71972 ACDMA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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Materials
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71972 ACDMA/P4A Bearing Product Overview & Core Advantages
The 71972 ACDMA/P4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. Engineered to a P4 (ABEC-7) tolerance class, it excels in handling combined loads, offering robust performance under significant radial and axial forces. Its single-row design with a 25° contact angle is optimized for high-speed operation, making it an ideal choice for machine tool spindles and other high-performance machinery where high rigidity and precision are paramount.
71972 ACDMA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71972 | Basic bearing series and size designation. |
| AC | Angular Contact design, optimized for combined loads. |
| DM | Duplex Matched set. This is a single bearing that is pre-configured for a specific preload and stiffness. |
| A | Specific contact angle (25°) and internal design for high axial load capacity. |
| P4 | Indicates a high-precision tolerance class (equivalent to ABEC-7), ensuring minimal runout and superior running accuracy. |
71972 ACDMA/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Load Capacity: The 25° contact angle and duplex matched (DM) construction provide superior stiffness, enabling the bearing to handle high combined radial and axial loads effectively. The high dynamic (83,475 lbf) and static (150,750 lbf) load ratings confirm its robust performance.
- High-Speed Performance: The lightweight phenolic resin cage minimizes centrifugal forces, contributing to a high limiting speed of 3,200 rpm. This makes it a true high-speed bearing for demanding spindle applications.
- Precision Engineering: Manufactured to P4 precision tolerances, this bearing ensures minimal vibration and exceptional running accuracy, which is critical for the surface finish and precision of machined parts.
- Optimized Material Selection: The use of chrome steel for rings and balls ensures high durability and wear resistance, suitable for a wide operating temperature range from -30°C to 110°C.
71972 ACDMA/P4A Bearing Typical Application Areas
The 71972 ACDMA/P4A is ideally suited for high-precision, high-speed machinery, including:
- Machine Tool Spindles (CNC machining centers, grinding spindles)
- High-Frequency Motors
- Precision Gearboxes
- Aerospace Positioning Systems
- Medical and Laboratory Equipment
