71902 ACDGC/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71902 ACDGC/P4A Bearing Product Overview & Core Advantages
The 71902 ACDGC/P4A is a high-precision angular contact ball bearing designed for applications demanding exceptional accuracy and rigidity. As a single bearing with a 25° contact angle and Moderate (Class C) preload, it is engineered to support combined loads—handling significant radial loads alongside thrust loads in one direction. Its P4A tolerance class ensures ultra-precise running accuracy, making it ideal for high-speed spindles and other precision machinery where minimal runout and high system rigidity are critical. The phenolic cage and universal matching (SU) capability further enhance its performance in demanding, high-limiting speed applications.
Model Code Deep Explanation
| Code Segment | Technical Meaning |
|---|---|
| 71902 | Basic bearing series and size designation (15mm bore, 28mm OD, 7mm width). |
| AC | Angular Contact design, optimized for combined loads. |
| D | High Contact Angle of 25° for superior thrust load capacity. |
| GC | Specific internal clearance and preload group: Moderate Preload / Class C. |
| P4A | Tolerance Class denoting very high running accuracy, tighter than ABEC 7. |
71902 ACDGC/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The 25° contact angle and Class C preload provide high system stiffness, enabling the bearing to effectively support combined radial and axial loads. The optimized internal geometry maximizes the dynamic load rating within a compact bearing size.
- Superior High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, contributing to a high limiting speed of 95,000 rpm. This makes it an excellent high-speed bearing for spindle applications.
- Precision Engineering: Manufactured to P4A tolerance class, this bearing guarantees extremely tight dimensional and running accuracy, resulting in smooth operation, reduced vibration, and enhanced machine tool performance.
- Universal Matchability (SU): The bearing is universally matchable, allowing for simplified mounting in sets (typically 3 bearings) to create a pre-loaded arrangement without the need for selective assembly, saving time and cost.
71902 ACDGC/P4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and CNC lathes.
- Precision Instruments: High-accuracy measuring devices and optical equipment.
- High-Speed Drives: Small electric motor spindles and turbochargers.
- Robotics: High-precision joints and arm assemblies requiring rigidity and accuracy.
