71907 ACD/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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71907 ACD/P4A Bearing Product Overview & Core Advantages
The 71907 ACD/P4A is a single-row angular contact ball bearing designed for high-precision applications requiring exceptional rotational accuracy and rigidity. Engineered to P4 (ABEC-7) tolerance class, it delivers superior running accuracy and is preloaded for optimal stiffness and minimal axial/radial play. Its primary function is to support combined loads, efficiently carrying both radial and significant axial loads in one direction. The 25° contact angle is optimized for high axial load capacity, making it ideal for compact, high-performance arrangements. It comes pre-lubricated for immediate operation and features a lightweight phenolic cage for high-speed capability.
71907 ACD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71907 | Basic bearing series and size designation (35mm bore, 55mm OD, 10mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Signifies a high-precision, preloaded bearing pair or set. |
| /P4A | Denotes P4 (ABEC-7) tolerance class and specific preload level (A). |
71907 ACD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: The P4 tolerance class and factory-applied preload eliminate internal clearance, resulting in exceptional system stiffness and precise shaft positioning, critical for minimizing deflection under load.
- Superior Load Capacity: The 25° contact angle and optimized internal geometry provide a high thrust load capacity in one direction while maintaining significant radial load capacity, making it suitable for combined loads.
- High-Speed Performance: The lightweight, robust phenolic resin cage ensures stable operation and reduced centrifugal forces, contributing to a high limiting speed of 36,000 rpm.
- Optimized Material & Lubrication: Manufactured from chrome steel for both rings and balls, ensuring high durability and fatigue life. The bearing is pre-lubricated for immediate startup and reliable operation within its specified temperature range.
71907 ACD/P4A Bearing Typical Application Areas
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Gearboxes: Especially in high-performance automotive and industrial applications.
- High-Frequency Spindles: Used in PCB drilling and routing equipment.
- Robotic Arms and Actuators: Providing high rigidity and accuracy in joint movements.
