71913 CD/P4ADBB
71900 Series Super Precision Angular Contact Ball Bearings
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71913 CD/P4ADBB Bearing Product Overview & Core Advantages
The 71913 CD/P4ADBB is a precision angular contact ball bearing designed for high-performance applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) matched pair configuration is preloaded to Light / Class B specifications, delivering superior system stiffness and minimizing axial and radial runout. Its primary advantage lies in its ability to handle combined loads—significant radial loads alongside thrust loads in both directions—making it ideal for high-speed, high-precision spindles and machinery where operational reliability is critical.
71913 CD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71913 | Basic bearing designation, indicating a high-precision angular contact bearing series with a 65 mm bore, 90 mm OD, and 26 mm width. |
| C | Designates a 15° contact angle, optimized for high-speed operation and moderate axial load capacity. |
| D | Indicates the bearing is part of a duplex pair. |
| P4A | Specifies an ultra-high precision tolerance class (superior to ABEC 7), ensuring minimal running noise and vibration for demanding applications. |
| DB | Denotes the Duplex Back-to-Back mounting arrangement, which provides high moment rigidity and excellent stability under complex loading conditions. |
71913 CD/P4ADBB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and shaft deflection, crucial for maintaining precision under heavy combined loads.
- Superior Precision: Manufactured to P4A tolerance class with extremely tight dimensional tolerances on the bore, outside diameter, and width, this bearing ensures smooth, accurate rotation with minimal runout.
- Optimized High-Speed Performance: The 15° contact angle and phenolic resin cage reduce friction and centrifugal forces, enabling a high limiting speed of 31,000 rpm. The cage is lightweight and possesses excellent sliding properties, which is vital for high-speed bearing applications.
- Premium Material Construction: Made from high-grade chrome steel for both rings and balls, the bearing offers high fatigue life and durability. It comes pre-lubricated for immediate operation within a temperature range of -30°C to 110°C.
71913 CD/P4ADBB Bearing Typical Application Areas
The 71913 CD/P4ADBB is engineered for the most demanding high-precision, high-speed machinery. Its primary applications include:
- Machine Tool Spindles: CNC machining centers, grinding spindles, and milling spindles requiring extreme accuracy and rigidity.
- Precision Drives: High-frequency motors and spindles.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and other critical navigation and control systems.
- Medical Equipment: High-speed dental handpieces and laboratory instrumentation.
