71812 ACD/P4DGA
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71812 ACD/P4DGA
Basic Information
System of measurement
Metric
Weight
0.2 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
60 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
78 mm
Outside diameter tolerance
-0.004mm to 0
Width
20 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
5.556 mm
Ball quantity
28
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
4680 lbf
Radial static load rating
5962 lbf
Limiting speed
35 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
Number of bearings in matched set
2
Universal matching bearing
Universal Matchable (SU)
Preload
Extra light / Class A
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:
$ 153.28
/ each
In Stock
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71812 ACD/P4DGA Bearing Product Overview & Core Advantages
The 71812 ACD/P4DGA is a super-precision angular contact ball bearing designed for applications demanding exceptional rotational accuracy and high-speed performance. As a universally matchable (SU) bearing supplied in a pre-set duplex pair, it is engineered to accommodate combined loads (radial and axial) simultaneously. Its P4 tolerance class and extra light preload (Class A) ensure smooth, quiet operation with minimal heat generation, making it ideal for high-precision, high-rigidity spindles and other critical machinery.
71812 ACD/P4DGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71812 | Basic bearing series and size designation (60mm bore, 78mm OD, 20mm width). |
| AC | Angular Contact design with a 25° contact angle. |
| D | Indicates the bearing is part of a universally matchable (SU) duplex set. |
| P4 | Denotes a high-precision tolerance class for superior running accuracy. |
| DGA | Specifies the extra light preload (Class A) applied to the matched set. |
71812 ACD/P4DGA Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The duplex pair arrangement provides significantly increased system rigidity, enabling the bearing to handle substantial combined radial and axial loads with high stability.
- Super-Precision Performance: Manufactured to P4 tolerance standards, this bearing guarantees minimal runout and vibration, which is critical for achieving superior surface finishes and machining accuracy.
- Optimized High-Speed Capability: The lightweight phenolic resin cage reduces centrifugal forces, while the 25° contact angle offers an excellent balance between axial load capacity and limiting speed (35,000 rpm).
- Universal Matchability (SU): Bearings with the "SU" designation can be mounted in any combination (back-to-back, face-to-face, or tandem) to create a pre-loaded set, offering exceptional design flexibility.
- Pre-Lubricated & Ready-to-Install: The bearing is supplied lubricated and pre-set, simplifying installation and ensuring immediate, reliable performance.
71812 ACD/P4DGA Bearing Typical Application Areas
This bearing is ideally suited for high-performance applications requiring precision and speed, such as:
- Machine Tool Spindles (milling, grinding, and turning centers)
- High-Frequency Machining Spindles
- Precision Grinding Spindles
- High-Speed Robotic Drives
- Medical and Dental Equipment Spindles
