71826 CD/P4QBCB
71800 Series Super Precision Angular Contact Ball Bearings
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71826 CD/P4QBCB Bearing Product Overview & Core Advantages
The 71826 CD/P4QBCB is a precision angular contact ball bearing configured as a Quadruplex Back-to-Back (QBC) matched set. Engineered for the most demanding applications, this bearing arrangement delivers exceptional system rigidity and can accommodate combined loads (radial and axial) from both directions. Manufactured to P4 tolerance class with a light preload (Class B), it is the ideal solution for high-precision, high-stiffness spindles and machinery requiring ultimate rotational accuracy and stability.
71826 CD/P4QBCB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71826 | Basic bearing designation, indicating a 130mm bore, 165mm OD, and 72mm width. |
| C | Specifies a 15° contact angle, optimized for high-speed operation and moderate axial load capacity. |
| D | Indicates the bearing is part of a matched set with specific pre-load and runout tolerances. |
| P4 | Denotes a high-precision tolerance class superior to ABEC-7, ensuring minimal dimensional and running inaccuracies. |
| QBC | Defines the matched arrangement as Quadruplex Back-to-Back, utilizing four bearings for maximum system rigidity and moment load resistance. |
| B | Specifies the light preload level (Class B), reducing friction and heat generation for very high-speed applications. |
71826 CD/P4QBCB Bearing Structural Features & Performance Benefits
Unmatched Rigidity: The Quadruplex Back-to-Back (QBC) arrangement creates an extremely rigid bearing system, capable of withstanding heavy moment loads and preventing shaft deflection under operation. This is critical for maintaining precision in machine tool spindles.
Superior Precision & Speed: Manufactured to P4 tolerance standards and featuring a lightweight, high-strength phenolic cage, this bearing achieves a high limiting speed of 11,000 rpm. The 15° contact angle and light preload are optimized for these high-speed conditions.
High Load Capacity: With a dynamic load rating of 22,725 lbf and a static load rating of 47,700 lbf, this matched set is designed for significant combined radial and axial loads. The use of 35 high-quality chrome steel balls ensures load distribution and long service life.
Optimized for Performance: The open seal type allows for efficient lubrication management, while the tight dimensional tolerances on the bore, outside diameter, and width ensure precise fit and predictable performance.
71826 CD/P4QBCB Bearing Typical Application Areas
This high-precision, high-rigidity bearing set is specifically designed for advanced industrial machinery where accuracy and stability are paramount.
- High-Speed Machine Tool Spindles: CNC milling centers, grinding spindles, and jig borers.
- Precision Rotary Tables: Indexing and rotary tables for machining and inspection.
- High-Frequency Machining Centers: Applications demanding extreme rotational speeds and minimal runout.
- Other Precision Rotary Equipment: Including high-performance pumps and precision test equipment.
