71908 ACBGA/HCP4AL
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71908 ACBGA/HCP4AL Bearing Product Overview & Core Advantages
The 71908 ACBGA/HCP4AL is a high-precision, single-row angular contact ball bearing engineered for applications demanding exceptional accuracy and high-speed performance. Its defining feature is the 25° contact angle and ceramic ball construction, which enables it to handle significant combined loads (radial and axial) simultaneously. Manufactured to P4A super-precision tolerance and featuring a phenolic cage, this bearing is optimized for ultra-high rigidity and smooth operation at limiting speeds up to 56,000 rpm. It is pre-lubricated and available as a Universal Matchable (SU) bearing, allowing for precise duplex set configurations to achieve optimal preload and system stiffness.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71908 | Basic bearing series and size designation (40mm bore, 62mm OD, 12mm width). |
| AC | Angular Contact design. |
| B | 40° contact angle (Note: Specification states 25°, this is a model designation nuance). |
| GA | Indicates a specific internal design and preload level (Extra light / Class A). |
| HC | Hybrid Ceramic, signifying the use of ceramic balls. |
| P4A | The tolerance class, denoting super-precision levels for runout and dimensions. |
71908 ACBGA/HCP4AL Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic (Si3N4) balls significantly reduces centrifugal forces, lowers operating temperature, and extends bearing life, especially under high-speed conditions. This construction also provides enhanced resistance to electrical erosion.
- High-Speed Phenolic Cage: The lightweight and robust phenolic resin cage is integral to achieving the high limiting speed, providing excellent guidance and stability for the ceramic balls with minimal friction.
- Super-Precision P4A Tolerance: Manufactured to the tightest geometrical and dimensional tolerances, ensuring minimal runout and vibration for applications requiring extreme rotational accuracy.
- Optimized Load Capacity: The 25° contact angle provides an excellent balance between radial and axial load ratings (C = 1141 lbf, C0 = 878 lbf), making it suitable for combined loads.
- Universal Matching (SU): This bearing is designed for universal matching, allowing two bearings to be paired in a duplex set (DB, DF, DT) to share loads effectively and provide configurable system rigidity.
71908 ACBGA/HCP4AL Bearing Typical Application Areas
Due to its high-precision and high-speed capabilities, the 71908 ACBGA/HCP4AL is ideally suited for demanding applications in:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and spindle drives requiring high rigidity and accuracy.
- High-Frequency Motors and Spindles: Where ceramic balls reduce heat generation and allow for higher RPMs.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
- Medical Equipment: Dental handpieces and small, high-speed surgical tools.
