7021 ACDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
7021 ACDGA/HCP4A
Basic Information
System of measurement
Metric
Weight
1.32 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
26 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
20340 lbf
Radial static load rating
20925 lbf
Limiting speed
16 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Number of bearings in matched set
3
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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In Stock
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7021 ACDGA/HCP4A Bearing Product Overview & Core Advantages
The 7021 ACDGA/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. This single-row bearing features a 25° contact angle and is supplied as part of a universally matchable set, allowing for flexible arrangement in duplex or triplex configurations to achieve optimal stiffness and load capacity. Its core advantages include the ability to support high combined loads (radial and axial), superior running accuracy due to its P4A tolerance class, and enhanced performance from its ceramic balls and phenolic cage, making it ideal for high-speed operation.
7021 ACDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| A | Denotes a 25° contact angle, optimized for supporting significant axial loads. |
| CDGA | Indicates the bearing is part of a universally matchable set (Universal Matchable SU), allowing any combination of bearings from the set to be paired without loss of preload. |
| HCP4A | Signifies the P4A tolerance class, representing very high dimensional and running accuracy, exceeding standard ABEC 7/ISO P4 levels. |
7021 ACDGA/HCP4A Bearing Structural Features & Performance Benefits
- High-Speed Capability & Rigidity: The combination of a lightweight phenolic resin cage and low-density ceramic (silicon nitride) balls reduces centrifugal forces, enabling higher limiting speeds. The defined contact angle provides high axial and radial stiffness.
- Superior Load Capacity: Designed to handle significant combined loads simultaneously. The radial dynamic load rating of 20,340 lbf and static load rating of 20,925 lbf ensure reliable performance under heavy-duty conditions.
- Precision & Thermal Stability: Manufactured to P4A tolerance class for exceptional running accuracy. The phenolic cage offers excellent dimensional stability across the operating temperature range of -30°C to 110°C.
- Universal Matching: As a Universal Matchable (SU) bearing supplied in a set of three, it offers maximum flexibility for preload adjustment in duplex (DB, DF) or triplex arrangements, simplifying inventory and assembly.
7021 ACDGA/HCP4A Bearing Typical Application Areas
This precision angular contact bearing is ideally suited for high-performance machinery, including:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers requiring extreme accuracy and rigidity.
- High-Frequency Motors & Spindles: Where low inertia and high rotational speeds are critical.
- Precision Robotics: In arm joints and rotary units demanding high stiffness and positional accuracy.
- Aerospace & Defense Systems: Including gyroscopes, radar platforms, and other critical rotating assemblies.
