71904 ACD/P4ADGA
71900 Series Super Precision Angular Contact Ball Bearings
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71904 ACD/P4ADGA Bearing Product Overview & Core Advantages
The 71904 ACD/P4ADGA is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. As part of a universally matchable (SU) set, it is engineered to accommodate combined loads—significant radial loads and axial loads in one direction. Its P4A tolerance class and extra light preload (Class A) ensure minimal runout and smooth, precise operation, making it ideal for high-rigidity, high-reliability systems.
71904 ACD/P4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71904 | Standard bearing series designation, indicating a 20mm bore, 37mm OD, and 18mm width. |
| AC | Angular Contact design with a 25° contact angle for optimal axial load capacity. |
| D | Indicates a universally matchable (SU) bearing, allowing for flexible mounting in pairs to handle bidirectional axial loads. |
| P4A | Denotes a high-precision tolerance class (superior to ABEC 7), ensuring extremely tight dimensional and running accuracy. |
| DGA | Signifies the bearing is lubricated and supplied as part of a universally matched pair (2 bearings in set). |
71904 ACD/P4ADGA Bearing Structural Features & Performance Benefits
High Rigidity and Load Capacity: The angular contact design with a 25° contact angle provides excellent resistance to combined radial and axial loads. When mounted in a universally matched pair, the set creates a highly rigid bearing system capable of handling thrust loads from both directions.
Super-Precision Performance: Manufactured to P4A tolerance standards and featuring an extra light preload, this bearing minimizes vibration and heat generation, contributing to superior running accuracy and extended service life.
High-Speed Capability: The lightweight phenolic resin cage and optimized internal geometry enable a high limiting speed of 100,500 rpm, making it suitable for very high-speed spindles.
Optimized Material Selection: Constructed from chrome steel for both rings and balls, the bearing offers high fatigue resistance and durability under demanding operating conditions.
71904 ACD/P4ADGA Bearing Typical Application Areas
The 71904 ACD/P4ADGA is ideally suited for high-precision, high-speed machinery where accuracy and rigidity are paramount. Key applications include:
- Machine Tool Spindles (High-speed milling, grinding, and turning centers)
- Precision Robotics (High-accuracy robotic arms and joints)
- High-Frequency Spindles (PCB drilling and routing machines)
- Medical Equipment (Dental handpieces, high-speed centrifuges)
- Aerospace Instrumentation (Gyroscopes, navigation systems)
