7021 ACD/P4AQBCB
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7021 ACD/P4AQBCB
Basic Information
System of measurement
Metric
Weight
6.37 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
105 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
160 mm
Outside diameter tolerance
-0.004mm to 0
Width
104 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
17.462 mm
Ball quantity
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
54450 lbf
Radial static load rating
82125 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
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
Price available upon request.
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7021 ACD/P4AQBCB Bearing Product Overview & Core Advantages
The 7021 ACD/P4AQBCB is a precision quadruplex matched set of angular contact ball bearings designed for the most demanding applications. Its primary advantage lies in the Back-to-Back (QBC) matched arrangement, which provides exceptional rigidity and stability, enabling it to withstand complex combined loads (radial and axial) from multiple directions. Manufactured to the stringent P4A tolerance class, this bearing ensures high running accuracy and is pre-lubricated for immediate use, making it ideal for high-precision, high-reliability machinery where uncompromising performance is critical.
7021 ACD/P4AQBCB Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| ACD | Angular Contact Design with a 25° contact angle, optimized for carrying significant axial loads. |
| P4A | Indicates a super-precision tolerance class (exceeding ABEC 7), ensuring extremely tight dimensional and running accuracy for superior performance. |
| QBC | Denotes a Quadruplex (4 bearings) Back-to-Back matched set. This configuration is pre-loaded for maximum system rigidity and moment load capacity. |
7021 ACD/P4AQBCB Bearing Structural Features & Performance Benefits
- Unmatched Rigidity and Load Capacity: The quadruplex back-to-back arrangement creates a highly rigid bearing system capable of supporting heavy combined radial and axial loads as well as resisting moment loads. The Light preload (Class B) eliminates internal clearance, enhancing positional accuracy and system stiffness.
- High-Speed Capability: The phenolic resin cage is lightweight and possesses excellent sliding properties, contributing to lower friction and enabling stable operation at high rotational speeds. The optimized internal geometry further supports its high-speed performance.
- Precision and Durability: Manufactured from high-grade chrome steel for both rings and balls, and held to P4A tolerances, this bearing delivers exceptional dimensional stability, long service life, and consistent performance under precision operating conditions.
- Ready-to-Install: The bearing is supplied pre-lubricated and as a complete, matched set, simplifying installation and ensuring optimal performance from startup.
7021 ACD/P4AQBCB Bearing Typical Application Areas
This bearing is engineered for high-precision machinery and systems requiring extreme rigidity and accuracy, including:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Gearboxes: Especially in industrial robotics and aerospace applications.
- High-Frequency Spindles: Used in PCB drilling and routing equipment.
- Medical and Laboratory Equipment: Where smooth, precise, and reliable rotation is mandatory.
