71801 ACD/P4QBCB
71800 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
Ball & Washer Dimensions
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71801 ACD/P4QBCB Bearing Product Overview & Core Advantages
The 71801 ACD/P4QBCB is a high-precision quadruplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This metric system bearing features a back-to-back matched arrangement (QBC) of four bearings, enabling it to withstand combined radial and axial loads simultaneously. Manufactured to P4 tolerance class, it delivers superior running accuracy and is preloaded to Light / Class B for optimal performance in high-speed, high-rigidity scenarios. Its compact design and phenolic cage contribute to its suitability for precision machinery.
71801 ACD/P4QBCB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
| 71801 | Basic bearing designation with 12mm bore, 21mm OD |
| ACD | Angular Contact design with 25° contact angle |
| P4 | High-precision tolerance class for superior running accuracy |
| QBCB | Quadruplex Back-to-Back matched set arrangement |
71801 ACD/P4QBCB Bearing Structural Features & Performance Benefits
Exceptional Rigidity: The quadruplex back-to-back arrangement creates an extremely rigid bearing system that minimizes deflection under load, making it ideal for applications requiring high positional accuracy.
Superior Load Capacity: With a radial dynamic load rating of 1170 lbf and radial static load rating of 1012 lbf, this bearing effectively handles combined loads while maintaining performance.
High-Speed Capability: The phenolic cage material and optimized design enable a limiting speed of 100,000 rpm, suitable for high-speed spindle applications.
Precision Engineering: Manufactured to P4 tolerance class with tight dimensional tolerances (bore: -0.004mm to 0, OD: -0.004mm to 0) ensures consistent, high-precision performance.
Thermal Stability: The phenolic cage provides excellent dimensional stability across the operating temperature range of -30°C to 110°C.
71801 ACD/P4QBCB Bearing Typical Application Areas
- High-speed machine tool spindles requiring extreme precision and rigidity
- Precision grinding machine spindles and rotary tables
- Industrial robotics and automation equipment
- Medical device manufacturing equipment
- Aerospace instrumentation and control systems
- Semiconductor manufacturing equipment requiring high accuracy
