71821 CD/P4
71800 Series Super Precision Angular Contact Ball Bearings
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Main Dimensions
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71821 CD/P4 Bearing Product Overview & Core Advantages
The 71821 CD/P4 is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and rigidity. Designed to accommodate primarily axial loads in one direction, combined with moderate radial loads, its compact cross-section makes it ideal for space-constrained, high-speed arrangements. Manufactured to a P4 (ABEC-7) tolerance class, it guarantees superior running accuracy, low noise, and low vibration, making it a critical component for high-reliability machinery.
71821 CD/P4 Bearing Model Code Explained, Specifications & Naming Convention
- 71821: Basic bearing designation indicating a single-row angular contact ball bearing with a 105 mm bore and 130 mm outside diameter.
- CD: Signifies a specific contact angle of 15° and a matched preload applied to the bearing, optimizing it for high rigidity and precise shaft positioning.
- P4: Denotes the tolerance class, equivalent to ABEC-7, indicating ultra-precision manufacturing for minimal runout and vibration.
71821 CD/P4 Bearing Structural Features & Performance Benefits
High Rigidity and Precision: The optimized 15° contact angle and preload ensure high system rigidity, minimizing deflection under load for superior machining or positioning accuracy.
High-Speed Capability: The lightweight and durable phenolic resin cage guides the balls effectively, reducing friction and centrifugal forces, enabling stable operation up to the specified limiting speed.
Superior Load Capacity: The bearing's design and use of high-grade chrome steel for rings and balls provide excellent dynamic and static load ratings for its compact size.
Pre-Lubricated for Immediate Use: The bearing is supplied lubricated, ready for installation and initial operation within its specified temperature range.
71821 CD/P4 Bearing Typical Application Areas
This precision bearing is ideally suited for demanding applications where high speed, accuracy, and rigidity are paramount, including:
- Machine Tool Spindles (high-speed milling, grinding)
- Precision Gearboxes
- High-Frequency Motors
- Medical and Laboratory Equipment
- Aerospace Actuation Systems
