71909 CD/P4AQBCC
71900 Series Super Precision Angular Contact Ball Bearings
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71909 CD/P4AQBCC Bearing Product Overview & Core Advantages
The 71909 CD/P4AQBCC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This metric quadruplex back-to-back (QBC) matched set delivers superior performance under combined loads, handling significant radial and axial forces simultaneously. Manufactured to the exacting P4A tolerance class and featuring a moderate preload (Class C), it ensures minimal runout and stable operation in high-precision machinery. Its compact design, combined with a high load capacity, makes it an ideal choice for high-reliability systems.
71909 CD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71909 | Basic bearing series and size designation (45mm bore, 68mm OD, 48mm width) |
| CD | Contact angle of 15°, optimized for combined radial and axial loads |
| P4A | High precision tolerance class (superior to ABEC-7), ensuring minimal dimensional variation and runout |
| QBCC | Specifies a Quadruplex Back-to-Back (QBC) matched set of 4 bearings with moderate preload (Class C) applied |
71909 CD/P4AQBCC Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The quadruplex back-to-back arrangement creates an exceptionally rigid bearing system, capable of withstanding heavy combined loads and moments. The 15° contact angle is optimized for supporting significant axial loads in both directions alongside radial loads.
Precision & Speed Performance: Manufactured to P4A tolerance standards, this bearing guarantees high rotational accuracy and smooth operation. The phenolic cage contributes to lower friction and allows for a high limiting speed of 41,000 rpm, making it suitable for high-speed applications.
Optimized Material & Design: Constructed from chrome steel for both rings and balls, it offers high durability and fatigue resistance. The set is pre-lubricated for immediate use and reliable operation within a specified temperature range.
71909 CD/P4AQBCC Bearing Typical Application Areas
This high-precision, high-rigidity bearing set is engineered for advanced applications, including:
- Machine Tool Spindles (High-speed milling, grinding)
- Precision Gearboxes
- Industrial Robotics (High-accuracy rotary joints and arms)
- Aerospace Actuation Systems
- Medical & Laboratory Equipment (Centrifuges, high-speed scanners)
