71904 ACD/P4ATBTD
71900 Series Super Precision Angular Contact Ball Bearings
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71904 ACD/P4ATBTD Bearing Product Overview & Core Advantages
The 71904 ACD/P4ATBTD is a super-precision angular contact ball bearing designed for the most demanding applications. This metric bearing features a triplex back-to-back (TBT) matched set with a Heavy (Class D) preload, delivering exceptional system rigidity and rotational accuracy. Its primary advantage lies in its ability to handle combined loads (radial and axial) simultaneously with superior stability, making it ideal for high-speed, high-precision machinery where uncompromising performance is critical.
Model Code Breakdown
- 71904: Basic bearing series, denoting a super-precision, light-weight angular contact design.
- ACD: Angular Contact design with a D contact angle of 25°.
- P4A: P4 indicates a very high tolerance class (geometric accuracy beyond ABEC 7), and A signifies a specific tolerance range for the contact angle.
- TBT: Triplex Back-to-Back arrangement. This denotes a set of three bearings matched and mounted back-to-back.
- D: Denotes a Heavy preload applied to the matched set, maximizing rigidity.
71904 ACD/P4ATBTD Bearing Structural Features & Performance Benefits
Optimized Rigidity & Load Capacity: The triplex back-to-back (TBT) configuration creates an extremely rigid bearing system, capable of withstanding heavy moment loads and complex combined loads. The Heavy preload (Class D) eliminates internal clearance, ensuring precise shaft positioning and minimal deflection under load.
High-Speed Capability: The lightweight phenolic resin cage reduces centrifugal forces, contributing to a high limiting speed of 100,500 rpm. The standard lubrication is formulated for stable performance within this range.
Precision & Durability: Manufactured to a P4A tolerance class, this bearing guarantees exceptional running accuracy. The chrome steel rings and balls provide high hardness and wear resistance for long service life in precision applications.
71904 ACD/P4ATBTD Bearing Typical Application Areas
This high-performance bearing is engineered for advanced machinery requiring supreme accuracy and stiffness, including:
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Robotic Drives
- Advanced Aerospace & Defense Systems
- Medical & Dental Equipment Spindles
