71820 CDGA/P4
71800 Series Super Precision Angular Contact Ball Bearings
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71820 CDGA/P4 Bearing Product Overview & Core Advantages
The 71820 CDGA/P4 is a single row angular contact ball bearing designed for applications demanding high precision and superior running accuracy. Positioned in the P4 tolerance class, it offers exceptional dimensional stability and rotational precision. A key feature is its Universal Matchable (SU) designation, allowing two bearings to be universally paired in a back-to-back (DB) or face-to-face (DF) arrangement to support combined loads, including significant axial loads in both directions. Its compact cross-section, with a 13mm width, makes it ideal for space-constrained, high-speed applications such as precision spindles.
71820 CDGA/P4 Bearing Model Code Explained, Specifications & Naming Convention
- 71820: Basic bearing series, indicating a light-weight, high-precision angular contact design with a 100mm bore.
- C: Signifies a 15° contact angle, optimized for high-speed performance and moderate axial load capacity.
- DG: Stands for Duplex Ground. The bearing faces are precision ground to a specific preload level for universal matching.
- A: Indicates an Extra Light (Class A) preload. This pre-set internal clearance provides high rigidity and minimal runout for precise applications.
- P4: Denotes the tolerance class, equivalent to ISO Class 4, ensuring extremely tight dimensional and running accuracy tolerances.
71820 CDGA/P4 Bearing Structural Features & Performance Benefits
High Precision and Rigidity: Manufactured to P4 tolerance standards with an extra light preload, this bearing delivers exceptional rotational accuracy and system stiffness, minimizing deflection under load.
Superior High-Speed Capability: The 15° contact angle and phenolic resin cage are engineered for high-speed operation, contributing to a limiting speed of 15,000 rpm. The lightweight cage reduces centrifugal forces and ensures smooth operation.
Optimized Load Capacity: The design effectively supports combined radial and axial loads. Its universal matchable (SU) feature allows for the creation of pre-loaded bearing sets that can handle bidirectional axial loads and moments.
Premium Material Construction: Manufactured from chrome steel for both rings and balls, the bearing ensures high durability, wear resistance, and a long operational life under demanding conditions.
71820 CDGA/P4 Bearing Typical Application Areas
The 71820 CDGA/P4 is ideally suited for high-precision, high-speed machinery where accuracy and rigidity are paramount. Key applications include:
- Machine Tool Spindles
- High-Frequency Motors
- Precision Grinding Spindles
- Industrial Pumps and Compressors
- Aerospace and Defense Instrumentation
