71906 ACD/P4AQBCC
71900 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71906 ACD/P4AQBCC
Basic Information
System of measurement
Metric
Weight
0.19 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
30 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
47 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
20
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
4005 lbf
Radial static load rating
3892 lbf
Limiting speed
83 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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71906 ACD/P4AQBCC Bearing Product Overview & Core Advantages
The 71906 ACD/P4AQBCC is a super-precision quadruplex angular contact ball bearing designed for the most demanding applications. This metric system bearing is characterized by its P4A tolerance class and moderate preload (Class C), ensuring exceptional running accuracy and rotational stability. Its core advantage lies in the matched quadruplex back-to-back (QBC) arrangement, which provides extremely high rigidity and superior capacity to handle combined loads (radial and axial loads from both directions). This configuration makes it ideal for high-speed, high-precision spindles requiring maximum system stiffness.
71906 ACD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
The model number 71906 ACD/P4AQBCC is decoded as follows:
- 71906: Basic bearing series, indicating a super-precision angular contact design with a 30mm bore, 47mm OD, and 36mm width.
- AC: Angular Contact design with a 25° contact angle.
- D: Signifies a duplex (two-bearing) set as the fundamental building block.
- /P4A: Denotes an ultra-precision tolerance class (P4A), exceeding ABEC 7/ISO P4 standards for exceptional dimensional and running accuracy.
- QB: Indicates a Quadruplex Back-to-Back matched set arrangement.
- CC: Specifies a Moderate Preload (Class C) applied to the matched set.
71906 ACD/P4AQBCC Bearing Structural Features & Performance Benefits
- Unmatched Rigidity & Load Capacity: The quadruplex back-to-back (QBC) arrangement creates a highly rigid bearing system capable of withstanding heavy combined loads and moments. The 25° contact angle is optimized for sustaining significant axial loads.
- Super-Precision Performance: Manufactured to P4A tolerance class with a phenolic resin cage, this bearing ensures minimal runout, smooth operation, and low vibration levels, which is critical for maintaining machining or positioning accuracy.
- Optimized for High-Speed Operation: The lightweight phenolic cage and precision-ground chrome steel components allow for a high limiting speed of 83,000 rpm (grease lubricated), making it suitable for very high-speed spindle applications.
- Pre-Configured & Ready-to-Install: The set comes as a matched quadruplex set with a pre-applied moderate preload (Class C). This eliminates complex on-site setup, ensures immediate optimal performance, and guarantees load-sharing among the four bearings.
71906 ACD/P4AQBCC Bearing Typical Application Areas
This high-performance bearing is engineered for advanced machinery requiring the utmost precision and speed.
- High-Frequency CNC Spindles for milling, grinding, and drilling
- Precision Machine Tool Spindles
- High-Speed Robotic Drives
- Advanced Medical Equipment spindles
- Aerospace Testing Equipment
