71924 ACD/P4AQBCC
71900 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71924 ACD/P4AQBCC
Basic Information
System of measurement
Metric
Weight
4.6 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
120 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
165 mm
Outside diameter tolerance
-0.004mm to 0
Width
88 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
14.288 mm
Ball quantity
28
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
43875 lbf
Radial static load rating
77625 lbf
Limiting speed
10 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
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
71924 ACD/P4AQBCC Bearing Product Overview & Core Advantages
The 71924 ACD/P4AQBCC is a high-precision quadruplex matched bearing set designed for demanding applications requiring exceptional rigidity and accuracy. This angular contact ball bearing configuration, arranged in a Back-to-Back (QBC) quadruplex set, is engineered to handle combined loads with a consistent 25° contact angle. Its primary advantages include superior system rigidity, high running accuracy from its P4A tolerance class, and optimized performance under moderate preload (Class C), making it ideal for ultra-precision and high-stability machinery.
Model Code Deep Explanation
The model number 71924 ACD/P4AQBCC is decoded as follows:
- 71924: Basic series designation for a high-precision angular contact ball bearing with a 120mm bore and 165mm outside diameter.
- ACD: Signifies a 25° contact angle and a specific internal design optimized for high precision.
- P4A: Denotes an ultra-precision tolerance class exceeding ABEC 7 (P4) standards, with enhanced running accuracy requirements.
- QBCC: Indicates the bearing is part of a Quadruplex (4 bearings) matched set in a Back-to-Back (QBC) arrangement, pre-configured for optimal load sharing and stiffness.
71924 ACD/P4AQBCC Bearing Structural Features & Performance Benefits
- Exceptional Rigidity & Load Capacity: The quadruplex back-to-back arrangement creates an extremely rigid bearing system capable of supporting heavy combined radial and axial loads from multiple directions, significantly enhancing machine tool stability.
- High Precision Operation: Manufactured to a P4A ultra-precision tolerance class, this set ensures minimal runout and vibration, which is critical for achieving superior surface finishes and positional accuracy.
- Optimized for High-Speed Applications: The lightweight and robust phenolic cage minimizes centrifugal forces, contributing to stable operation at high rotational speeds, with a limiting speed of 10,000 rpm.
- Pre-Configured Performance: The set is supplied lubricated and matched as a Quadruplex Back-to-Back (QBC) unit under moderate preload (Class C), ensuring immediate, out-of-the-box performance with guaranteed internal fit and load distribution.
71924 ACD/P4AQBCC Bearing Typical Application Areas
This bearing set is specifically designed for the most demanding high-precision and high-rigidity applications, including:
- High-Speed Machine Tool Spindles for milling, grinding, and turning centers.
- Precision Grinding Spindles requiring extreme accuracy and minimal deflection.
- Industrial High-Frequency Motors and high-performance servo drives.
- Aerospace & Defense Positioning Systems such as gyroscopes and radar antennas.
