71902 ACEGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71902 ACEGA/P4A Bearing Product Overview & Core Advantages
The 71902 ACEGA/P4A is a single row angular contact ball bearing designed for high-precision applications requiring exceptional rotational accuracy. Positioned in the P4A super-precision tolerance class, it delivers superior running accuracy and dimensional stability. Its key advantage lies in its ability to efficiently handle combined loads (simultaneous radial and axial loads) due to its 25° contact angle. The bearing is pre-lubricated and features a lightweight phenolic cage, making it an ideal choice for high-speed spindles and other demanding machinery where minimal vibration and high rigidity are critical.
71902 ACEGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71902 | Basic bearing series and size designation (15mm bore, 28mm OD, 7mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| E | Optimized internal design for high-speed operation and improved load capacity. |
| GA | Indicates a universally matchable bearing. When two such bearings are mounted in a matched set (face-to-face or back-to-back), they achieve a specific preload (in this case, Extra Light / Class A). |
| P4A | Denotes a super-precision tolerance class, exceeding ABEC 7 standards, ensuring extremely tight dimensional and running accuracy. |
71902 ACEGA/P4A Bearing Structural Features & Performance Benefits
- High-Speed Capability: The combination of the phenolic resin cage (lightweight and robust) and the optimized internal "E" design enables a high limiting speed of 230,000 rpm (with oil lubrication), making it a premier high-speed bearing.
- Precision and Rigidity: Manufactured to P4A tolerance class with extremely tight bore, outside diameter, and width tolerances. This ensures minimal runout and superior system stiffness for applications requiring the highest levels of accuracy.
- Combined Load Support: The 25° contact angle is engineered to support significant axial loads in one direction in addition to radial loads, making it highly effective for combined load conditions.
- Universal Matching & Preload: The GA suffix signifies that bearings are universally matchable. This allows for simplified assembly of preloaded pairs (typically two bearings), providing immediate high rigidity and precise axial positioning without the need for complex adjustments.
- Material Integrity: Constructed from high-grade chrome steel for both rings and balls, ensuring high durability, wear resistance, and a long operational life under demanding conditions.
71902 ACEGA/P4A Bearing Typical Application Areas
The 71902 ACEGA/P4A is specified for high-performance machinery where precision and speed are non-negotiable. Key sectors include:
- Machine Tool Spindles: High-frequency milling, grinding, and turning centers.
- Precision Drives: High-speed motors and spindles in PCB drilling and semiconductor manufacturing equipment.
- Aerospace & Defense: Gyroscopes, navigation systems, and other critical instrumentation.
- Medical Equipment: Dental handpieces and small high-speed surgical tools.
