71908 CBGA/HCP4A
Hybrid Ceramic Super Precision 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 CBGA/HCP4A is a high-precision angular contact ball bearing designed for applications demanding exceptional accuracy and performance. As a single bearing with an extra light preload (Class A), it offers superior rotational precision and rigidity. Its key advantage lies in its ability to handle combined loads—simultaneously supporting significant radial loads and axial loads in one direction. The use of ceramic balls and a phenolic cage contributes to its high-speed capability, low friction, and extended service life, making it an ideal choice for high-reliability, high-speed machinery.
71908 CBGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 71908 CBGA/HCP4A provides detailed technical specifications. Below is a breakdown of its key components:
- 71908: Basic bearing series and size designation (40mm bore, 62mm OD, 12mm width).
- C: Represents a 15° contact angle, optimized for high-speed applications and axial load capacity.
- B: Indicates the geometry and internal design are optimized for high precision and performance.
- GA: Signifies that the bearing is supplied lubricated with grease.
- HCP4A: Denotes a Universal Matchable (SU) bearing from a set of 2, manufactured to P4A tolerance class for exceptional dimensional and running accuracy.
Structural Features and Performance Benefits
The 71908 CBGA/HCP4A incorporates several advanced features that deliver distinct performance benefits:
- High-Speed Performance: The combination of ceramic balls (lower density, reduced centrifugal forces) and a lightweight phenolic resin cage enables a very high limiting speed of 41,000 rpm, minimizing heat generation and power loss.
- High Rigidity and Precision: Manufactured to P4A tolerance class with an extra light preload, this bearing provides maximum shaft rigidity and minimal runout, which is critical for applications requiring extreme positional accuracy.
- Superior Load Capacity: The 15° contact angle and robust chrome steel rings are engineered to handle high dynamic and static radial loads (1215 lbf and 934 lbf respectively), as well as substantial axial loads.
- Universal Matching: As an HCP4A Universal Matchable (SU) bearing, it can be universally paired with another bearing from the same set without selective matching, simplifying installation and ensuring optimal preload and performance in duplex arrangements.
71908 CBGA/HCP4A Bearing Typical Application Areas
This high-precision, high-speed bearing is ideally suited for demanding applications across various industries, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and spindle drives requiring high accuracy and rigidity.
- High-Frequency Motors and Spindles: Where minimal friction and maximum speed are paramount.
- Medical and Dental Equipment: High-speed handpieces and diagnostic scanners.
- Aerospace and Defense Systems: Gyroscopes, navigation instruments, and auxiliary power units.
