71821 CDGA/P4
71800 Series Super Precision Angular Contact Ball Bearings
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71821 CDGA/P4 Bearing Product Overview & Core Advantages
The 71821 CDGA/P4 is a high-precision angular contact ball bearing designed for applications demanding exceptional accuracy and reliability. Engineered to a P4 tolerance class, it offers superior running accuracy and dimensional stability. Its key advantage lies in its ability to accommodate combined loads, efficiently handling both radial and axial forces in one direction. The extra light preload (Class A) minimizes deflection under light loads, ensuring smooth, precise operation. With its compact cross-section and universal matchable (SU) design, it is ideal for high-speed spindles and other precision machinery where space is limited and performance is critical.
71821 CDGA/P4 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71821 | Basic bearing designation, indicating a metric series bearing with a 105 mm bore and 130 mm outside diameter. |
| C | Specifies a 15° contact angle, optimized for high-speed applications and axial load capacity. |
| DG | Indicates the bearing is part of a Universal Matchable (SU) set. Two bearings can be paired in a "back-to-back" (DB) or "face-to-face" (DF) arrangement to accommodate combined or moment loads. |
| A | Denotes an Extra Light Preload (Class A), which reduces runout and improves positional accuracy under light operational loads. |
| /P4 | Specifies the tolerance class P4, indicating very high precision in dimensions and running accuracy, superior to standard ABEC-7 specifications. |
71821 CDGA/P4 Bearing Structural Features & Performance Benefits
- High Precision & Rigidity: Manufactured to P4 tolerance standards with a phenolic cage, this bearing ensures minimal vibration and high running accuracy, providing the stiffness required for precision applications.
- Optimized Load Capacity: The 15° contact angle is engineered to support significant axial loads in one direction while also handling substantial radial loads, making it suitable for combined load scenarios.
- Superior High-Speed Performance: The lightweight and robust phenolic resin cage is ideal for high-speed operation, contributing to a high limiting speed of 16,000 rpm. The open design allows for efficient lubrication management.
- Universal Matching Capability (SU): As a universal matchable bearing, it can be precisely paired with another identical bearing to form a pre-adjusted set, simplifying installation and ensuring optimal performance in duplex arrangements.
71821 CDGA/P4 Bearing Typical Application Areas
This high-precision bearing is ideally suited for demanding applications where accuracy, speed, and rigidity are paramount. Key industries and machinery include:
- Machine Tool Spindles (High-speed milling, grinding, and turning centers)
- Precision Grinding Spindles
- High-Frequency Motors
- Medical and Dental Equipment (e.g., high-speed handpieces)
- Aerospace Positioning Systems
