71909 CD/HCP4A
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71909 CD/HCP4A
Basic Information
System of measurement
Metric
Weight
0.12 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
45 mm
Bore diameter tolerance
-0.006mm to 0
Outside diameter
68 mm
Outside diameter tolerance
-0.007mm to 0
Width
12 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° to 110 °C
Radial dynamic load rating
2925 lbf
Radial static load rating
2138 lbf
Limiting speed
36 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:
$ 353.76
/ each
In Stock
- Fast delivery
- Free shipping on orders over $200
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71909 CD/HCP4A Bearing Product Overview & Core Advantages
The 71909 CD/HCP4A is a high-precision angular contact ball bearing designed for demanding applications requiring exceptional rotational accuracy and rigidity. This single-row bearing features a 15° contact angle and is supplied with a preload, making it ideal for applications where minimal shaft deflection and high system stiffness are critical. Manufactured to P4 (ABEC-7) tolerance class, it guarantees superior running accuracy. The combination of a ceramic ball material and phenolic cage contributes to its high-speed capability, low friction, and extended service life.
71909 CD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| CD | Indicates a high-precision, duplex bearing arrangement with a specific preload and contact angle optimized for high rigidity. |
| HC | Signifies the use of Hybrid Ceramic balls, which are lighter and harder than steel, enabling higher speeds and reduced heat generation. |
| P4 | Denotes the tolerance class equivalent to ABEC-7, ensuring extremely tight dimensional and running accuracy for precision applications. |
| A | Specifies the contact angle of 15°, which is optimized for supporting combined loads with a higher thrust capacity. |
71909 CD/HCP4A Bearing Structural Features & Performance Benefits
- High Rigidity and Precision: The preloaded design and P4 tolerance class eliminate internal clearance, providing maximum system stiffness and precise shaft positioning, which is crucial for machine tool spindles.
- Superior High-Speed Performance: The hybrid ceramic balls reduce centrifugal forces and friction, while the lightweight phenolic cage ensures stability and low inertia, collectively enabling a high limiting speed of 36,000 rpm.
- Excellent Load Capacity: The 15° contact angle is engineered to efficiently handle combined radial and axial loads, with a dynamic load rating of 2925 lbf.
- Optimized for Longevity: The open design is lubricated for immediate operation. The ceramic balls are electrically resistant and less prone to wear, contributing to a longer operational life in challenging conditions.
71909 CD/HCP4A Bearing Typical Application Areas
This bearing is ideally suited for high-performance machinery where precision, speed, and rigidity are non-negotiable. Key applications include:
- Machine Tool Spindles: For high-speed milling, grinding, and turning centers.
- High-Frequency Spindles: In PCB drilling and precision engraving machines.
- Precision Instrumentation: Used in medical devices, optical scanners, and coordinate measuring machines.
- Advanced Robotics: For high-accuracy joints and actuators.
