71904 ACE/P4ADBA
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71904 ACE/P4ADBA
Basic Information
System of measurement
Metric
Weight
0.072 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
20 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
37 mm
Outside diameter tolerance
-0.004mm to 0
Width
18 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
14
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1712 lbf
Radial static load rating
1012 lbf
Limiting speed
75 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
Price available upon request.
Our sales team will respond within 24 hours with a competitive quote tailored to your requirements.
REQUEST A QUOTE
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71904 ACE/P4ADBA Bearing Product Overview & Core Advantages
The 71904 ACE/P4ADBA is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This duplex back-to-back (DB) matched set delivers superior high rigidity and can accommodate combined radial and axial loads simultaneously. Manufactured to P4A tolerance class with an extra light preload (Class A), it ensures smooth operation, minimal vibration, and is ideally suited for high-speed spindles and other precision machinery where rotational accuracy is paramount.
71904 ACE/P4ADBA Bearing Model Code Explained, Specifications & Naming Convention
The model number 71904 ACE/P4ADBA provides detailed technical specifications:
- 71904: Basic bearing series, indicating a light series angular contact ball bearing with a 20mm bore, 37mm OD, and 18mm width.
- ACE: Internal design suffix. 'A' denotes a 25° contact angle, 'C' indicates a P4A dimensional and running accuracy class, and 'E' signifies a high-capacity optimized internal design.
- P4A: Tolerance class, specifying ultra-precise dimensional and running accuracy (superior to ABEC 7).
- DB: Duplex Back-to-Back arrangement. This configuration provides high moment rigidity and is optimal for applications with overturning moments.
71904 ACE/P4ADBA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex back-to-back (DB) arrangement of two bearings creates a rigid support system that effectively resists moment loads and provides exceptional stability under complex combined loads.
- Precision Performance: Built to P4A tolerance class with an extra light preload, this bearing set minimizes runout and ensures smooth, precise rotation, which is critical for high-speed and high-accuracy applications.
- Optimized High-Speed Operation: The phenolic resin cage is lightweight and robust, contributing to lower centrifugal forces and enabling a high limiting speed of 75,000 rpm. The standard lubrication is suitable for this operational range.
- Durable Construction: Manufactured from chrome steel for both rings and balls, the bearing offers high fatigue life and reliable performance within a temperature range of -30°C to 110°C.
71904 ACE/P4ADBA Bearing Typical Application Areas
This precision bearing set is engineered for high-performance applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling machines, precision grinders.
- High-Frequency Motors: Spindles for routers and other high-RPM equipment.
- Medical Equipment: High-speed centrifuges and dental handpieces.
- Robotics: Precision joints and arms requiring high rigidity and accuracy.
