NACHI |
|---|---|
| Bearing Type | Deep Groove Ball Bearings |
| Series | 6311 |
| Inner Diameter (Bore) | 55 mm |
| Outer Diameter | 120 mm |
| Width | 29 mm |
| Seal Type | ZZE |
| Material | Chrome Steel (AISI 52100) |
| Clearance | C3 |
| Dynamic Load Rating (Cr) | 71500 N (71.5 kN) |
| Static Load Rating (C₀) | 44500 N |
| Limiting Speed (Grease) | 5800 rpm |
| Limiting Speed (Oil) | 6800 rpm |
| Fillet Radius (r min) | 2 mm |
| Weight | 1.37 kg |
| Features & Benefits | C3 clearance accommodates thermal expansion in hot-running applications Chrome steel (AISI 52100) rings and balls for durability and fatigue resistance Conforms to ISO dimension standards and interchanges with equivalent series Double metal shields (ZZE) protect against dust and debris on both sides while retaining the factory-filled grease Handles both radial and moderate axial loads in either direction High-speed capability with low noise and vibration Operating temperature range: -25°C to +120°C (standard grease) Pre-lubricated with high-performance grease - ready to install |
NACHI 6311ZZEC3 Deep Groove Ball Bearings
The NACHI 6311ZZEC3 is a high-quality single-row deep groove ball bearing engineered to deliver reliable performance across a broad spectrum of industrial and commercial applications. With a bore diameter of 55 mm, outer diameter of 120 mm, and a width of 29 mm, this bearing conforms to ISO dimension standards and is a direct interchange for equivalent series bearings from other manufacturers.
Design & Construction
Manufactured by NACHI – one of Japan’s leading bearing producers – the 6311ZZEC3 is precision-ground from high-carbon chromium bearing steel (AISI 52100 / JIS SUJ2), heat-treated to achieve optimum hardness and fatigue resistance. The deep raceway grooves in both the inner and outer rings enable the bearing to support radial loads as well as moderate axial loads in either direction. Double metal shields (ZZE) protect against dust and debris on both sides while retaining the factory-filled grease.
Performance
Rated for a basic dynamic load capacity of 71.5 kN and a static load capacity of 44.5 kN, this bearing delivers dependable load-carrying ability and long calculated service life under correct operating conditions. Permissible speeds reach 5,800 rpm with grease lubrication and 6,800 rpm with oil lubrication, making it well suited to high-speed rotating equipment. This variant features C3 internal clearance – a wider-than-standard radial play that accommodates thermal expansion in elevated-temperature environments such as electric motors, dryers, and heat-intensive machinery.
Typical Applications
- Electric motors, generators, and alternators
- Pumps, compressors, and blowers
- Conveyor and material-handling systems
- Agricultural and farming equipment
- Power tools and woodworking machinery
- Automotive ancillaries – water pumps, tensioners, idlers
- HVAC fans, air-conditioning units, and refrigeration
- Food and beverage processing machinery
- Gearboxes, reducers, and transmission assemblies
- General industrial and workshop machinery
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