71918 CD/HCP4ATBTA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71918 CD/HCP4ATBTA
Basic Information
System of measurement
Metric
Weight
1.42 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
90 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
125 mm
Outside diameter tolerance
-0.004mm to 0
Width
54 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
11.112 mm
Ball quantity
26
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
22725 lbf
Radial static load rating
34425 lbf
Limiting speed
15 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Triplex Back-to-Back (TBT)
Number of bearings in matched set
3
Universal matching bearing
No (Standard)
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
In Stock
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71918 CD/HCP4ATBTA Bearing Product Overview & Core Advantages
The 71918 CD/HCP4ATBTA is a precision angular contact ball bearing configured as a Triplex Back-to-Back (TBT) matched set. Engineered for the most demanding applications, this bearing set delivers exceptional rotational accuracy and system rigidity. Its primary advantage lies in its ability to handle combined loads (radial and axial) simultaneously while maintaining high-speed performance and thermal stability, making it ideal for ultra-precise spindles and machinery.
71918 CD/HCP4ATBTA Bearing Model Code Explained, Specifications & Naming Convention
| Suffix Code | Technical Meaning |
|---|---|
| CD | 15° contact angle and specific internal design for high-precision applications. |
| HC | Hybrid Ceramic: Indicates the use of ceramic balls for reduced friction, higher speed capability, and non-conductive properties. |
| P4A | Specifies a high-precision tolerance class (superior to ABEC 7), ensuring extremely tight dimensional and running accuracy. |
| TBT | Triplex Back-to-Back: Denotes a set of three bearings matched and preloaded in a back-to-back arrangement to maximize system stiffness and moment load capacity. |
| A | Specifies an Extra Light preload within the matched set, optimizing for high-speed operation with minimal friction. |
71918 CD/HCP4ATBTA Bearing Structural Features & Performance Benefits
- Unmatched Rigidity & Load Capacity: The Triplex Back-to-Back (TBT) configuration creates an exceptionally rigid bearing system, capable of withstanding heavy combined loads and significant moment loads. This is critical for applications requiring minimal shaft deflection.
- High-Speed & Low-Friction Performance: The combination of ceramic balls and a lightweight phenolic cage significantly reduces centrifugal forces and friction, enabling a high limiting speed of 15,000 rpm. The hybrid ceramic design also offers electrical insulation.
- Precision & Accuracy: Manufactured to P4A tolerance class, this bearing ensures ultra-precise running accuracy, low noise, and minimal vibration, which is essential for achieving superior surface finishes and machining accuracy.
- Optimized Preload: The matched set comes with a factory-applied Extra Light (A) preload, eliminating internal clearance and ensuring consistent performance without the need for complex on-site adjustment.
71918 CD/HCP4ATBTA Bearing Typical Application Areas
This high-performance precision bearing set is specifically designed for advanced machinery requiring the highest levels of accuracy and speed.
- High-Frequency CNC Spindles for milling, grinding, and drilling
- Precision Machine Tool Main Spindles
- High-Speed Robotics and automation arms
- Advanced Medical Equipment spindles
- Aerospace test equipment and instrumentation
