71819 ACD/P4
71800 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
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71819 ACD/P4 Bearing Product Overview & Core Advantages
The 71819 ACD/P4 is a single-row angular contact ball bearing designed for applications demanding high precision and superior performance. Its defining feature is the 25° contact angle, which enables it to support significant combined loads—handling both radial and axial forces simultaneously with high efficiency. Manufactured to the exacting P4 (ABEC-7) tolerance class, this bearing ensures exceptional running accuracy and rotational stability. Its compact cross-section and optimized internal geometry make it an ideal choice for high-speed spindles and other precision machinery where space is limited and performance is critical.
71819 ACD/P4 Bearing Model Code Explained, Specifications & Naming Convention
The model number 71819 ACD/P4 provides detailed technical specifications. Below is a breakdown of its key components:
| Code Segment | Technical Meaning |
|---|---|
| 71819 | The basic bearing designation, indicating the series and bearing dimensions (95mm bore, 120mm OD, 13mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Indicates a high load capacity internal design. |
| /P4 | Specifies the P4 tolerance class (equivalent to ABEC-7), denoting a precision bearing with extremely tight dimensional and running accuracy tolerances. |
71819 ACD/P4 Bearing Structural Features & Performance Benefits
The performance of the 71819 ACD/P4 is a direct result of its advanced construction:
- High Rigidity and Load Capacity: The optimized 25° contact angle and robust internal geometry provide excellent resistance to combined loads. The use of 32 high-grade chrome steel balls ensures a high dynamic and static load rating (4680 lbf / 5738 lbf).
- High-Speed Capability: The lightweight and durable phenolic resin cage minimizes centrifugal forces and friction, contributing to a high limiting speed of 14,000 rpm. This makes it a true high-speed bearing.
- Precision and Stability: As a P4 precision bearing, it features ultra-tight tolerances on bore, outside diameter, and width, ensuring minimal runout and vibration for smooth, accurate operation.
- Optimized for Preload: The bearing is designed to be used with a preload, which eliminates internal clearance and increases system stiffness and natural frequency, which is critical for machining accuracy.
71819 ACD/P4 Bearing Typical Application Areas
The 71819 ACD/P4 is engineered for high-performance applications where precision and speed are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and rotary actuators requiring high rigidity and accuracy.
- Aerospace & Defense Systems: Gyroscopes, radar equipment, and auxiliary power units.
- High-Frequency Motors and Spindles: Used in PCB drilling, semiconductor manufacturing, and dental handpieces.
