71818 ACD/P4DBA
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
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71818 ACD/P4DBA Bearing Product Overview & Core Advantages
The 71818 ACD/P4DBA is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This matched pair arrangement in a back-to-back (DB) configuration provides superior stability when handling combined loads (radial and axial) from both directions. Manufactured to P4 tolerance class, it ensures minimal runout and vibration, making it ideal for high-precision, high-speed machinery. The preloaded extra light (Class A) design eliminates internal clearance, delivering immediate responsiveness and enhanced system stiffness.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71818 | Basic bearing series and size designation (90mm bore, 115mm OD) |
| AC | Angular Contact design with a 25° contact angle |
| D | Duplex (two bearings) configuration |
| P4 | High precision tolerance class for exceptional running accuracy |
| DB | Back-to-Back mounting arrangement for high rigidity and moment load capacity |
| A | Extra light preload for minimal friction and high-speed capability |
71818 ACD/P4DBA Bearing Structural Features & Performance Benefits
Optimized Internal Geometry: The 25° contact angle is engineered to efficiently support significant axial loads in both directions while maintaining excellent radial load capacity. With 31 precision balls and a phenolic cage, this bearing achieves smooth operation at high speeds (up to 15,000 rpm) with reduced friction and heat generation.
Enhanced Rigidity & Accuracy: The duplex back-to-back arrangement creates a rigid bearing system that effectively resists moment loads and shaft deflection. Manufactured to P4 precision tolerances with tight dimensional controls on bore, OD, and width, it ensures precise shaft positioning and minimal vibration.
Superior Material Construction: Both rings and balls are manufactured from chrome steel for high fatigue resistance and durability. The open design allows for customized lubrication schemes to optimize performance for specific operating conditions within the temperature range of -30°C to 110°C.
71818 ACD/P4DBA Bearing Typical Application Areas
- Machine Tool Spindles: High-precision milling, grinding, and turning centers requiring exceptional rigidity and accuracy
- Precision Gearboxes: Industrial transmission systems where minimal backlash and high positional accuracy are critical
- High-Speed Machining Centers: Applications demanding stable performance at elevated rotational speeds
- Robotic Arm Joints
