71904 ACE/P4ADT
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
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71904 ACE/P4ADT Bearing Product Overview & Core Advantages
The 71904 ACE/P4ADT is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and reliability. This duplex tandem (DT) arrangement provides superior axial rigidity and is capable of handling high combined loads. Manufactured to P4A tolerance class, it ensures minimal runout and smooth operation, making it ideal for high-speed spindles and precision machinery. The preloaded configuration eliminates internal clearance, delivering immediate response and enhanced system stiffness.
71904 ACE/P4ADT Bearing Model Code Explained, Specifications & Naming Convention
- 71904: Basic designation indicating a 20mm bore, 37mm OD angular contact bearing series.
- ACE: Signifies a 25° contact angle and specific internal design optimized for high-speed operation.
- P4A: Denotes an ultra-precision tolerance class with enhanced dimensional and running accuracy.
- DT: Indicates a Duplex Tandem matched set of two bearings, configured to maximize axial load capacity in one direction.
71904 ACE/P4ADT Bearing Structural Features & Performance Benefits
The bearing's performance stems from its optimized design. The duplex tandem arrangement of two bearings creates a highly rigid system that excels under heavy axial loads. The 25° contact angle provides an optimal balance between radial and axial load capacity. The phenolic resin cage offers excellent strength-to-weight ratio, contributing to lower inertia and higher limiting speeds (up to 75,000 rpm). Manufactured from chrome steel for both rings and balls, it ensures long-term durability and consistent performance within a temperature range of -30°C to 110°C. The factory-applied preload ensures zero clearance operation, critical for applications requiring high positional accuracy.
71904 ACE/P4ADT Bearing Typical Application Areas
This high-precision bearing is specifically engineered for applications where high rigidity and exceptional running accuracy are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy positioning systems.
- Medical Equipment: Dental handpieces, centrifuges, and imaging devices.
- Aerospace Systems: Gyroscopes, actuator mechanisms, and auxiliary power units.
