71804 CD/HCP4QBCC
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71804 CD/HCP4QBCC
Basic Information
System of measurement
Metric
Weight
0.068 kg
Tolerance class
P4
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
20 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
32 mm
Outside diameter tolerance
-0.004mm to 0
Width
28 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
3.175 mm
Ball quantity
17
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
2272 lbf
Radial static load rating
2385 lbf
Limiting speed
100.5 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Quadruplex Back-to-Back (QBC)
Number of bearings in matched set
4
Universal matching bearing
No (Standard)
Preload
Moderate / Class C
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
Price available upon request.
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71804 CD/HCP4QBCC Bearing Product Overview & Core Advantages
The 71804 CD/HCP4QBCC is a precision angular contact ball bearing designed for the most demanding high-performance applications. As part of a Quadruplex Back-to-Back (QBC) matched set, this bearing delivers exceptional system rigidity and stability. Its ceramic ball construction enables superior high-speed performance and reduced operational friction. Preloaded to Moderate / Class C, it is optimized to handle significant combined loads (radial and axial) simultaneously, making it an ideal choice for spindles and other precision machinery requiring maximum accuracy and reliability.
71804 CD/HCP4QBCC Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71804 | Basic bearing designation, indicating a metric, 20 mm bore diameter. |
| CD | Indicates a 15° contact angle, optimized for high-speed operation and combined load capacity. |
| HC | Signifies the use of Hybrid Ceramic balls (Silicon Nitride), which reduce weight and friction for higher speeds and longer life. |
| P4 | Denotes a high-precision tolerance class, ensuring extremely tight dimensional and running accuracy. |
| QBCC | Specifies the bearing is part of a Quadruplex Back-to-Back (QBC) matched set with Moderate (C) preload. |
71804 CD/HCP4QBCC Bearing Structural Features & Performance Benefits
- Unmatched Rigidity and Stability: The Quadruplex Back-to-Back (QBC) arrangement of four bearings creates an exceptionally rigid bearing system, crucial for applications with high moment loads and where minimal shaft deflection is required.
- Superior High-Speed Capability: The combination of hybrid ceramic balls and a lightweight phenolic cage significantly reduces centrifugal forces and operating temperature, allowing for a high limiting speed of 100,500 rpm.
- High Load Capacity: The 15° contact angle and precision construction enable the bearing to effectively support substantial combined radial and axial loads.
- Precision and Longevity: Manufactured to P4 tolerance with a moderate preload, this bearing ensures smooth, precise rotation with minimal runout and extended service life, even under continuous high-speed operation.
71804 CD/HCP4QBCC Bearing Typical Application Areas
This bearing is engineered for high-end applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- High-Frequency Machine Tool Spindles
- Precision Grinding Spindles
- High-Speed Motors and Drives
- Aerospace and Defense Actuators
- Semiconductor Manufacturing Equipment
