71909 CD/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71909 CD/HCP4ADGA
Basic Information
System of measurement
Metric
Weight
0.24 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
45 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
68 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
6.35 mm
Ball quantity
23
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
4770 lbf
Radial static load rating
4275 lbf
Limiting speed
41 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
No drawings available at the moment, will be launched soon
Price:
$ 358.94
/ each
In Stock
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71909 CD/HCP4ADGA Bearing Product Overview & Core Advantages
The 71909 CD/HCP4ADGA is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and performance. This universally matchable (SU) bearing is part of a precisely matched pair (set of 2), enabling it to handle combined radial and axial loads simultaneously. Its construction with a ceramic ball and P4A super-precision tolerance class ensures low heat generation, high limiting speed capabilities, and outstanding operational reliability in high-speed, high-rigidity scenarios.
71909 CD/HCP4ADGA Bearing Model Code Explained, Specifications & Naming Convention
The model number 71909 CD/HCP4ADGA is decoded as follows:
- 71909: Basic series designation for a high-precision angular contact ball bearing with a 45mm bore.
- C: 15° nominal contact angle.
- D: High internal clearance/light preload designation.
- HC: Hybrid Ceramic - signifies the use of ceramic balls.
- P4A: Tolerance class equivalent to ABEC 7/ISO P4, with additional running accuracy requirements.
- A: Extra light preload (Class A).
- DGA: Universal Matchable (SU arrangement). Two bearings can be paired face-to-face, back-to-back, or in tandem.
71909 CD/HCP4ADGA Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces friction, heat generation, and wear. This enables higher limiting speeds (41,000 rpm), extended service life, and improved performance in lubricant-starved conditions.
- Super-Precision P4A Tolerance: Manufactured to the strictest dimensional and running accuracy standards, this bearing ensures minimal vibration and superior rotational precision for critical spindle applications.
- Phenolic Resin Cage: The lightweight and robust phenolic cage provides excellent guidance at high speeds, contributing to smooth operation and stability.
- Universal Matchability (SU): As a universally matchable bearing, it offers maximum flexibility in mounting configurations (DB, DF, DT) to optimize stiffness and handle complex combined loads.
- High Load Capacity: With a dynamic load rating of 4770 lbf and static load rating of 4275 lbf, it is engineered for rigorous application demands.
71909 CD/HCP4ADGA Bearing Typical Application Areas
This bearing is ideally suited for high-performance machinery where speed, precision, and reliability are paramount. Key applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy positioning systems.
- High-Frequency Motors and Spindles
- Aerospace & Defense Systems: Gyroscopes, navigation instruments, and auxiliary power units.
- Medical Equipment: Dental handpieces and laboratory centrifuges.
