7021 CD/P4AQBCC
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7021 CD/P4AQBCC
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
15 °
Ball & Washer Dimensions
Ball diameter
17.462 mm
Ball quantity
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
57375 lbf
Radial static load rating
87750 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
Price available upon request.
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7021 CD/P4AQBCC Bearing Product Overview & Core Advantages
The 7021 CD/P4AQBCC is a precision angular contact ball bearing supplied as a Quadruplex Back-to-Back (QBC) matched set. Engineered to the exacting P4A tolerance class, this configuration is designed for applications demanding exceptional rotational accuracy, high system rigidity, and the capacity to handle complex combined loads. Its preloaded, matched arrangement ensures optimal performance and stability in high-precision machinery.
7021 CD/P4AQBCC Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| CD | Indicates a 15° contact angle and specific internal design optimized for high rigidity. |
| P4A | Denotes a high-precision tolerance class with running accuracy superior to ABEC 7, ensuring minimal runout and vibration. |
| QBCC | Specifies a Quadruplex (4-bearing) Back-to-Back (C) arrangement with a Moderate (C) preload. This matched set is factory-configured for immediate installation and optimal performance. |
7021 CD/P4AQBCC Bearing Structural Features & Performance Benefits
- Exceptional Rigidity and Load Capacity: The Quadruplex Back-to-Back (QBC) arrangement provides an extremely stiff bearing system capable of withstanding heavy combined radial and axial loads from both directions. The 15° contact angle is ideal for applications where high moment stiffness is required.
- High-Speed Capability: The lightweight, durable phenolic resin cage minimizes centrifugal forces and friction, contributing to a high limiting speed of 16,000 rpm. This makes the bearing suitable for demanding high-speed applications.
- Precision Performance: Manufactured to P4A tolerance with tight dimensional control on the bore diameter, outside diameter, and width, this bearing ensures smooth, quiet, and accurate operation with minimal runout.
- Optimized for Performance: The bearings are pre-lubricated and supplied as a preloaded, matched set, ensuring consistent performance, simplified installation, and immediate operational readiness.
7021 CD/P4AQBCC Bearing Typical Application Areas
This high-precision, high-rigidity bearing set is ideally suited for the most demanding applications, including:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Gearboxes: Especially in robotics and high-performance automotive systems.
- High-Frequency Spindles: Used in PCB drilling and routing.
- Medical Equipment: Such as high-speed dental handpieces and imaging scanners.
- Aerospace Actuation Systems: Where reliability and precision under load are critical.
