7021 ACDGB/P4A
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7021 ACDGB/P4A
Basic Information
System of measurement
Metric
Weight
1.59 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
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
Price:
$ 355.45
/ each
In Stock
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7021 ACDGB/P4A Bearing Product Overview & Core Advantages
The 7021 ACDGB/P4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This single bearing features a 25° contact angle and a Light preload (Class B), making it ideal for supporting combined radial and axial loads. Manufactured to P4A tolerance class, it guarantees superior running accuracy and is Universal Matchable (SU), allowing for precise arrangement in sets of three to achieve optimal system performance. Its compact design and high load capacity make it a cornerstone for high-speed, high-rigidity applications.
7021 ACDGB/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 7021 | Basic bearing series and size designation | Defines the core dimensions: 105mm bore, 160mm OD, 26mm width. |
| AC | Angular Contact | Optimized for combined loads with a defined 25° contact angle. |
| DGB | Back-to-Back Duplex Set (Universal Matchable) | Indicates the bearing is part of a Universal Matchable (SU) set, designed to be mounted in a back-to-back (DB) arrangement for high moment rigidity. |
| P4A | Tolerance Class | Denotes a high-precision bearing with extremely tight dimensional and running accuracy tolerances, superior to ABEC-7. |
7021 ACDGB/P4A Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The angular contact design with a 25° contact angle and light preload provides excellent resistance to both radial and axial forces, ensuring stable operation under combined loads. The dynamic load rating of 20,340 lbf and static load rating of 20,925 lbf confirm its robust performance.
- High-Speed Capability: The phenolic resin cage is lightweight and strong, reducing centrifugal forces and allowing for a high limiting speed of 16,000 rpm. This makes it suitable for high-speed spindles.
- Precision Engineering: Manufactured to P4A tolerance class, this bearing ensures minimal runout and vibration, which is critical for applications demanding extreme accuracy. The tight bore and outside diameter tolerances (both -0.004mm to 0) guarantee a precise fit.
- Optimized Internal Geometry: With 21 precision balls made of chrome steel and a diameter of 17.462 mm, the bearing is engineered for smooth operation and long service life.
7021 ACDGB/P4A Bearing Typical Application Areas
This precision bearing is engineered for high-performance machinery where accuracy, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes: Robotics and high-accuracy power transmission systems.
- High-Frequency Motors and Spindles: Applications requiring minimal vibration at high rotational speeds.
- Medical and Laboratory Equipment: Centrifuges and imaging devices that demand silent and precise rotation.
