71904 ACDGA/P4A
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
- Fast delivery
- Free shipping on orders over $200
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71904 ACDGA/P4A Bearing Product Overview & Core Advantages
The 71904 ACDGA/P4A is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and rigidity. As a single-row bearing with a 25° contact angle, it is optimized to handle high axial loads in one direction while supporting significant radial loads. Manufactured to P4A tolerance class, it guarantees ultra-precise dimensions and minimal runout, making it ideal for high-speed spindles and other high-precision machinery. Its extra light preload (Class A) ensures smooth, quiet operation with minimal heat generation from the outset.
71904 ACDGA/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71904 | Bearing series and size designation (9mm width, 20mm bore, 37mm OD) |
| AC | Angular Contact design with a 25° contact angle |
| DGA | Universal Matchable bearing, supplied as part of a matched set of 3 bearings (SU designation) |
| P4A | Super-precision tolerance class, exceeding ABEC 7 standards for dimensional and running accuracy |
71904 ACDGA/P4A Bearing Structural Features & Performance Benefits
High-Speed Capability: The phenolic resin cage offers excellent strength-to-weight ratio and low friction, contributing to the high limiting speed of 75,000 rpm. This makes the bearing suitable for demanding high-speed applications.
Rigidity & Load Capacity: The 25° contact angle and robust construction provide high rigidity, enabling the bearing to handle combined radial and axial loads effectively. With a dynamic load rating of 1287 lbf and static load rating of 686 lbf, it delivers reliable performance under significant stress.
Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control on bore, outside diameter, and width, this bearing ensures minimal vibration and precise shaft positioning.
Universal Matching: Designed as a Universal Matchable (SU) bearing and supplied in a set of three, it allows for flexible mounting arrangements (DB, DF, DT) to achieve the required system rigidity and preload.
71904 ACDGA/P4A Bearing Typical Application Areas
The 71904 ACDGA/P4A is ideally suited for high-performance applications where precision and speed are critical. Key industries and equipment include:
- Machine Tool Spindles for CNC machining centers and grinders
- High-Frequency Spindles in PCB drilling and routing
- Precision Instrumentation and measuring devices
- Robotic Drives and high-precision automation systems
