S71905 CD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
S71905 CD/HCP4A
Basic Information
System of measurement
Metric
Weight
0.038 kg
Tolerance class
P4 (ABEC-7)
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
25 mm
Bore diameter tolerance
-0.005mm to 0
Outside diameter
42 mm
Outside diameter tolerance
-0.006mm to 0
Width
9 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
4.762 mm
Ball quantity
18
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
1521 lbf
Radial static load rating
900 lbf
Limiting speed
45 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:
$ 212.04
/ each
In Stock
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S71905 CD/HCP4A Bearing Product Overview & Core Advantages
The S71905 CD/HCP4A is a high-precision angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. This single-row bearing features a 15° contact angle and is supplied with a preload, delivering superior running accuracy and high rigidity. Its compact design, with a 25 mm bore and 9 mm width, makes it ideal for space-constrained, high-speed spindles. The combination of a ceramic ball material and a phenolic cage enables outstanding high-speed performance and thermal stability, making it a top-tier solution for precision machinery.
Model Code Breakdown
The S71905 CD/HCP4A model number reveals its specific technical features:
- S7: High-precision bearing series.
- 1905: Standard size designation (19mm series, 05 = 25mm bore).
- C: Specific internal design and 15° contact angle.
- D: Signifies a preload class.
- HC: Hybrid Ceramic, indicating the balls are made of ceramic while the rings are steel.
- P4: Denotes a P4 (ABEC-7) tolerance class, signifying ultra-high precision.
- A: Identifies a specific internal geometry and tolerance grouping.
S71905 CD/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity and Running Accuracy: The applied preload eliminates internal clearance, ensuring minimal deflection under load and exceptional positioning accuracy, which is critical for machining and precision instrumentation.
- Superior High-Speed Capability: The hybrid ceramic design with silicon nitride balls significantly reduces centrifugal forces and friction, while the lightweight phenolic resin cage offers excellent strength and guidance at the limiting speed of 45,000 rpm.
- Extended Service Life and Thermal Stability: Ceramic balls are harder, lighter, and more resistant to wear than steel. They also provide superior electrical insulation and operate effectively within a wide temperature range of -30° to 110 °C.
- Precision Engineering: Manufactured to a P4 tolerance class, this bearing ensures tight dimensional control on bore, outside diameter, and width for predictable and reliable performance in the most demanding applications.
S71905 CD/HCP4A Bearing Typical Application Areas
This bearing is specifically designed for high-performance applications where speed, precision, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and drilling spindles.
- Precision Robotics: Arm joints and high-accuracy servo motors.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and navigation equipment.
- Medical Equipment: High-speed dental handpieces and laboratory centrifuges.
- Semiconductor Manufacturing: Wafer handling robots and precision stages.
