7021 CD/P4A
7000 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
7021 CD/P4A
Basic Information
System of measurement
Metric
Weight
1.59 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
105 mm
Bore diameter tolerance
-0.008mm to 0
Outside diameter
160 mm
Outside diameter tolerance
-0.01mm to 0
Width
26 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° to 110 °C
Radial dynamic load rating
21510 lbf
Radial static load rating
21712 lbf
Limiting speed
13 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Preload
Available
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:
$ 335.9
/ each
In Stock
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7021 CD/P4A Bearing Product Overview & Core Advantages
The 7021 CD/P4A is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and rigidity. Manufactured to P4 (ABEC-7) tolerance class, this bearing is designed to accommodate high combined loads, primarily thrust loads in one direction, while also supporting significant radial loads. Its 15° contact angle and phenolic resin cage contribute to superior high-speed performance and thermal stability. Preloaded and pre-lubricated, the 7021 CD/P4A is a ready-to-install solution for machine tool spindles and other demanding equipment.
7021 CD/P4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| CD | Indicates a specific contact angle (15°) and internal design optimized for high rigidity and precise operation. |
| P4A | Denotes a high-precision tolerance class equivalent to ABEC-7. The "A" suffix often specifies dimensional and running accuracy requirements for the bearing's outer ring. |
7021 CD/P4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The single-row angular contact design with a 15° contact angle provides excellent resistance to deflection under load, ensuring stable performance in precision spindles. Manufactured to P4 tolerance, it guarantees minimal runout and vibration.
- Superior Load Capacity: Engineered to support combined loads effectively, with a high dynamic load rating of 21,510 lbf, making it suitable for applications with significant radial and one-directional axial forces.
- Optimized High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, lowers friction, and allows for a high limiting speed of 13,000 rpm. This material also offers excellent dimensional stability at elevated temperatures.
- Preload & Ready-to-Install: Supplied with a preload, the bearing arrives ready for installation, simplifying mounting procedures and ensuring immediate optimal performance with reduced axial play.
7021 CD/P4A Bearing Typical Application Areas
This precision angular contact bearing is ideally suited for high-performance machinery where accuracy and speed are critical. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes: Applications requiring high positional accuracy and low noise.
- High-Frequency Motors and Spindles: Where minimal vibration and high rotational speeds are essential.
- Medical and Laboratory Equipment: Centrifuges and other precision instruments.
