71919 ACD/P4AQBCC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71919 ACD/P4AQBCC
Basic Information
System of measurement
Metric
Weight
2.32 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
95 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
130 mm
Outside diameter tolerance
-0.004mm to 0
Width
72 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
11.112 mm
Ball quantity
28
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
27225 lbf
Radial static load rating
46800 lbf
Limiting speed
16 X 1000 rpm
Lubrication
Lubricated
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
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71919 ACD/P4AQBCC Bearing Product Overview & Core Advantages
The 71919 ACD/P4AQBCC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. As a matched quadruplex set in a back-to-back arrangement (QBC), this bearing group is engineered to handle complex combined loads—significant radial loads and axial loads in both directions—simultaneously. Its P4A tolerance class ensures ultra-precise running accuracy, making it ideal for high-speed spindles and other high-rigidity, high-precision machinery where positional stability is critical.
71919 ACD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
The model number 71919 ACD/P4AQBCC provides a detailed technical specification:
- 71919: Basic series designation, indicating a high-precision angular contact bearing with a 95mm bore, 130mm OD, and 72mm width.
- ACD: Signifies a 25° contact angle, optimized for supporting high axial loads.
- P4A: Denotes an extremely high tolerance class, specifying superior dimensional and running accuracy beyond standard ABEC-7 / ISO P4 levels.
- QBCC: Indicates the bearing is part of a pre-matched Quadruplex (4-bearing) set in a Back-to-Back arrangement (QBC), pre-loaded to a Moderate (Class C) level for immediate, optimized performance.
71919 ACD/P4AQBCC Bearing Structural Features & Performance Benefits
- Exceptional Rigidity and Load Capacity: The quadruplex back-to-back (QBC) matched arrangement creates an extremely stiff bearing system capable of withstanding heavy combined radial and axial loads from any direction, minimizing shaft deflection under load.
- Precision and High-Speed Capability: Manufactured to a P4A tolerance class and featuring a lightweight, robust phenolic cage, this bearing is built for smooth operation and high rotational accuracy, supporting a limiting speed of 16,000 rpm.
- Optimized Preload: The set is supplied with a factory-set moderate preload (Class C), eliminating internal clearance and ensuring immediate high stiffness and precise rotational performance upon installation.
- Durable Construction: Manufactured from chrome steel for both rings and balls, ensuring high durability and long service life under demanding operating conditions.
71919 ACD/P4AQBCC Bearing Typical Application Areas
This high-precision, high-rigidity bearing set is typically employed in:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes and High-Frequency Motor Spindles.
- Industrial Pumps and Compressors requiring high axial stiffness.
- Advanced Robotics and Aerospace Positioning Systems.
