71907 CD/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71907 CD/HCP4ADGA
Basic Information
System of measurement
Metric
Weight
0.14 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
35 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
55 mm
Outside diameter tolerance
-0.004mm to 0
Width
20 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
5.556 mm
Ball quantity
21
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
3578 lbf
Radial static load rating
2902 lbf
Limiting speed
56 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Universal Matchable (SU)
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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71907 CD/HCP4ADGA Bearing Product Overview & Core Advantages
The 71907 CD/HCP4ADGA is a super-precision angular contact ball bearing designed for the most demanding high-speed and high-rigidity applications. As part of a universally matchable (SU) set, it excels in machine tool spindles and other precision equipment where exceptional rotational accuracy and dimensional stability are paramount. Its core advantages include the ability to accommodate combined radial and axial loads simultaneously, outstanding high-speed performance enabled by its phenolic cage and ceramic balls, and superior operational reliability due to its P4A tolerance class and pre-lubrication.
71907 CD/HCP4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71907 | Bearing series and size designation (35mm bore, 55mm OD, 20mm width). |
| CD | Indicates a 15° contact angle and specific internal design optimized for high-speed operation. |
| HC | Hybrid Ceramic: Denotes the use of ceramic balls, which reduce centrifugal forces, lower operating temperatures, and extend service life. |
| P4A | The tolerance class, signifying extremely tight dimensional and running accuracy standards superior to ABEC 7. |
| DGA | Universal Matchable (SU): The bearing is supplied as one of a pair of two bearings (SU arrangement) that can be mounted in either a DB or DF configuration without pre-load loss. |
71907 CD/HCP4ADGA Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces weight and inertia, enabling higher limiting speeds (56,000 rpm) and providing superior resistance to wear and thermal degradation.
- Phenolic Resin Cage: The lightweight and robust phenolic cage is ideal for high-speed applications, offering excellent dimensional stability and smooth operation with minimal friction.
- 15° Contact Angle & Universal Matchability (SU): The 15° contact angle provides an optimal balance between radial and axial load capacity. The universal matchable (SU) design allows for simplified mounting and pre-load control in duplex pairs, ensuring maximum system rigidity and accuracy.
- Extra Light Preload (Class A): Supplied with a minimal preload, which eliminates internal clearance and enhances shaft positioning accuracy without generating excessive heat, making it perfect for high-precision spindles.
- Super-Precision P4A Tolerances: Manufactured to the strictest P4A tolerance class, this bearing guarantees exceptional runout and rotational accuracy for applications requiring the highest levels of precision.
71907 CD/HCP4ADGA Bearing Typical Application Areas
This bearing is engineered for high-performance machinery where speed, precision, and rigidity are non-negotiable. Key application areas include:
- Machine Tool Spindles: High-speed machining centers, grinding spindles, and milling spindles.
- Precision Instrumentation: High-frequency spindles for PCB drilling and precision measuring equipment.
- High-Speed Motors and Drives: Servo motors and turbo-molecular pumps.
- Aerospace and Defense Systems: Gyroscopes and navigation systems requiring utmost reliability.
