71918 CE/HCP4ADBA
Hybrid Ceramic Super Precision Bearings
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71918 CE/HCP4ADBA Bearing Product Overview & Core Advantages
The 71918 CE/HCP4ADBA is a high-precision duplex angular contact ball bearing designed for demanding applications requiring exceptional accuracy and rigidity. This matched back-to-back (DB) arrangement provides superior stability and can accommodate combined radial and axial loads from both directions. Manufactured to P4A tolerance class, it delivers extremely tight running accuracy, making it ideal for high-speed spindles and other precision machinery where high rigidity
71918 CE/HCP4ADBA Bearing Model Code Explained, Specifications & Naming Convention
- 71918: Basic series designation, indicating a 90mm bore, 125mm OD, 36mm width angular contact bearing.
- CE: Indicates a 15° contact angle, optimized for high-speed operation with moderate axial load capacity.
- HC: Signifies the use of Hybrid Ceramic balls (Silicon Nitride), offering reduced weight, lower friction, and extended service life at high speeds.
- P4A: Denotes an ultra-precision tolerance class exceeding ABEC 7/ISO P4 standards, ensuring exceptional dimensional and running accuracy.
- A: Specifies an Extra Light preload within the matched set, minimizing starting torque and optimizing performance for very high-speed applications.
- DB: Indicates the bearings are supplied as a Duplex Back-to-Back matched pair, providing high moment rigidity.
- Open / Lubricated: The bearing is supplied open (unsealed) and pre-lubricated for initial operation.
71918 CE/HCP4ADBA Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls significantly reduces centrifugal forces, lowers operating temperature, and enables higher limiting speeds (15,000 rpm). This construction also provides enhanced durability and resistance to wear.
High Rigidity & Load Capacity: The back-to-back duplex arrangement creates a wide effective spread, offering exceptional resistance to moment loads and tilting. This configuration provides high system stiffness and can support substantial combined radial and axial loads.
Precision & Stability: The Phenolic cage is lightweight and exhibits excellent performance at high speeds with minimal friction. Combined with the P4A tolerance class and extra light preload (Class A), this bearing ensures smooth, quiet, and vibration-free operation, which is essential for maintaining machining or positioning accuracy.
71918 CE/HCP4ADBA Bearing Typical Application Areas
This high-precision duplex bearing is engineered for the most demanding applications, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm articulation joints and high-accuracy rotary units.
- High-Frequency Motors & Spindles: Where extreme rotational accuracy and speed are required.
- Medical & Dental Equipment: High-speed handpieces and imaging scanner gantries.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other precision instrumentation.
