S71904 CEGB/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
S71904 CEGB/HCP4A
Basic Information
System of measurement
Metric
Weight
0.031 kg
Tolerance class
P4A
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
20 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
37 mm
Outside diameter tolerance
-0.004mm to 0
Width
9 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
14
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
1112 lbf
Radial static load rating
531 lbf
Limiting speed
75 X 1000 rpm
Lubrication
Grease
Matched arrangement
Single
Number of bearings in matched set
4
Universal matching bearing
Universal Matchable (SU)
Preload
Light / Class B
Materials
Ring material
Chrome Steel
Ball material
Ceramic
Cage material
Phenolic
Technical Drawings
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S71904 CEGB/HCP4A Bearing Product Overview & Core Advantages
The S71904 CEGB/HCP4A is a super-precision angular contact ball bearing designed for the most demanding high-speed and high-rigidity applications. As a single bearing from a universally matchable (SU) set, it excels in applications requiring exceptional rotational accuracy and stability. Its core advantages stem from its P4A tolerance class, ceramic ball construction, and light preload (Class B), enabling it to handle combined radial and axial loads simultaneously with minimal heat generation and friction at extreme speeds.
S71904 CEGB/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
The S71904 CEGB/HCP4A model code provides detailed technical specifications:
- S7: Denotes a series of high-precision, high-speed angular contact ball bearings.
- 1904: Standard bore (20 mm) and outside diameter (37 mm) designation.
- C: Indicates a 15° contact angle, optimized for high-speed operation.
- E: Signifies a reinforced (high-capacity) design with an optimized internal geometry.
- G: Specifies pre-greased lubrication.
- B: Indicates the specific light preload (Class B).
- HCP4A: Defines the tolerance class P4A, representing extremely tight dimensional and running accuracy superior to ABEC 7.
S71904 CEGB/HCP4A Bearing Structural Features & Performance Benefits
- High-Speed & Low Friction Performance: The combination of silicon nitride ceramic balls and a lightweight phenolic resin cage significantly reduces centrifugal forces and friction, enabling a high limiting speed of 75,000 rpm. This design minimizes heat buildup and energy consumption.
- High Rigidity & Accuracy: Manufactured to a P4A super-precision tolerance with a light preload, this bearing provides exceptional running accuracy and system rigidity, minimizing deflection under load for superior performance in precision spindles.
- Extended Service Life & Reliability: Ceramic balls are harder, lighter, and more resistant to wear and corrosion than steel, leading to a dramatically longer service life. The sealed and pre-greased design protects against contamination and ensures immediate, reliable operation.
- Thermal Stability: Ceramic balls have a lower coefficient of thermal expansion than steel, helping to maintain stable preload and performance across the operating temperature range of -30°C to 110°C.
S71904 CEGB/HCP4A Bearing Typical Application Areas
This bearing is engineered for high-performance machinery where speed, precision, and reliability are critical. Key applications include:
- Machine Tool Spindles: High-speed milling, drilling, and grinding spindles.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- High-Frequency Motors & Spindles: Motors for PCB drilling and dental handpieces.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and auxiliary power units.
- Semiconductor Manufacturing Equipment: Wafer handling robots and precision stages.
