71911 CBGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71911 CBGA/HCP4A
Basic Information
System of measurement
Metric
Weight
0.17 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
55 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
80 mm
Outside diameter tolerance
-0.004mm to 0
Width
13 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
5.556 mm
Ball quantity
28
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
2239 lbf
Radial static load rating
1834 lbf
Limiting speed
39 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Single
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
Ceramic
Cage material
Phenolic
Technical Drawings
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In Stock
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71911 CBGA/HCP4A Bearing Product Overview & Core Advantages
The 71911 CBGA/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and reliability. This single bearing features an Extra Light (A) preload and is manufactured to P4A tolerance class, ensuring minimal runout and superior performance. Its 15° contact angle is optimized for handling combined loads, particularly high-speed applications where rigidity and precision are paramount. The use of ceramic balls and a phenolic cage contributes to its high-speed capabilities, reduced weight, and extended service life.
71911 CBGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
The model number 71911 CBGA/HCP4A breaks down as follows:
- 71911: Basic bearing series, indicating a light series, single-row angular contact ball bearing with a 55mm bore.
- C: Denotes a 15° contact angle.
- B: Indicates a 40° contact angle (Note: This conflicts with the provided 15° specification. The "C" suffix is the primary designator for 15°).
- GA: Signifies Universal Matchable (SU) bearings supplied in a matched set of 2, pre-loaded for immediate installation.
- HCP4A: Defines the tolerance class P4A, representing very high precision for the bearing's width and running accuracy.
71911 CBGA/HCP4A Bearing Structural Features & Performance Benefits
- High Precision & Rigidity: Manufactured to P4A tolerance class with an Extra Light preload (Class A), this bearing delivers exceptional running accuracy and system stiffness, minimizing deflection under load.
- High-Speed Performance: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic resin cage enables a high limiting speed of 39,000 rpm. The 15° contact angle further optimizes it for rapid rotation.
- Superior Load Capacity: As an angular contact bearing, it efficiently supports combined radial and axial loads. The universal matching (SU) design allows two bearings to be paired for optimal load distribution and moment load capacity.
- Pre-Lubricated & Ready-to-Install: The bearing is supplied lubricated and as a matched set, ensuring consistent performance and simplifying the assembly process for high-precision machinery.
71911 CBGA/HCP4A Bearing Typical Application Areas
This precision bearing is ideally suited for applications where high speed, accuracy, and rigidity are critical. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy positioning systems.
- High-Frequency Spindles: PCB drilling and routing machines.
- Medical Equipment: Dental handpieces and laboratory centrifuges.
- Aerospace Systems: Gyroscopes and auxiliary power units.
