S71904 ACD/P4AQBCC
Sealed Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
S71904 ACD/P4AQBCC
Basic Information
System of measurement
Metric
Weight
0.15 kg
Tolerance class
P4A
Seal type
Sealed
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
36 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
3398 lbf
Radial static load rating
2745 lbf
Limiting speed
100 X 1000 rpm
Lubrication
Grease
Matched arrangement
Quadruplex Back-to-Back (QBC)
Number of bearings in matched set
4
Universal matching bearing
No (Standard)
Preload
Moderate / Class C
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.
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S71904 ACD/P4AQBCC Bearing Product Overview & Core Advantages
The S71904 ACD/P4AQBCC is a super-precision angular contact ball bearing designed for the most demanding applications. This metric bearing is supplied as a Quadruplex Back-to-Back (QBC) matched set, providing exceptional system rigidity and stability. Its defining characteristics include a P4A tolerance class for superior running accuracy, a 25° contact angle optimized for handling combined radial and axial loads, and phenolic cage construction for high-speed capability. Preloaded to Moderate / Class C, this bearing is ready for installation in high-precision spindles and other machinery requiring uncompromising performance and reliability.
S71904 ACD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with a 25° contact angle. |
| P4A | Indicates a super-precision tolerance class with very tight dimensional and running accuracy limits. |
| QBCC | Specifies a Quadruplex (4-bearing) Back-to-Back (C) arrangement that is preloaded and matched as a set. |
S71904 ACD/P4AQBCC Bearing Structural Features & Performance Benefits
- Unmatched Rigidity and Stability: The Quadruplex Back-to-Back (QBC) matched set configuration creates an extremely stiff bearing system, capable of resisting complex moment loads and maintaining precise shaft positioning under heavy combined loads.
- Super-Precision Performance: Manufactured to P4A tolerance class, this bearing ensures minimal runout and vibration, which is critical for achieving high surface finish quality and machining accuracy.
- High-Speed Capability: The lightweight and robust phenolic cage is engineered for stable operation at high rotational speeds, contributing to the bearing's impressive limiting speed.
- Optimized Load Capacity: The 25° contact angle is ideally suited to support significant axial loads in addition to radial loads, making it a versatile choice for complex loading conditions.
- Sealed and Lubricated for Life: As a sealed unit pre-lubricated with grease, the bearing is protected from contamination and is designed for long-term, maintenance-free operation within its specified temperature range.
S71904 ACD/P4AQBCC Bearing Typical Application Areas
This super-precision bearing is engineered for high-performance machinery where accuracy, speed, and rigidity are paramount. Key applications include:
- High-Frequency Machine Tool Spindles (for milling, grinding, and drilling)
- Precision Grinding Spindles
- High-Speed Robotics and Automation Drives
- Advanced Medical and Dental Equipment Spindles
- Aerospace Test and Measurement Equipment
