71917 CD/P4ADBB
71900 Series Super Precision Angular Contact Ball Bearings
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71917 CD/P4ADBB Bearing Product Overview & Core Advantages
The 71917 CD/P4ADBB is a precision duplex angular contact ball bearing designed for applications requiring exceptional rotational accuracy and rigidity. This back-to-back (DB) matched pair is preloaded to Light / Class B specifications, ensuring optimal stiffness and minimal axial/radial runout. Its primary advantage lies in its ability to handle combined loads—significant radial and axial loads from both directions simultaneously—making it ideal for high-precision, high-rigidity spindles and systems where positioning accuracy is critical.
71917 CD/P4ADBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71917 | Basic bearing designation (85mm bore, 120mm OD, 36mm width) |
| C | 15° contact angle |
| D | Duplex back-to-back (DB) arrangement |
| P4A | High precision tolerance class (exceeds ABEC-7) |
| DBB | Universal match bearing (preloaded and ready to mount) |
71917 CD/P4ADBB Bearing Structural Features & Performance Benefits
High Rigidity & Precision: The duplex back-to-back configuration creates a wide, rigid support system that effectively resists moment loads. Combined with the P4A tolerance class and light preload, this ensures exceptional running accuracy and system stability.
Superior Load Capacity: With a 15° contact angle and optimized internal geometry, this bearing pair delivers excellent performance under combined radial and axial loads. The dynamic load rating of 17,122 lbf and static load rating of 21,712 lbf enable reliable operation in demanding applications.
High-Speed Capability: The phenolic resin cage provides excellent guidance for the 25 precision balls while maintaining low friction and minimal centrifugal forces, contributing to the high limiting speed of 17,000 rpm.
Precision Components: Manufactured from chrome steel for both rings and balls, the bearing ensures consistent performance and long service life. The standard lubrication is suitable for the specified temperature range of -30°C to 110°C.
71917 CD/P4ADBB Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers requiring extreme precision
- Precision Rotary Tables: Indexing and positioning systems in manufacturing equipment
- High-Frequency Spindles: PCB drilling and precision machining applications
- Medical Equipment: Dental handpieces and surgical tool rotors
- Test & Measurement Equipment: Precision instruments requiring minimal runout and high rigidity
