71968 ACDMA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71968 ACDMA/HCP4A
Basic Information
System of measurement
Metric
Weight
21.6 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
340 mm
Bore diameter tolerance
-0.016mm to 0
Outside diameter
460 mm
Outside diameter tolerance
-0.02mm to 0
Width
56 mm
Width tolerance
-0.3mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
38.1 mm
Ball quantity
29
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
81900 lbf
Radial static load rating
144000 lbf
Limiting speed
4 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
Preload
Available
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
Price:
$ 12398.32
/ each
In Stock
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71968 ACDMA/HCP4A Bearing Product Overview & Core Advantages
The 71968 ACDMA/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional rotational accuracy and rigidity. This single-row bearing is distinguished by its 25° contact angle and is supplied with a preload, ensuring minimal axial and radial play for superior system stability. Its construction with a phenolic cage and ceramic balls contributes to high-speed capability, reduced weight, and extended service life, making it an ideal solution for high-rigidity and high-speed spindle systems.
71968 ACDMA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 71968 ACDMA/HCP4A provides detailed technical specifications through its suffixes:
- 71968: Basic bearing series and size designation (340mm bore, 460mm OD).
- AC: Angular Contact design, optimized for combined loads.
- D: Signifies a high contact angle of 25°.
- MA: Indicates a phenolic (resin) cage.
- HCP4A: Denotes the P4 (ABEC-7) tolerance class and a specific internal preload grouping for matched performance.
71968 ACDMA/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The P4 tolerance class guarantees extremely tight dimensional and running accuracy. The application of a factory-set preload eliminates internal clearance, resulting in a very stiff bearing arrangement that is critical for applications sensitive to deflection.
- Superior High-Speed Performance: The combination of a lightweight phenolic cage and low-density ceramic balls significantly reduces centrifugal forces, allowing for higher limiting speeds (4,000 rpm) and lower operating temperatures compared to all-steel designs.
- Enhanced Load Capacity: The 25° contact angle is optimized to handle substantial combined loads, effectively supporting both radial and axial forces simultaneously. This is evidenced by its high dynamic (81,900 lbf) and static (144,000 lbf) load ratings.
- Extended Service Life: Ceramic balls are harder, smoother, and more corrosion-resistant than steel, leading to reduced wear. They are also electrically insulating, preventing electrical erosion. The phenolic cage offers excellent dimensional stability and operates effectively at high speeds.
71968 ACDMA/HCP4A Bearing Typical Application Areas
This bearing is specifically designed for high-performance machinery where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling machines and precision engraving equipment.
- High-Frequency Motors: Spindles for electric motors operating at very high RPMs.
- Aerospace & Defense: Gyroscopes, radar systems, and other critical rotating assemblies.
