71908 CD/HCP4A
Hybrid Ceramic Super Precision Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
71908 CD/HCP4A
Basic Information
System of measurement
Metric
Weight
0.1 kg
Tolerance class
P4 (ABEC-7)
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
40 mm
Bore diameter tolerance
-0.006mm to 0
Outside diameter
62 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
21
Performance
Temperature range
-30° to 110 °C
Radial dynamic load rating
2790 lbf
Radial static load rating
1912 lbf
Limiting speed
40 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:
$ 314.06
/ each
In Stock
- Fast delivery
- Free shipping on orders over $200
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
71908 CD/HCP4A Bearing Product Overview & Core Advantages
The 71908 CD/HCP4A is a single-row angular contact ball bearing engineered for applications demanding high precision and superior rotational accuracy. Positioned in the P4 (ABEC-7) tolerance class, it is designed to handle significant axial loads in one direction while supporting moderate radial loads. Its core advantages include exceptional high-speed capability with a limiting speed of 40,000 rpm, enabled by its ceramic balls and phenolic cage, and the availability of preload for enhanced system rigidity and reduced vibration.
71908 CD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
The model designation "71908 CD/HCP4A" provides detailed technical specifications:
- 71908: Denotes the bearing series and size (40mm bore, 62mm OD, 12mm width).
- C: Indicates a 15° contact angle, optimized for high-speed applications with a primary axial load capacity.
- D: Signifies that the bearing is supplied with a specific preload for immediate high-stiffness performance.
- HC: Stands for Hybrid Ceramic, specifying that the rolling elements are ceramic balls, which reduce centrifugal forces, lower operating temperatures, and enable higher speeds.
- P4: Identifies the tolerance class equivalent to ABEC-7, ensuring ultra-precise dimensions and run-out for critical applications.
- A: Indicates an optimized internal design for enhanced performance and load distribution.
71908 CD/HCP4A Bearing Structural Features & Performance Benefits
- Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls significantly reduces weight and inertia, minimizes friction, and provides superior performance at high speeds. This construction also offers benefits in electrically sensitive environments.
- Phenolic Resin Cage: The lightweight and robust phenolic cage ensures excellent dimensional stability and low friction at high rotational speeds, contributing directly to the bearing's 40,000 rpm limiting speed.
- High-Precision & Preload: Manufactured to P4 tolerance class, this bearing guarantees minimal runout and high running accuracy. The application of preload (D) increases system rigidity, improves shaft guidance, and extends the system's natural frequency, which is critical for machining accuracy.
- Optimized Load Capacity: With a 15° contact angle and a dynamic load rating of 2790 lbf, it is expertly designed to handle high axial loads and combined (axial and radial) loads efficiently.
71908 CD/HCP4A Bearing Typical Application Areas
This high-precision, high-speed angular contact bearing is ideally suited for demanding applications, including:
- Machine Tool Spindles: For high-speed milling, grinding, and drilling spindles requiring extreme precision and rigidity.
- Precision Robotics: In robot arm joints and spindle drives where high accuracy and rapid movement are essential.
- High-Frequency Motors and Spindles: Used in PCB drilling spindles and dental handpieces.
- Aerospace & Defense Systems: In gyroscopes, navigation systems, and other instrumentation requiring reliable high-speed operation.
