71808 ACD/P4
71800 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
- Fast delivery
- Free shipping on orders over $200
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71808 ACD/P4 Bearing Product Overview & Core Advantages
The 71808 ACD/P4 is a high-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This single-row bearing features a 25° contact angle and is supplied with a preload, making it ideally suited for managing combined loads where high axial and radial stiffness is critical. Its compact design, with a 7mm width, allows for space-saving configurations in high-speed machinery. Manufactured to a P4 (ABEC-7) tolerance class, it guarantees superior running accuracy and performance consistency for the most demanding precision applications.
71808 ACD/P4 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71808 | Basic bearing designation, indicating a metric, single-row angular contact ball bearing with a 40mm bore and 52mm outside diameter. |
| AC | Angular Contact design with a 25° contact angle. |
| D | Indicates a high-capacity internal design, often associated with a larger ball complement and optimized raceway geometry. |
| /P4 | Specifies the tolerance class P4 (ABEC-7), denoting very high precision in dimensions and running accuracy. |
71808 ACD/P4 Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The angular contact design with a 25° contact angle and preload ensures high system rigidity, effectively resisting combined (radial and axial) loads. The high-capacity "D" design, featuring 29 balls of 3.175mm diameter, provides excellent dynamic and static load ratings (1010 lbf / 1024 lbf).
High-Speed Performance: The lightweight phenolic cage minimizes centrifugal forces and friction, contributing to a high limiting speed of 34,000 rpm. The bearing is pre-lubricated for immediate operation and reduced startup wear.
Precision Engineering: Manufactured from chrome steel and held to P4 precision tolerances, this bearing guarantees minimal runout and vibration, which is critical for maintaining accuracy in high-speed spindles and precision instruments.
71808 ACD/P4 Bearing Typical Application Areas
The 71808 ACD/P4 is engineered for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed machining centers, grinding spindles.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- High-Frequency Motors and Spindles: For PCB drilling, dental handpieces, and small precision drives.
- Medical and Laboratory Equipment: Centrifuges, scanners, and other precision rotary devices.
