71907 ACD/P4ADBC
71900 Series Super Precision Angular Contact Ball Bearings
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71907 ACD/P4ADBC Bearing Product Overview & Core Advantages
The 71907 ACD/P4ADBC is a precision angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) matched pair is preloaded to Moderate / Class C standards, delivering superior system stiffness and precise shaft positioning. Engineered to handle combined loads (radial and axial), it is ideal for high-speed, high-precision machinery where uncompromising performance is critical. The bearing is pre-lubricated and features an open design for controlled lubrication management.
71907 ACD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
- 71907: Basic designation for a high-precision angular contact ball bearing series with a 35 mm bore, 55 mm OD, and 20 mm width.
- AC: Angular Contact design with a 25° contact angle.
- D: Indicates a Duplex (two-bearing) set.
- P4A: Denotes a high-precision tolerance class (superior to ABEC 7), ensuring minimal runout and vibration.
- DB: Specifies the Back-to-Back mounting arrangement, which provides high moment rigidity.
- C: Indicates a Moderate preload for optimal balance between stiffness and speed capability.
71907 ACD/P4ADBC Bearing Structural Features & Performance Benefits
High Rigidity & System Stability: The duplex back-to-back (DB) arrangement creates a wide effective spread, significantly increasing the bearing system's resistance to moment loads and enhancing operational stability.
Superior Precision: Manufactured to P4A tolerance class, this bearing ensures extremely tight dimensional and running accuracy, which is essential for applications like machine tool spindles.
Optimized High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces, reduces friction, and allows for higher limiting speeds (up to 56,000 rpm). The 25° contact angle is well-suited for high-speed applications with significant axial loads.
Robust Load Capacity: With a dynamic load rating of 3330 lbf and a static load rating of 2812 lbf, the bearing reliably handles demanding combined radial and axial loads.
Durable Construction: Components made from chrome steel provide excellent wear resistance and long service life under demanding conditions.
71907 ACD/P4ADBC Bearing Typical Application Areas
The 71907 ACD/P4ADBC is engineered for high-performance applications, including:
- Machine Tool Spindles: For milling, grinding, and turning centers requiring high precision and rigidity.
- High-Speed Machining Centers: Where superior rotational accuracy and speed are paramount.
- Precision Grinding Spindles: Demanding minimal runout and vibration.
- Industrial Pumps and Compressors: For applications with high axial and radial load requirements.
- Robotic Arm Joints and Precision Gearboxes: Where compact, high-stiffness bearing solutions are critical.
