71918 CD/P4ADBC
71900 Series Super Precision Angular Contact Ball Bearings
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71918 CD/P4ADBC Bearing Product Overview & Core Advantages
The 71918 CD/P4ADBC is a precision duplex angular contact ball bearing designed for applications demanding exceptional rigidity and accuracy. This matched back-to-back (DB) arrangement is preloaded to Moderate (Class C) specifications, providing superior system stiffness and rotational precision. Its primary advantage lies in its ability to handle combined loads—significant radial and axial loads from both directions simultaneously—making it an ideal choice for high-precision, high-rigidity spindles and machinery.
71918 CD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71918 | Bearing series and size designation (90mm bore, 125mm OD, 36mm width) |
| C | 15° contact angle, optimized for high axial load capacity |
| D | Duplex (two single bearings as a set) |
| P4A | High precision tolerance class (superior to ABEC 7), ensuring minimal runout and vibration |
| DB | Back-to-Back arrangement, providing high moment rigidity and stability |
71918 CD/P4ADBC Bearing Structural Features & Performance Benefits
High Rigidity & System Stability: The duplex back-to-back (DB) configuration creates a wide, rigid support system that effectively resists moment loads and shaft deflection, which is critical for maintaining accuracy under heavy cutting forces.
Superior Load Capacity: With a 15° contact angle and a dynamic load rating of 17,122 lbf, this bearing is engineered to handle demanding combined radial and axial loads in both directions, a hallmark of angular contact design.
Precision & High-Speed Operation: The P4A tolerance class guarantees tight dimensional control for smooth, precise rotation. The lightweight phenolic cage and optimized internal geometry contribute to a high limiting speed of 15,000 rpm, suitable for high-speed spindle applications.
Optimized for Performance: The bearings are pre-lubricated and feature an open seal type, allowing for optimal lubrication management in controlled environments to achieve maximum speed and service life.
71918 CD/P4ADBC Bearing Typical Application Areas
The 71918 CD/P4ADBC is specified for high-performance machinery where precision and rigidity are non-negotiable. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Grinding Spindles: Applications requiring extreme rotational accuracy and minimal runout.
- High-Frequency Motor Spindles: Where high rotational speeds and dynamic stability are paramount.
- Industrial Pumps & Compressors: For shafts subjected to significant axial and radial forces.
