7021 ACD/P4ADBD
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7021 ACD/P4ADBD
Basic Information
System of measurement
Metric
Weight
3.18 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
52 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
33300 lbf
Radial static load rating
41850 lbf
Limiting speed
16 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
Universal matching bearing
No (Standard)
Preload
Heavy / Class D
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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7021 ACD/P4ADBD Bearing Product Overview & Core Advantages
The 7021 ACD/P4ADBD is a precision duplex angular contact ball bearing designed for demanding applications requiring exceptional rigidity and accuracy. This matched back-to-back (DB) arrangement is preloaded to Heavy / Class D specifications, providing superior system stiffness and rotational accuracy. It excels at handling combined radial and axial loads simultaneously, making it an ideal choice for high-precision machinery where minimal deflection under load is critical. Manufactured to the exacting P4A tolerance class, this bearing ensures consistent, high-performance operation.
7021 ACD/P4ADBD Bearing Model Code Explained, Specifications & Naming Convention
The model number 7021 ACD/P4ADBD breaks down as follows:
- 7021: Basic bearing series, indicating a 105 mm bore and 160 mm outside diameter.
- AC: Angular Contact design with a 25° contact angle.
- D: Indicates a Duplex (two-bearing) set.
- /P4A: Denotes a high-precision tolerance class exceeding standard P4 levels.
- DB: Specifies the Back-to-Back mounting arrangement of the duplex set.
- Heavy Preload (Class D): The bearings are pre-loaded to a heavy grade for maximum rigidity.
7021 ACD/P4ADBD Bearing Structural Features & Performance Benefits
- Exceptional Rigidity & Accuracy: The duplex back-to-back (DB) arrangement with a heavy preload creates an extremely rigid bearing system that minimizes axial and radial runout, essential for high-precision spindles.
- High Load Capacity: With a dynamic load rating of 33,300 lbf and static load rating of 41,850 lbf, this bearing is engineered to withstand significant combined radial and axial loads.
- Optimized for Precision: The P4A tolerance class ensures tight dimensional and running accuracy. The phenolic cage offers low weight and excellent performance at high speeds, contributing to a limiting speed of 16,000 rpm.
- Premium Material Construction: Manufactured from chrome steel for both rings and balls, ensuring high durability, wear resistance, and a long operational life under heavy loads.
7021 ACD/P4ADBD Bearing Typical Application Areas
This high-rigidity, precision duplex bearing is typically employed in:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes and High-Frequency Motors.
- Industrial Pumps and Compressors requiring high axial stiffness.
- Robotic Arm Joints and Rotary Tables.
- Any application demanding high rigidity and precise rotational accuracy.
