71908 CD/HCP4ADT
Hybrid Ceramic Super Precision Bearings
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71908 CD/HCP4ADT Bearing Product Overview & Core Advantages
The 71908 CD/HCP4ADT is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This duplex tandem (DT) arrangement combines two bearings preloaded against each other, delivering superior axial rigidity and the ability to handle significant combined loads. Manufactured to a P4A tolerance class and featuring a phenolic cage with ceramic balls, it is engineered for high-speed operation and long service life in precision machinery.
71908 CD/HCP4ADT Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Technical Meaning |
|---|---|
| 71908 | Basic bearing designation indicating a metric, angular contact type with a 40mm bore, 62mm OD, and 24mm width. |
| C | Specifies a 15° contact angle, optimized for high-speed applications with a high axial load component. |
| D | Indicates the bearing is part of a duplex tandem (DT) matched set. |
| HC | Signifies the use of Hybrid Ceramic components (ceramic balls with steel rings). |
| P4A | Denotes an extremely high precision tolerance class, exceeding ABEC 7/ISO P4 standards for running accuracy. |
71908 CD/HCP4ADT Bearing Structural Features & Performance Benefits
Duplex Tandem Design & High Rigidity: The two bearings are mounted in a tandem arrangement and preloaded, resulting in a very stiff bearing system capable of resisting significant axial deflection under load.
Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls reduces weight, minimizes centrifugal forces, and allows for lower operating temperatures, directly contributing to the high limiting speed of 56,000 rpm.
Precision & Load Capacity: Built to P4A tolerance for exceptional running accuracy. The design provides a high dynamic and static load rating (4478 lbf / 3825 lbf), making it suitable for applications with combined radial and axial loads.
High-Speed Phenolic Cage: The phenolic resin cage offers excellent performance at high speeds due to its light weight and favorable sliding properties, further enhancing the bearing's high-speed capabilities.
71908 CD/HCP4ADT Bearing Typical Application Areas
This high-precision, high-speed bearing is ideally suited for the most demanding positions in:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing equipment.
- High-Frequency Motors and Turbochargers.
- Advanced Robotics and Aerospace Actuators.
