71801 ACD/P4DBB
71800 Series Super Precision Angular Contact Ball Bearings
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71801 ACD/P4DBB Bearing Product Overview & Core Advantages
The 71801 ACD/P4DBB is a precision duplex pair of angular contact ball bearings in a Back-to-Back (DB) arrangement. This configuration is specifically engineered to provide exceptional high rigidity and stability, making it ideal for applications requiring high precision and reliability. The bearings are preloaded (Light / Class B) and manufactured to a P4 tolerance class, ensuring superior running accuracy. Their design is optimized to handle combined loads—significant radial loads and axial loads in both directions—simultaneously, offering a compact and highly effective solution for demanding machinery.
71801 ACD/P4DBB Bearing Model Code Explained, Specifications & Naming Convention
- 71801: Basic bearing series and size designation (12mm bore, 21mm OD).
- ACD: Angular Contact Duplex. Indicates the bearings are supplied as a universal matching duplex set.
- P4: Tolerance Class. Denotes a very high level of dimensional and running accuracy superior to ABEC-7.
- DB: Duplex Back-to-Back arrangement. This mounting configuration increases moment rigidity and provides high resistance to overturning moments.
Key Configuration: The combination of P4 precision and the preloaded DB arrangement is critical for applications demanding extreme rotational accuracy and stiffness.
71801 ACD/P4DBB Bearing Structural Features & Performance Benefits
High Rigidity & Stability: The Back-to-Back (DB) duplex arrangement creates a wide, stable support system that significantly increases moment load capacity and system rigidity, minimizing deflection under load.
Precision Performance: Manufactured to a P4 tolerance class with a 25° contact angle, these bearings deliver exceptionally low runout and smooth, precise rotation essential for high-speed spindles.
Optimized Internal Design: The phenolic resin cage is lightweight and robust, contributing to smooth operation at high speeds and reduced friction. With 14 high-precision chrome steel balls, the bearing achieves an excellent balance between load capacity and speed capability.
Load Handling: This set is designed to accommodate combined radial and bidirectional axial loads effectively. The preload ensures consistent performance and eliminates internal clearance.
71801 ACD/P4DBB Bearing Typical Application Areas
The 71801 ACD/P4DBB is specifically designed for high-precision, high-rigidity applications, including:
- Machine Tool Spindles (especially for high-speed milling and grinding)
- Precision Grinding Spindles
- High-Frequency Motors
- Medical and Dental Handpiece Drives
- High-Precision Robotics and Automation Equipment
