Overview
The SKF 6311/C3 is a premium deep groove radial ball bearing from the 6300 series, designed for high-speed, low-friction applications in industrial machinery and motion control systems. This single-row bearing features a 55 mm bore diameter, 120 mm outer diameter, and 29 mm width, with C3 internal clearance fit optimized for moderate-to-high rotational speeds.
Key Features
- Deep groove radial ball bearing design accommodates loads in multiple directions
- C3 clearance fit rated for high-speed operation up to 8000 rpm
- Low friction and vibration characteristics enable smooth, quiet operation
- Open closure design with steel cage and bearing steel construction
- ABEC 1 precision grade meets industrial equipment standards
- Minimal maintenance required; easy to install and remove
Technical Specifications
- Bore Diameter: 55 mm
- Outside Diameter: 120 mm
- Width: 29 mm
- Internal Clearance: C3 (enlarged)
- Maximum Speed: 8000 rpm
- Radial Dynamic Load Capacity: 16,658 lbf (74.1 kN)
- Radial Static Load Capacity: 10,116 lbf
- Cage Type: Sheet metal
- Precision Class: ABEC 1
- Closure Type: Open
- Weight: 1.34 kg (3.01 lbs)
Typical Applications
The SKF 6311/C3 is commonly used in:
- Electric motor shafts and pump assemblies
- Conveyor systems and material handling equipment
- Industrial fans and blowers
- Compressors and turbomachinery
- Machine tool spindles
- Agricultural and construction equipment
Compatibility & Replacements
Compatible With
- Standard deep groove ball bearing pillow blocks and cartridge housings
- Sealed and shielded housing designs (6311-2RS, 6311-Z variants)
- Industrial bearing housings rated for 55 mm bore diameter
- Equipment OEM specifications calling for 6300 series bearings
Replaces / Drop-In Replacement For
- FAG 6311.C3 (cross-reference)
- Original SKF 6311/C3 units in existing equipment
- Equivalent 55x120x29 deep groove bearings with C3 clearance
Works With
- All standard bearing lubrication systems (grease and oil)
- SKF and third-party bearing maintenance and installation tools
- Sealed variants (6311-2RS1, 6311-2Z, 6311-2RSH) for different sealing requirements
- Industrial reliability and condition monitoring programs
