71902 ACD/P4ATBTA
71900 Series Super Precision Angular Contact Ball Bearings
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71902 ACD/P4ATBTA Bearing Product Overview & Core Advantages
The 71902 ACD/P4ATBTA is a metric precision angular contact ball bearing designed for the most demanding high-precision applications. This bearing is supplied as a triplex back-to-back (TBT) matched set with an extra light preload (Class A), delivering exceptional rotational accuracy and system rigidity. Its primary advantage lies in its ability to handle combined radial and axial loads simultaneously, making it ideal for high-speed spindles and precision machinery where minimal deflection and maximum stability are critical. Manufactured to the stringent P4A tolerance class, it ensures consistent, high-performance operation.
71902 ACD/P4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71902 | Basic bearing designation (15mm bore, 28mm OD) |
| AC | Angular Contact design with a 25° contact angle |
| D | Signifies a duplex bearing (a pair) |
| /P4A | Indicates P4A tolerance class for superior dimensional and running accuracy |
| TBT | Triplex Back-to-Back arrangement of three bearings |
| A | Specifies Extra Light Preload (Class A) for minimal friction and high-speed capability |
71902 ACD/P4ATBTA Bearing Structural Features & Performance Benefits
- High Rigidity & System Stability: The triplex back-to-back (TBT) matched set creates an extremely rigid bearing system that effectively resists moment loads and shaft deflection, which is crucial for maintaining precision in machine tool spindles.
- Optimized Load Capacity: The 25° contact angle is engineered to efficiently support significant combined loads, offering a balanced performance for both radial and axial forces.
- Superior High-Speed Performance: The lightweight phenolic cage reduces centrifugal forces, while the extra light preload minimizes friction and heat generation, enabling a high limiting speed of 95,000 rpm.
- Precision Engineering: Conformance to the P4A tolerance class guarantees tight control over bearing dimensions and runout, resulting in smooth, quiet, and accurate operation.
- Premium Materials: Components made from chrome steel provide high hardness, wear resistance, and a long operational life under demanding conditions.
71902 ACD/P4ATBTA Bearing Typical Application Areas
The 71902 ACD/P4ATBTA is specifically engineered for high-performance applications requiring utmost precision and speed, including:
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Robotics and Automation Arms
- Medical and Dental Drill Handpieces
- Aerospace Gyroscopes and Instrumentation
- High-RPM Electric Motors
