S71920 ACD/P4ADGB
Sealed Super Precision Angular Contact Ball Bearings
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S71920 ACD/P4ADGB Bearing Product Overview & Core Advantages
The S71920 ACD/P4ADGB is a super-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. As a universal matchable (SU) bearing supplied in a pre-loaded duplex set, it is engineered to accommodate combined loads (radial and axial) simultaneously from both directions. Its P4A tolerance class and optimized internal geometry ensure smooth, quiet operation at high speeds, making it an ideal choice for high-performance spindles and precision machinery where reliability is critical.
S71920 ACD/P4ADGB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S71920 | Basic bearing designation, indicating a 100 mm bore, 140 mm OD, 40 mm width super-precision angular contact ball bearing. |
| ACD | Contact angle of 25° and a universal matchable (SU) design. Two bearings can be paired in a back-to-back (DB) or face-to-face (DF) arrangement to handle bidirectional thrust loads. |
| P4A | High-precision tolerance class, exceeding ABEC 7 (ISO Class 4) standards, ensuring minimal runout and vibration for superior performance. |
| DGB | Indicates a sealed bearing, pre-lubricated with grease. This combination provides excellent contamination protection and long-term, maintenance-free operation. |
S71920 ACD/P4ADGB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex set configuration and 25° contact angle provide significantly increased system rigidity, enabling the bearing to handle substantial combined radial and axial loads from both directions with minimal deflection.
Super-Precision & High-Speed Performance: Manufactured to P4A tolerance class and featuring a lightweight, durable phenolic resin cage, this bearing achieves excellent running accuracy and stability at its maximum limiting speed of 10,000 rpm.
Optimized for Longevity & Reliability: The sealed design effectively excludes contaminants, while the pre-applied grease lubrication ensures consistent performance across a wide operating temperature range (-30°C to 110°C), resulting in a long, maintenance-free service life.
S71920 ACD/P4ADGB Bearing Typical Application Areas
The S71920 ACD/P4ADGB is ideally suited for high-precision, high-speed machinery, including:
- Machine Tool Spindles (CNC machining centers, grinding spindles)
- High-Frequency Motors and Precision Spindles
- Robotic Drives and Rotary Tables
- Medical Equipment and Dental Handpieces
- Aerospace Instrumentation and Optical Scanning Systems
