71813 ACD/P4DBB
71800 Series Super Precision Angular Contact Ball Bearings
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71813 ACD/P4DBB Bearing Product Overview & Core Advantages
The 71813 ACD/P4DBB is a super-precision angular contact ball bearing supplied as a duplex back-to-back (DB) matched set. Engineered to the exacting P4 tolerance class, this bearing is designed for applications demanding exceptional rotational accuracy, high rigidity, and reliable performance under combined loads. Its duplex DB arrangement provides excellent moment load capacity and axial rigidity, making it ideal for high-speed spindles and other precision machinery where positional stability is critical.
71813 ACD/P4DBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71813 | Basic bearing series and size designation |
| AC | Angular Contact design with a 25° contact angle |
| D | Duplex bearing (two single bearings mounted together) |
| P4 | High Precision Tolerance Class (super precision) |
| DBB | Duplex Back-to-Back arrangement |
71813 ACD/P4DBB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex back-to-back configuration creates a wide effective spread between load centers, significantly increasing the bearing's moment stiffness and ability to withstand combined radial and axial loads from both directions. This arrangement is essential for maintaining shaft positional accuracy under complex loading conditions.
Precision Performance: Manufactured to P4 tolerance class standards, this bearing ensures minimal runout and vibration, which is critical for achieving high surface finishes and machining accuracy. The light preload (Class B) eliminates internal clearance, providing consistent rotational characteristics from startup.
High-Speed Capability: The phenolic resin cage offers excellent strength-to-weight ratio, reduced centrifugal forces, and smooth operation at the limiting speed of 36,000 rpm. The open design and factory-applied lubrication facilitate efficient heat dissipation.
Material & Construction: Manufactured from chrome steel for both rings and balls, providing high hardness, wear resistance, and dimensional stability across the operating temperature range of -30°C to 110°C.
71813 ACD/P4DBB Bearing Typical Application Areas
The 71813 ACD/P4DBB is specifically engineered for high-performance applications requiring superior precision and rigidity:
- Machine Tool Spindles - High-speed milling, grinding, and turning centers
- Precision Rotary Tables - Indexing and positioning systems
- High-Frequency Spindles - PCB drilling and precision machining
- Industrial Robotics - Precision joints and rotary actuators
- Medical Equipment - High-speed dental handpieces and surgical tools
- Aerospace Systems - Gyroscopes and navigation instruments
