71812 ACD/HCP4QBCBVK360
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71812 ACD/HCP4QBCBVK360
Basic Information
System of measurement
Metric
Weight
0.35 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
78 mm
Outside diameter tolerance
-0.004mm to 0
Width
40 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
7470 lbf
Radial static load rating
11925 lbf
Limiting speed
35 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Quadruplex Back-to-Back (QBC)
Number of bearings in matched set
4
Universal matching bearing
No (Standard)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
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71812 ACD/HCP4QBCBVK360 Bearing Product Overview & Core Advantages
The 71812 ACD/HCP4QBCBVK360 represents a premium precision quadruplex angular contact ball bearing set engineered for demanding applications. This metric system bearing is characterized by its ceramic balls and P4A super-precision tolerance class, delivering exceptional rotational accuracy and high-speed capability. Its core advantage lies in the Quadruplex Back-to-Back (QBC) matched arrangement, which provides extremely high rigidity and superior capacity to handle complex combined loads, including significant radial and axial forces from both directions. Preloaded to Light / Class B, this set ensures minimal runout and is ideal for high-reliability, high-performance systems.
71812 ACD/HCP4QBCBVK360 Bearing Model Code Explained, Specifications & Naming Convention
The model number 71812 ACD/HCP4QBCBVK360 provides detailed technical specifications through its suffixes:
- 71812: Basic bearing designation (60mm bore, 78mm OD, 40mm width).
- ACD: Angular Contact design with a 25° contact angle.
- HC: Denotes the use of Hybrid Ceramic balls (Silicon Nitride).
- P4: Identifies the P4A super-precision tolerance class.
- QBC: Specifies the bearing set is a Quadruplex Back-to-Back matched arrangement.
- BVK360: Indicates the bearings are pre-lubricated with a specific, high-performance grease suitable for the operational range.
71812 ACD/HCP4QBCBVK360 Bearing Structural Features & Performance Benefits
- Unmatched Rigidity & Load Capacity: The Quadruplex Back-to-Back (QBC) configuration creates an exceptionally stiff bearing system, capable of withstanding heavy combined radial and axial loads and resisting moment loads effectively.
- High-Speed & Thermal Stability: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic cage significantly lowers friction and allows for a high limiting speed of 35,000 rpm. This hybrid construction also offers superior thermal stability.
- Precision Performance: Manufactured to P4A tolerance class and supplied as a pre-matched set, these bearings ensure minimal runout and consistent, predictable performance critical for precision applications.
- Optimized Preload & Longevity: The Light / Class B preload is factory-set to eliminate internal clearance, providing precise shaft positioning and smooth operation without the need for on-site adjustment.
71812 ACD/HCP4QBCBVK360 Bearing Typical Application Areas
This high-performance bearing set is ideally suited for the most demanding sectors and machinery, including:
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Robotics and Automation Arms
- Advanced Aerospace & Defense Systems
- Medical and Dental Equipment Spindles
