71812 ACD/P4DBB
71800 Series Super Precision Angular Contact Ball Bearings
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Part No.
Part No.
71812 ACD/P4DBB
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
Duplex Back-to-Back (DB)
Number of bearings in matched set
2
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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71812 ACD/P4DBB Bearing Product Overview & Core Advantages
The 71812 ACD/P4DBB is a precision duplex angular contact ball bearing designed for applications demanding exceptional rigidity and rotational accuracy. This metric series bearing features a back-to-back (DB) matched arrangement, enabling it to withstand combined radial and axial loads from both directions simultaneously. Manufactured to a P4 tolerance class with a light preload (Class B), it delivers high running accuracy and stability, making it ideal for high-speed spindles and other high-precision machinery.
71812 ACD/P4DBB Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71812 | Basic bearing designation indicating the size series and 60 mm bore diameter. |
| AC | Angular Contact design with a 25° contact angle for optimal axial load capacity. |
| D | Duplex (two bearings supplied as a matched set). |
| P4 | Indicates a high-precision tolerance class for superior running accuracy. |
| DBB | Specifies the Back-to-Back (DB) arrangement of the matched set, providing high moment rigidity. |
71812 ACD/P4DBB Bearing Structural Features & Performance Benefits
- High Rigidity & Stability: The duplex back-to-back (DB) configuration creates a wide effective spread, significantly increasing system rigidity and resistance to moment loads, which is critical for maintaining precision under heavy cutting forces.
- Superior Load Capacity: With a 25° contact angle and a dynamic load rating of 4680 lbf, this bearing is engineered to handle significant combined radial and axial loads efficiently.
- Optimized High-Speed Performance: The lightweight phenolic resin cage ensures smooth operation and reduced centrifugal forces, contributing to a high limiting speed of 35,000 rpm. The open design and factory lubrication facilitate optimal heat dissipation.
- Precision Engineering: Manufactured to P4 tolerance standards with tight dimensional control on the bore diameter, outside diameter, and width, this bearing guarantees minimal runout and vibration for ultra-precise applications.
71812 ACD/P4DBB Bearing Typical Application Areas
This bearing is specifically designed for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: For PCB drilling, semiconductor manufacturing, and other fine machining processes.
- High-Frequency Motors: Spindles for routers and other high-RPM electric motors.
- Medical Equipment: High-speed drills and dental handpieces.
- Aerospace & Defense: Gyroscopes, radar systems, and other precision instrumentation.
