71904 CD/P4ADT
71900 Series Super Precision Angular Contact Ball Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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71904 CD/P4ADT Bearing Product Overview & Core Advantages
The 71904 CD/P4ADT is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This duplex tandem (DT) arrangement consists of two matched bearings preloaded against each other, delivering superior axial rigidity and the ability to handle significant combined loads. Manufactured to the exacting P4A tolerance class, it is ideal for high-speed spindles and other precision machinery where minimal runout and high rotational accuracy are critical.
71904 CD/P4ADT Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71904 | Bearing series and size designation (20mm bore, 37mm OD) |
| C | 15° contact angle |
| D | Duplex bearing designation |
| P4A | High precision tolerance class (exceeds ABEC 7) |
| DT | Duplex Tandem arrangement for maximum axial load capacity in one direction |
71904 CD/P4ADT Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The duplex tandem configuration stacks two bearings to create an exceptionally rigid assembly, capable of supporting heavy combined radial and axial loads in one direction. This design is optimized for applications where shaft preload and minimal deflection are paramount.
Precision Performance: Manufactured to P4A tolerance standards, this bearing ensures extremely tight dimensional and running accuracy, contributing to smooth operation and reduced vibration in high-speed applications.
Optimized High-Speed Design: The phenolic resin cage is lightweight and robust, enabling stable operation at the high limiting speed of 80,000 rpm. The 15° contact angle provides an excellent balance between radial and axial load capacity for swift acceleration.
Premium Materials: Constructed from chrome steel for both rings and balls, the bearing offers high durability, wear resistance, and long service life under demanding operating conditions.
71904 CD/P4ADT Bearing Typical Application Areas
The 71904 CD/P4ADT is engineered for high-performance machinery, including:
- Machine Tool Spindles (High-speed machining centers, grinding spindles)
- Precision Rotary Systems
- High-Frequency Motors
- Medical and Dental Equipment Spindles
- Aerospace Instrumentation
