71924 ACD/P4ADBC
71900 Series Super Precision Angular Contact Ball Bearings
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71924 ACD/P4ADBC Bearing Product Overview & Core Advantages
The 71924 ACD/P4ADBC is a precision angular contact ball bearing configured as a matched duplex pair in a Back-to-Back (DB) arrangement. Engineered for applications demanding exceptional rotational accuracy and rigidity, this bearing is designed to accommodate combined loads, including significant radial and axial loads in both directions. Its P4A tolerance class ensures superior running accuracy, making it ideal for high-speed, high-precision machinery where reliability and performance are critical.
71924 ACD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
- 71924: Basic designation indicating a high-precision angular contact ball bearing series with a 120 mm bore, 165 mm OD, and 44 mm width.
- ACD: Signifies the contact angle of 25° and a Duplex Back-to-Back (DB) arrangement of two matched bearings.
- P4A: Denotes an ultra-precision tolerance class exceeding ABEC 7, with enhanced dimensional and running accuracy.
- DBC: Indicates a Moderate preload (Class C) applied to the matched set for optimal stiffness and reduced deflection under operational loads.
71924 ACD/P4ADBC Bearing Structural Features & Performance Benefits
This bearing's performance is derived from its sophisticated construction. The duplex Back-to-Back (DB) arrangement creates a wide effective spread, significantly enhancing moment rigidity and stability, which is crucial for applications subject to overturning moments. The 25° contact angle provides an excellent balance between radial and axial load capacity. The phenolic resin cage offers superior guidance at high speeds, contributing to a limiting speed of 16,250 rpm. Manufactured to P4A precision tolerances with a moderate preload, this bearing delivers high running accuracy, minimal vibration, and extended service life in demanding conditions.
71924 ACD/P4ADBC Bearing Typical Application Areas
The 71924 ACD/P4ADBC is ideally suited for high-performance applications requiring supreme accuracy and rigidity. Key industries and equipment include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Gearboxes: In robotics, aerospace, and high-end automotive systems.
- High-Frequency Motors and Spindles: Used in PCB drilling and semiconductor manufacturing equipment.
- Medical Equipment: Such as high-speed dental handpieces and imaging device rotors.
