71918 CE/HCP4AQBCA
Hybrid Ceramic Super Precision Bearings
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Part No.
Part No.
71918 CE/HCP4AQBCA
Basic Information
System of measurement
Metric
Weight
1.84 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
72 mm
Width tolerance
-0.2mm to 0
Contact angle
15 °
Ball & Washer Dimensions
Ball diameter
11.112 mm
Ball quantity
24
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
18135 lbf
Radial static load rating
21712 lbf
Limiting speed
15 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
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 CE/HCP4AQBCA Bearing Product Overview & Core Advantages
The 71918 CE/HCP4AQBCA is a high-precision quadruplex angular contact ball bearing designed for applications demanding exceptional rigidity and accuracy. This metric system bearing features a back-to-back (QBC) matched arrangement of four bearings, enabling it to withstand combined radial and axial loads from multiple directions simultaneously. Manufactured to a P4A tolerance class and equipped with ceramic balls and a phenolic cage, it is engineered for high-speed operation up to 15,000 rpm, offering superior performance in the most demanding precision machinery.
71918 CE/HCP4AQBCA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 71918 | Basic bearing series and size designation (90mm bore, 125mm OD, 72mm width). |
| CE | Contact angle of 15°. |
| HC | Hybrid Ceramic: Signifies the use of ceramic balls for reduced friction, higher speed capability, and longer service life. |
| P4A | The tolerance class, indicating very high precision with enhanced running accuracy requirements. |
| QBC | Quadruplex Back-to-Back arrangement. This denotes a matched set of four bearings, pre-configured in a back-to-back orientation to provide high moment stiffness and stability. |
71918 CE/HCP4AQBCA Bearing Structural Features & Performance Benefits
- Exceptional Rigidity and Load Capacity: The quadruplex back-to-back (QBC) arrangement creates a highly rigid bearing system capable of supporting significant combined loads (radial and axial) and resisting overturning moments, making it ideal for applications requiring high positional accuracy.
- Superior High-Speed Performance: The combination of ceramic balls (lower density, reduced centrifugal force) and a lightweight phenolic cage significantly lowers friction and inertial forces, enabling stable operation at the high limiting speed of 15,000 rpm.
- High Precision Operation: Manufactured to P4A tolerance class with an extra light preload (Class A), this bearing ensures minimal runout and precise rotational performance, critical for machine tool spindles and other precision equipment.
- Optimized for Demanding Environments: The open seal type allows for optimal lubrication management in controlled environments, while the standard lubrication and chrome steel rings provide reliable performance within a temperature range of -30°C to 110°C.
71918 CE/HCP4AQBCA Bearing Typical Application Areas
This bearing is specifically designed for high-end industrial applications where precision, speed, and rigidity are paramount. Key sectors include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Articulated arms and high-accuracy positioning systems.
- Aerospace & Defense: Gyroscopes, radar systems, and other critical navigation equipment.
- High-Frequency Motors and Spindles: Where maximum rotational accuracy and speed are required.
