71918 CD/P4AQBCD
71900 Series Super Precision Angular Contact Ball Bearings
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71918 CD/P4AQBCD Bearing Product Overview & Core Advantages
The 71918 CD/P4AQBCD is a precision quadruplex angular contact ball bearing designed for applications demanding extreme rigidity and high load capacity. This metric system bearing features a heavy preload (Class D) and a back-to-back quadruplex (QBC) matched arrangement, enabling it to handle significant combined loads (radial and axial) simultaneously while maintaining exceptional rotational accuracy. Its compact design and P4A tolerance class make it ideal for high-precision, high-reliability machinery where uncompromising performance is critical.
71918 CD/P4AQBCD Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71918 | Basic bearing series, indicating a high-precision angular contact design with a 90mm bore, 125mm OD, and 72mm width. |
| CD | Specifies a 15° contact angle, optimized for high axial load capacity and high-speed operation. |
| P4A | Indicates a high-precision tolerance class with enhanced running accuracy requirements. |
| QBC | Denotes a Quadruplex Back-to-Back matched set of four bearings, providing maximum system rigidity. |
| D | Specifies a Heavy Preload class, ensuring minimal deflection under load for superior stiffness. |
71918 CD/P4AQBCD Bearing Structural Features & Performance Benefits
Unmatched Rigidity and Load Capacity: The quadruplex back-to-back (QBC) arrangement creates an exceptionally rigid bearing system, effectively resisting complex moment loads. With a radial dynamic load rating of 28,125 lbf and a static load rating of 45,900 lbf, it is engineered for heavy-duty applications. The 15° contact angle provides an excellent balance for handling substantial axial loads.
Precision and High-Speed Capability: Manufactured to P4A tolerance class with a phenolic cage, this bearing ensures smooth operation and low vibration at high rotational speeds, with a limiting speed of 15,000 rpm. The phenolic cage offers low weight and excellent performance under high centrifugal forces.
Durability and Reliability: Constructed from chrome steel for both rings and balls, the bearing provides high fatigue life and wear resistance. It comes pre-lubricated and operates effectively within a temperature range of -30°C to 110°C.
71918 CD/P4AQBCD Bearing Typical Application Areas
- High-Precision Machine Tool Spindles: For grinding, milling, and turning centers requiring extreme rigidity and accuracy.
- Industrial Pumps and Compressors: Where high axial and radial loads are present.
- High-Speed Robotic Drives and Precision Gearboxes: Demanding compact, high-stiffness bearing arrangements.
- Aerospace and Defense Actuation Systems: Applications needing reliable performance under severe operating conditions.
