S71904 CDTP/HCP4B
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
S71904 CDTP/HCP4B
Basic Information
System of measurement
Metric
Weight
0.033 kg
Tolerance class
P4 (ABEC-7)
Seal type
Sealed
For load direction
Angular Contact
Main Dimensions
Bore diameter
20 mm
Bore diameter tolerance
-0.005mm to 0
Outside diameter
37 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
15
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
1361 lbf
Radial static load rating
720 lbf
Limiting speed
53 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:
$ 188.51
/ each
In Stock
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S71904 CDTP/HCP4B Bearing Product Overview & Core Advantages
The S71904 CDTP/HCP4B 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 20 mm bore and 9 mm width, makes it ideal for space-constrained, high-speed spindles. The combination of a ceramic ball material and P4 (ABEC-7) tolerance class ensures low heat generation, minimal thermal expansion, and extended service life under high-speed operation.
S71904 CDTP/HCP4B Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| S | Denotes a bearing with a super-precision tolerance class. |
| 71904 | The basic bearing series designation, indicating a high-precision angular contact bearing with a 20mm bore, 37mm OD, and 9mm width. |
| C | Specifies a 15° contact angle, optimized for high-speed applications requiring high rigidity. |
| D | Indicates the bearing is supplied with a preload for enhanced stiffness and rotational accuracy. |
| TP | Signifies the cage material is phenolic resin, offering low weight and excellent performance at high speeds. |
| HC | Denotes the use of hybrid ceramic balls (silicon nitride), which reduce friction, heat, and wear. |
| P4 | The tolerance class is equivalent to ABEC-7, indicating extremely tight dimensional and running accuracy tolerances. |
| B | Indicates the bearing is pre-lubricated with a specific high-performance grease. |
S71904 CDTP/HCP4B Bearing Structural Features & Performance Benefits
- High Rigidity and Running Accuracy: The application of a preload eliminates internal clearance, resulting in significantly increased system stiffness and superior running accuracy, which is critical for machining precision.
- Superior High-Speed Performance: The hybrid ceramic balls are lighter and harder than steel, reducing centrifugal force and friction. Combined with the lightweight phenolic resin cage, this allows the bearing to achieve a high limiting speed of 53,000 rpm with minimal heat generation.
- Extended Service Life: Ceramic balls are electrically resistant and have a lower coefficient of thermal expansion than steel, leading to more stable preload conditions and reduced wear, especially in challenging thermal environments.
- Sealed and Lubricated for Life: As a sealed and pre-lubricated unit, the bearing is protected from contamination and is designed for maintenance-free operation throughout its service life within the specified temperature range.
S71904 CDTP/HCP4B Bearing Typical Application Areas
This bearing is specifically designed for high-performance machinery where precision, speed, and rigidity are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling, engraving, and high-frequency motor spindles.
- Medical Equipment: High-speed dental handpieces and surgical tools.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
