Overview
The SKF 3311 A/C3 is a precision double-row angular contact ball bearing designed for demanding industrial applications. This bearing combines two rows of rolling elements at a 30° contact angle to handle high radial and axial loads in both directions. Built with SKF’s Explorer-series precision and durable bearing steel, the 3311 A/C3 provides reliable performance in machine tools, pumps, motors, and transmission systems.
Key Features
- Double-row configuration handles combined radial and axial loads bidirectionally
- 30° contact angle optimizes axial load capacity and rigidity
- C3 internal clearance for normal to light preload applications
- Open design allows user-applied lubrication for flexibility
- Metal cage construction for durability and reliability
- Back-to-back arrangement requires less space than two single-row bearings
Technical Specifications
- Bore Diameter: 55 mm
- Outside Diameter: 120 mm
- Width: 49.2 mm
- Bearing Type: Double-row angular contact ball bearing
- Number of Rows: 2
- Contact Angle: 30°
- Internal Clearance: C3
- Radial Dynamic Load Capacity: 112 kN
- Radial Static Load Capacity: 81.5 kN
- Maximum Speed: 5,300 rpm
- Material: Bearing steel with metal cage
- Closure: Open (unsealed)
- Weight: 2.27 kg (5.08 lbs)
- Fillet Radius: 2 mm
Typical Applications
- Machine tool spindles requiring high speed and precision
- Gearbox shafts handling combined loads
- Pump and compressor drive shafts
- Electric motor bearing sets
- Automotive transmission systems
- Material handling conveyor drives
- Railway wheelsets and traction motors
Compatibility & Replacements
Compatible With
- Any mounting system designed for 55 mm bore diameter shafts
- Standard industrial bearing housings with 120 mm bore support surface
- Oil or grease lubrication systems
- General-purpose machinery requiring angular contact bearings
Replaces / Drop-In Replacement For
- SKF 3311-A (without C3 clearance)
- SKF 3311 (standard series)
- FAG and NSK equivalent 3311-series double-row angular contact bearings
Works With
- User-applied grease or oil lubrication systems
- Industrial bearing maintenance programs
- Standard shaft and housing fits per ISO 286 tolerances
- Back-to-back and face-to-face mounting arrangements
