71956 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71956 ACD/HCP4A
Basic Information
System of measurement
Metric
Weight
11.1 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
280 mm
Bore diameter tolerance
-0.013mm to 0
Outside diameter
380 mm
Outside diameter tolerance
-0.015mm to 0
Width
46 mm
Width tolerance
-0.24mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
30.162 mm
Ball quantity
31
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
62100 lbf
Radial static load rating
96750 lbf
Limiting speed
5 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:
$ 8152.32
/ each
In Stock
- Fast delivery
- Free shipping on orders over $200
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71956 ACD/HCP4A Bearing Product Overview & Core Advantages
The 71956 ACD/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. This single-row bearing is distinguished by its 25° contact angle and P4 (ABEC-7) tolerance class, ensuring superior running accuracy. A key advantage is its ability to accommodate high combined loads, efficiently handling both substantial radial and unidirectional axial loads simultaneously. The use of ceramic balls and a phenolic cage contributes to its capabilities as a high-speed bearing, offering reduced friction, lower operating temperatures, and extended service life. It is supplied pre-lubricated and is available with a preload for enhanced system rigidity.
71956 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 71956 ACD/HCP4A provides detailed technical specifications through its suffixes:
- 71956: Basic designation indicating a metric, single-row angular contact ball bearing with a 280mm bore.
- ACD: Signifies a 25° contact angle and a specific internal design optimized for high rigidity and precise operation.
- H: Indicates that the bearing is supplied with a preload for increased stiffness and reduced axial/radial play.
- C: Denotes that the bearing's internal radial clearance is less than Normal (CN) group.
- P4: Specifies the tolerance class equivalent to ABEC-7, denoting very high precision in dimensions and running accuracy.
- A: Indicates that the bearing's outer ring has a specific tolerance for optimized mounting.
71956 ACD/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The 25° contact angle and P4 precision provide excellent guidance and minimize deflection under load, making it ideal for high-rigidity applications. The optional preload further enhances system stiffness.
- Superior Load Capacity: Designed to sustain high radial dynamic load ratings (62,100 lbf) and static load ratings (96,750 lbf), this bearing reliably handles significant combined loads.
- Enhanced High-Speed Performance: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic resin cage allows for a high limiting speed of 5,000 rpm, reducing friction and heat generation.
- Optimized Material Selection: The chrome steel rings provide high strength and durability, while the ceramic balls offer electrical insulation, corrosion resistance, and a longer operational lifespan.
71956 ACD/HCP4A Bearing Typical Application Areas
This high-precision angular contact ball bearing is ideally suited for applications where accuracy, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- Precision Spindles: Used in PCB drilling, semiconductor manufacturing, and other high-accuracy machining processes.
- High-Frequency Motors and Spindles: Where low friction and high rotational accuracy are critical.
- Aerospace and Defense Systems: In gyroscopes, radar systems, and other precision instrumentation.
- Medical Equipment: Such as high-speed dental handpieces and imaging device rotors.
