7021 ACD/P4ATBTB
7000 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7021 ACD/P4ATBTB
Basic Information
System of measurement
Metric
Weight
4.78 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
78 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
44775 lbf
Radial static load rating
61875 lbf
Limiting speed
16 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Triplex Back-to-Back (TBT)
Number of bearings in matched set
3
Universal matching bearing
No (Standard)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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7021 ACD/P4ATBTB Bearing Product Overview & Core Advantages
The 7021 ACD/P4ATBTB is a high-precision angular contact ball bearing supplied as a triplex back-to-back (TBT) matched set. This configuration delivers exceptional system rigidity and is engineered to handle complex combined loads, including significant radial and axial loads in both directions. Manufactured to P4A tolerance class, it guarantees superior running accuracy, making it an ideal choice for high-performance applications demanding maximum stiffness and positional accuracy.
7021 ACD/P4ATBTB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 7021 | Basic Bearing Series & Size | Denotes a 105 mm bore, 160 mm OD bearing. |
| ACD | 25° Contact Angle | Optimized for high axial load capacity and high-speed performance. |
| P4A | Tolerance Class | Indicates super-precision dimensional and running accuracy, superior to ABEC 7. |
| TBT | Triplex Back-to-Back | Three bearings are pre-matched and mounted in a back-to-back arrangement to form a single, highly rigid unit. |
7021 ACD/P4ATBTB Bearing Structural Features & Performance Benefits
- Unmatched Rigidity: The triplex back-to-back (TBT) arrangement creates an extremely stiff bearing system, capable of resisting moment loads and minimizing shaft deflection under heavy combined loads.
- Superior Load Capacity: The 25° contact angle and robust construction using chrome steel rings and balls provide high dynamic (44,775 lbf) and static (61,875 lbf) load ratings.
- Optimized High-Speed Operation: The lightweight phenolic cage ensures stable operation and lower centrifugal forces, contributing to the high limiting speed of 16,000 rpm.
- Precision Engineering: The P4A tolerance class ensures minimal runout and vibration, which is critical for applications requiring high rotational accuracy.
- Light Preload (Class B): The set is supplied with a light preload, eliminating internal clearance for precise shaft positioning and immediate stiffness upon installation.
7021 ACD/P4ATBTB Bearing Typical Application Areas
This precision bearing set is designed for the most demanding industrial applications where rigidity, accuracy, and speed are paramount. Key sectors include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes: Especially in robotics and high-torque transmission systems.
- High-Frequency Motors and Spindles: Where minimal runout is required.
- Aerospace & Defense Systems: Actuators, radar systems, and gyroscopes.
- Medical Equipment: High-speed dental handpieces and imaging device rotors.
