71908 ACDGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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Product Overview and Core Advantages
The 71908 ACDGA/P4A is a high-precision angular contact ball bearing designed for applications demanding exceptional accuracy and performance. This single bearing features an extra light preload (Class A) and P4A tolerance class, making it ideal for high-speed spindles and precision machinery. Its 25° contact angle provides superior axial load capacity while maintaining excellent radial load handling. The bearing is universally matchable (SU), allowing for flexible mounting arrangements in sets to achieve desired rigidity and precision levels.
71908 ACDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
- 71908: Basic bearing series designation
- AC: Angular Contact design
- D: Contact angle of 25°
- GA: Universal matching bearing (can be mounted in any combination)
- P4A: High precision tolerance class exceeding ABEC 7 standards
Structural Features and Performance Benefits
High Precision Construction: Manufactured to P4A tolerance class with extremely tight dimensional control (bore and OD tolerance: -0.004mm to 0), ensuring minimal runout and vibration for precision applications.
Optimized Load Capacity: The 25° contact angle enables efficient handling of combined radial and axial loads, with a dynamic load rating of 2632 lbf and static load rating of 1800 lbf.
High-Speed Performance: Features a phenolic resin cage that reduces friction and enables operation at limiting speeds up to 41,000 rpm, making it suitable for high-speed machining applications.
Precision Matching Capability: As a universally matchable bearing (SU), it can be mounted in various preload configurations (typically in sets of 3) to achieve optimal system stiffness and thermal stability.
71908 ACDGA/P4A Bearing Typical Application Areas
The 71908 ACDGA/P4A is specifically engineered for high-precision applications including:
- Machine tool spindles for CNC machining centers
- High-speed grinding spindles
- Precision robotic systems
- Medical equipment spindles
- Aerospace positioning systems
- Semiconductor manufacturing equipment
