7021 ACD/HCP4AQBCD
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7021 ACD/HCP4AQBCD
Basic Information
System of measurement
Metric
Weight
5.27 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
16.25 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
Heavy / Class D
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
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7021 ACD/HCP4AQBCD Bearing Product Overview & Core Advantages
The 7021 ACD/HCP4AQBCD is a precision quadruplex matched set of angular contact ball bearings designed for applications demanding exceptional rigidity and high load capacity. This metric system bearing features a Quadruplex Back-to-Back (QBC) arrangement, providing superior stability and the ability to withstand combined loads (radial and axial) from both directions simultaneously. Manufactured to a P4A tolerance class with a Heavy preload (Class D), it is engineered for high-precision, high-reliability machinery where maximum stiffness is critical.
7021 ACD/HCP4AQBCD Bearing Model Code Explained, Specifications & Naming Convention
The model number 7021 ACD/HCP4AQBCD is decoded as follows:
- 7021: Basic bearing series, indicating a 105 mm bore, 160 mm outside diameter.
- A: 25° contact angle, optimized for high axial load capacity.
- CD: Indicates a duplex (two-bearing) set. In this context, it is part of a larger matched set designation.
- HC: High Capacity internal design.
- P4A: High precision tolerance class (exceeding ABEC 7/ISO P4).
- QBC: Quadruplex Back-to-Back arrangement. This specifies that four bearings are supplied as a precision-matched set mounted in a back-to-back configuration.
- D: Heavy preload (Class D).
7021 ACD/HCP4AQBCD Bearing Structural Features & Performance Benefits
- Maximum Rigidity & Load Capacity: The Quadruplex Back-to-Back (QBC) arrangement creates an extremely rigid bearing system, capable of handling very high radial dynamic load ratings (54,450 lbf) and static load ratings (82,125 lbf). This configuration effectively resists moment loads and provides stable shaft support under combined loads.
- High-Speed Capability: The combination of a lightweight phenolic cage and ceramic balls (Silicon Nitride) reduces centrifugal forces, lowers operating temperature, and allows for a high limiting speed (16,250 rpm).
- Precision Performance: Manufactured to P4A tolerance class with a 25° contact angle and heavy preload, this set ensures minimal runout, precise rotational accuracy, and consistent performance in demanding applications.
- Advanced Material Construction: The use of ceramic balls provides advantages including electrical insulation, reduced weight, and superior performance in high-speed and high-temperature environments compared to steel balls.
7021 ACD/HCP4AQBCD Bearing Typical Application Areas
This bearing set is ideally suited for high-end industrial equipment requiring the ultimate in precision and stiffness, such as:
- High-Speed Machine Tool Spindles
- Precision Grinding Spindles
- High-Rigidity Industrial Robots
- Advanced Aerospace & Defense Systems
