7212 ACD/P4ADBC
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
7212 ACD/P4ADBC
Basic Information
System of measurement
Metric
Weight
1.62 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
60 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
110 mm
Outside diameter tolerance
-0.004mm to 0
Width
44 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
14.288 mm
Ball quantity
16
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
19890 lbf
Radial static load rating
20250 lbf
Limiting speed
36 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
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
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In Stock
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7212 ACD/P4ADBC Bearing Product Overview & Core Advantages
The 7212 ACD/P4ADBC is a precision duplex angular contact ball bearing designed for applications requiring exceptional rigidity and accuracy. This matched back-to-back (DB) arrangement is preloaded to provide moderate preload (Class C), ensuring high system stiffness and precise rotational performance. It is engineered to handle significant combined loads—simultaneous radial and axial loads—making it ideal for high-precision, high-reliability machinery where positional accuracy is critical.
7212 ACD/P4ADBC Bearing Model Code Explained, Specifications & Naming Convention
The model number 7212 ACD/P4ADBC is decoded as follows:
- 7212: Basic series designation (70mm bore, 110mm OD, 44mm width)
- A: 25° contact angle, optimized for carrying high axial loads
- C: Indicates a moderate preload (Class C) is applied
- D: Denotes a duplex (two-bearing) set
- P4A: High precision tolerance class (superior to ABEC 7), ensuring minimal runout and vibration
- DB: Back-to-Back arrangement, providing high moment rigidity
- C: The final "C" confirms the moderate preload specification for the matched set
7212 ACD/P4ADBC Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) arrangement creates a wide, rigid support system that effectively resists moment loads and shaft deflection, crucial for maintaining accuracy under heavy combined loads.
- Superior Load Capacity: With a 25° contact angle and robust construction, this bearing excels at carrying substantial axial loads in both directions, as well as high radial loads. The dynamic load rating of 19,890 lbf and static rating of 20,250 lbf attest to its durability.
- Precision Performance: Manufactured to P4A tolerance class, it guarantees extremely tight dimensional and running accuracy, minimizing vibration and supporting high-speed operation up to 36,000 rpm.
- Optimized Components: The phenolic cage offers low weight and excellent high-speed performance with minimal friction. The chrome steel rings and balls provide high hardness and long service life.
- Pre-lubricated & Ready for Service: The bearing comes lubricated from the factory, simplifying installation and ensuring immediate, reliable operation within its specified temperature range.
7212 ACD/P4ADBC Bearing Typical Application Areas
This bearing is specifically designed for demanding applications where precision, rigidity, and speed are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Gearboxes and Industrial Pumps.
- High-Frequency Motors and Spindle Drive Systems.
- Robotic Arm Joints and Automated Positioning Systems.
- Aerospace & Defense Actuation Systems.
