S71928 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
S71928 CDGA/HCP4A
Basic Information
System of measurement
Metric
Weight
1.4 kg
Tolerance class
P4A
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
140 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
190 mm
Outside diameter tolerance
-0.004mm to 0
Width
24 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
15.875 mm
Ball quantity
29
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
21510 lbf
Radial static load rating
26100 lbf
Limiting speed
11 X 1000 rpm
Lubrication
Grease
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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S71928 CDGA/HCP4A Bearing Product Overview & Core Advantages
The S71928 CDGA/HCP4A is a precision angular contact ball bearing designed for applications demanding exceptional accuracy and high-speed performance. As a single bearing from a universally matchable (SU) set of two, it is engineered to accommodate combined loads—simultaneously handling radial loads and axial loads in one direction. Its construction features a P4A tolerance class for superior dimensional precision and running accuracy, an extra light (Class A) preload for minimal deflection, and a sealed design for reliable, long-term operation. This bearing is ideal for high-rigidity, high-reliability applications where precision and speed are critical.
S71928 CDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
The model number S71928 CDGA/HCP4A is decoded as follows:
- S7: Indicates a high-precision bearing series, typically with enhanced design for stiffness and speed.
- 1928: Specifies the size series; 19 for the medium series and 28 for a 140 mm bore diameter.
- CD: Denotes a 15° contact angle, optimized for high-speed applications and combined loads.
- GA: Signifies a light preload (Class A), reducing play and improving system rigidity.
- HC: Refers to the hybrid ceramic construction, featuring ceramic balls for reduced weight, lower friction, and higher speed capability.
- P4A: Represents the tolerance class, indicating very tight dimensional and running accuracy standards beyond ABEC 7.
S71928 CDGA/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity & Precision: The P4A tolerance class and extra light preload ensure minimal runout and high system stiffness, critical for precision machining and positioning.
- Superior Load Capacity: The 15° contact angle and robust design enable it to handle significant combined radial and axial loads efficiently.
- Exceptional High-Speed Performance: The hybrid ceramic construction (ceramic balls and steel rings) reduces centrifugal forces and friction, allowing for a high limiting speed of 11,000 rpm. The phenolic cage offers low weight and excellent performance at high speeds.
- Long Service Life & Reliability: The sealed design and pre-applied grease lubrication protect against contamination and provide consistent performance within a temperature range of -30°C to 110°C, reducing maintenance needs.
S71928 CDGA/HCP4A Bearing Typical Application Areas
This bearing is ideally suited for high-performance applications, including:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers requiring precision and rigidity.
- High-Speed Motors and Spindles: In applications where low friction and high rotational speeds are paramount.
- Precision Robotics: For robotic arm joints and actuators demanding accuracy and high dynamic response.
- Aerospace and Defense Systems: In gyroscopes, navigation systems, and other critical components.
- Medical Equipment: Such as high-speed dental handpieces and imaging device rotors.
