Machine tool builders can choose from different levels or classes of bearing precision to meet their specific requirements. Timken tapered roller bearings are available in a complete range of precision classes. This table provides broad guidelines for bearing class selection.
From lowest to highest precision
Class C / 3
- Low precision machines
- Drills
- Conventional lathes
- Milling machines
- Precision gear drives
Class B / 0
- NC lathes
- Milling/boring machines
- Machining centers
Class A / 00
- Grinding machines
- Jig boring machines
- Workpiece spindles (cylindrical grinder)
Class AA / 000
- High accuracy machines
- Precision measuring instruments
- Special applications