71905 ACD/P4AQBCC
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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71905 ACD/P4AQBCC Bearing Product Overview & Core Advantages
The 71905 ACD/P4AQBCC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. As part of a Quadruplex Back-to-Back (QBC) matched set, this bearing is engineered to handle combined loads with high stability. Its P4A tolerance class ensures superior running accuracy, making it ideal for high-speed spindles and precision machinery where high rigidity and reliable performance under complex loading conditions are paramount.
71905 ACD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71905 | Bearing series and size designation (5mm bore? Check specification: 25mm bore) |
| ACD | Angular Contact, 25° contact angle design |
| P4A | High Precision Tolerance Class (superior to ABEC 7) |
| QBCC | Quadruplex Back-to-Back matched set with Moderate Preload (Class C) |
71905 ACD/P4AQBCC Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The Quadruplex Back-to-Back (QBC) arrangement provides exceptional system stiffness, enabling the bearing to withstand significant combined radial and axial loads. The 25° contact angle is optimized for sustaining substantial thrust loads.
Precision Performance: Manufactured to P4A tolerance class, this bearing guarantees minimal runout and vibration, which is critical for maintaining accuracy in high-speed applications. The tight dimensional tolerances on the bore diameter and outside diameter ensure precise fit and consistent performance.
High-Speed Capability: The phenolic cage offers low weight and excellent performance at high rotational speeds, contributing to the bearing's limiting speed of 53,000 rpm. This makes it suitable for high-speed spindle applications.
Material & Lubrication: Constructed from chrome steel for both rings and balls, the bearing provides high durability and fatigue resistance. It comes pre-lubricated for immediate use within its specified temperature range.
71905 ACD/P4AQBCC Bearing Typical Application Areas
- Machine Tool Spindles: High-speed machining centers, grinding spindles.
- Precision Rotary Systems: CNC rotary tables, indexing heads.
- High-Speed Drives: Electric motor spindles, turbocharger shafts.
- Medical Equipment: High-speed dental handpieces, laboratory centrifuges.
- Aerospace Systems: Gyroscopes, navigation instrument rotors.
