Overview
The SKF NJ 311 ECJ/C3 is a single-row cylindrical roller bearing engineered for demanding industrial applications requiring high radial load capacity and stable operation at speed. Manufactured to ISO standards, this bearing combines precision engineering with robust durability for motion control and power transmission systems in manufacturing, automotive, heavy equipment, and general machinery applications.
Key Features
- Separable Design: Inner ring separates for easy mounting and component interchange
- High Radial Load Capacity: Cylindrical roller design optimizes load distribution and facilitates high radial load capacity
- Low Friction & Longer Service Life: The logarithmic roller profile reduces edge stresses at the roller/raceway contact and sensitivity to misalignment and shaft deflection
- Flanged Configuration: Two integral flanges on the outer ring and one on the inner ring accommodate axial displacement in one direction
- High-Speed Capable: The cage design is suitable for high speeds, rapid accelerations and peak loads
Technical Specifications
- Bore Diameter (ID): 55 mm
- Outer Diameter (OD): 120 mm
- Width: 29 mm
- Bearing Type: Single-Row Cylindrical Roller
- Cage Material: Pressed Steel
- Radial Internal Clearance: C3 (Greater than normal)
- Precision Class: ISO Class 6 (RBEC 3)
- Limiting Speed: 7000 rpm
- Reference Speed: 6000 rpm
- Dynamic Load Rating: 156 kN
- Static Load Rating: 143 kN
- Weight: 3.378 lb
- Closure Type: Open
- Lubrication: Grease or oil required
Typical Applications
The NJ 311 ECJ/C3 bearing is suited for:
- Manufacturing equipment and production line machinery
- Automotive transmission and driveline components
- Industrial gearboxes and speed reducers
- Heavy equipment and earthmoving machinery
- General machinery requiring high radial load capacity
- High-speed applications with stable rotational demands
Compatibility & Replacements
Compatible With
- Shafts 55 mm nominal bore diameter
- Housings designed for NJ 311 series cylindrical roller bearings
- Equipment requiring ISO Class 6 precision-rated bearings
- Applications using standard grease or oil lubrication systems
- Industrial machinery and power transmission systems (automotive, manufacturing, heavy equipment)
Replaces / Drop-In Replacement For
- SKF NJ 311 ECJ (without C3 clearance designation)
- Other NJ 311-series cylindrical roller bearings with equivalent bore/OD dimensions
- Comparable single-row cylindrical roller bearings from other manufacturers with matching dimensional specifications
Works With
- Standard greases and oils for roller bearing lubrication
- SKF lubricant products (greases and oils) recommended for bearing systems
- Conventional bearing mounting and dismounting tools
- Industrial machinery requiring ISO Class 6 precision
- Both sealed and open lubrication systems
