71805 ACD/P4DBB
71800 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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71805 ACD/P4DBB Bearing Product Overview & Core Advantages
The 71805 ACD/P4DBB is a precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This duplex back-to-back (DB) arrangement consists of two matched bearings, preloaded to deliver superior high rigidity and stability under complex loading conditions. It excels at simultaneously handling combined loads—significant radial and bidirectional axial loads—making it an ideal solution for high-speed, high-precision machinery where positional accuracy is critical.
71805 ACD/P4DBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71805 | Basic bearing designation (25mm bore, 37mm OD, 14mm width) |
| AC | Angular Contact design with a 25° contact angle |
| D | Duplex arrangement (two bearings supplied as a set) |
| DBB | Duplex Back-to-Back mounting configuration |
| P4 | High-Precision Tolerance Class (equivalent to ABEC 7) |
71805 ACD/P4DBB Bearing Structural Features & Performance Benefits
Optimized Duplex Design: The back-to-back arrangement creates a wide, rigid support system that effectively resists moment loads and shaft deflection, ensuring exceptional high rigidity and operational stability.
Superior Load Capacity: With a 25° contact angle and duplex configuration, this bearing is engineered to handle substantial combined loads, offering high radial and bidirectional axial load capacity.
High-Speed Capability: The phenolic resin cage provides excellent strength-to-weight ratio, reduced friction, and superior guidance at high rotational speeds, supporting the bearing's limiting speed of 85,000 rpm.
Precision Performance: Manufactured to P4 tolerance class with tight dimensional control on all bearing dimensions (bore, OD, width), ensuring minimal runout and vibration for precision applications.
Premium Material Construction: Chrome steel rings and balls provide high hardness, wear resistance, and long service life, while the phenolic cage offers reliable performance across the operating temperature range.
71805 ACD/P4DBB Bearing Typical Application Areas
- High-Speed Machine Tool Spindles for milling, grinding, and drilling operations
- Precision Medical Equipment including dental handpieces and surgical tools
- Aerospace Components requiring high-speed, high-precision rotation
- Industrial Pumps and Compressors where axial and radial loads are present
- Robotics and Automation Systems demanding high rigidity and accuracy
- Test and Measurement Equipment requiring minimal vibration and runout
