71913 ACD/P4ADBD
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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Product Overview and Core Advantages
The 71913 ACD/P4ADBD is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This duplex back-to-back (DB) arrangement bearing set is preloaded to Heavy / Class D specifications, delivering superior stiffness and rotational accuracy. It is engineered to handle significant combined loads (radial and axial) simultaneously, making it ideal for high-precision machinery where minimal deflection under load is critical. Manufactured to the exacting P4A tolerance class, this bearing ensures reliable performance in high-speed and high-rigidity applications.
71913 ACD/P4ADBD Bearing Model Code Explained, Specifications & Naming Convention
- 71913: Basic bearing series and size designation (65mm bore, 90mm OD, 26mm width)
- AC: Angular Contact design with a 25° contact angle
- D: Duplex configuration (two bearings supplied as a set)
- P4A: High Precision Tolerance Class, exceeding standard ABEC-7/ISO P4 specifications
- DB: Back-to-Back mounting arrangement, optimized for moment load resistance
- Heavy Preload (Class D): Delivers maximum system rigidity and precise shaft positioning
Structural Features and Performance Benefits
High Rigidity and Stability: The duplex back-to-back (DB) arrangement with heavy preload creates an extremely rigid bearing system that effectively resists moment loads and minimizes axial and radial play, ensuring precise shaft positioning even under heavy combined loads.
Superior Load Capacity: With a 25° contact angle and optimized internal geometry, this bearing efficiently handles substantial radial loads and bidirectional axial loads simultaneously. The dynamic load rating of 7178 lbf and static load rating of 7200 lbf demonstrate its robust load-carrying capability.
Precision Performance: Manufactured to P4A tolerance class with tight dimensional controls (bore and OD tolerance: -0.004mm to 0), this bearing ensures minimal runout and vibration for smooth, accurate operation in precision applications.
High-Speed Capability: The phenolic cage provides excellent strength-to-weight ratio and smooth operation at the limiting speed of 36,000 rpm, while the chrome steel construction maintains dimensional stability under high rotational stresses.
71913 ACD/P4ADBD Bearing Typical Application Areas
The 71913 ACD/P4ADBD is specifically engineered for high-performance applications including:
- Machine Tool Spindles - Providing the rigidity and precision required for high-speed machining centers
- Precision Grinding Spindles - Ensuring minimal deflection and vibration in demanding grinding operations
- High-Speed Industrial Pumps - Handling combined radial and axial loads in pump applications
- Aerospace Positioning Systems - Delivering accurate positioning and high rigidity in aerospace components
- Robotic Arm Joints - Offering precise motion control and load capacity in automation equipment
