71904 ACD/P4ATBTB
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71904 ACD/P4ATBTB
Basic Information
System of measurement
Metric
Weight
0.11 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
27 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
15
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
2790 lbf
Radial static load rating
2059 lbf
Limiting speed
100.5 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Triplex Back-to-Back (TBT)
Number of bearings in matched set
3
Universal matching bearing
No (Standard)
Preload
Light / Class B
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
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71904 ACD/P4ATBTB Bearing Product Overview & Core Advantages
The 71904 ACD/P4ATBTB is a super-precision angular contact ball bearing designed for the most demanding applications. This matched triplex set in a back-to-back (TBT) arrangement delivers exceptional system rigidity and rotational accuracy. Its P4A tolerance class and light preload (Class B) ensure minimal runout and smooth, stable operation under high speeds and complex combined loads. Engineered for superior performance, it is the ideal choice for high-speed spindles and precision machinery requiring ultimate reliability.
71904 ACD/P4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71904 | Basic bearing series and size designation (20mm bore, 37mm OD). |
| ACD | Angular Contact design with a 25° contact angle. |
| P4A | Indicates an ultra-high precision tolerance class, exceeding ABEC 7 standards. |
| TBT | Specifies a Triplex Back-to-Back matched set of three bearings. |
71904 ACD/P4ATBTB Bearing Structural Features & Performance Benefits
- Unmatched Rigidity and Stability: The triplex back-to-back arrangement creates a highly rigid bearing system that effectively resists moment loads and shaft deflection, crucial for maintaining precision in machining operations.
- Superior High-Speed Capability: The lightweight phenolic resin cage and optimized internal geometry contribute to low friction and heat generation, enabling a high limiting speed of 100,500 rpm.
- High-Precision Operation: Manufactured to P4A tolerance class with a light preload, this bearing ensures minimal axial and radial runout, resulting in superior positioning accuracy and smooth rotation.
- Optimized Load Capacity: The 25° contact angle is engineered to handle significant combined radial and axial loads simultaneously, providing robust performance in demanding conditions.
- Premium Material Construction: Made from chrome steel for both rings and balls, this bearing offers high durability, wear resistance, and a long operational lifespan.
71904 ACD/P4ATBTB Bearing Typical Application Areas
This super-precision angular contact ball bearing is specifically engineered for high-performance applications, including:
- High-Frequency CNC Spindles for milling, grinding, and drilling
- Precision Machine Tool Axles and rotary tables
- High-Speed Robotic Drives and servo motors
- Advanced Medical and Dental Equipment spindles
- Aerospace Test Rigs and instrumentation
