71918 CD/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
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71918 CD/P4ADBA Bearing Product Overview & Core Advantages
The 71918 CD/P4ADBA is a precision duplex angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. This matched back-to-back (DB) arrangement is preloaded to Extra Light / Class A specifications, ensuring minimal axial and radial runout for superior performance. Its primary advantage lies in its ability to handle combined loads (radial and axial) simultaneously with high stability, making it an ideal choice for high-speed, high-precision spindles and machinery where rigidity and positional accuracy are critical.
71918 CD/P4ADBA 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-speed applications with significant axial loads. |
| D | Duplex (two single bearings supplied as a matched set). |
| DB | Back-to-Back mounting arrangement, providing high moment rigidity. |
| P4A | High-Precision Tolerance Class (equivalent to ABEC 7), ensuring extremely tight dimensional and running accuracy. |
| A | Specific preload designation: Extra Light / Class A. |
71918 CD/P4ADBA Bearing Structural Features & Performance Benefits
Optimized Design for High-Speed Rigidity: The back-to-back duplex configuration creates a wide, stable support system that significantly increases moment load capacity and system rigidity, resisting tilting moments effectively. This is critical for maintaining precision under heavy combined loads.
Precision & High-Speed Capability: Manufactured to P4A tolerance class, this bearing guarantees minimal runout and vibration. The phenolic resin cage is lightweight and robust, contributing to lower centrifugal forces and enabling smooth operation at the high limiting speed of 15,000 rpm. The 15° contact angle provides an excellent balance between radial and axial load capacity for high-speed applications.
Superior Load Ratings: With a dynamic load rating of 17,122 lbf and a static load rating of 22,950 lbf, this bearing is engineered for long-lasting performance in demanding conditions. The use of high-grade chrome steel for rings and balls ensures durability and fatigue resistance.
71918 CD/P4ADBA Bearing Typical Application Areas
The 71918 CD/P4ADBA is engineered for the most demanding precision applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, high-frequency motor spindles.
- Robotics: High-accuracy robotic arm joints and rotary units.
- Medical Equipment: Dental handpieces, imaging device rotors.
- Aerospace & Defense: Gyroscopes, radar systems, and navigation instruments.
