71918 ACDGA/HCP4AL
Hybrid Ceramic Super Precision Bearings
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71918 ACDGA/HCP4AL Bearing Product Overview & Core Advantages
The 71918 ACDGA/HCP4AL is a high-precision angular contact ball bearing engineered for applications demanding exceptional accuracy and reliability. This single bearing features a 25° contact angle and Extra light preload (Class A), making it ideal for managing combined loads where high rigidity and precise rotational performance are critical. Manufactured to P4A tolerance class, it offers superior dimensional stability and running accuracy. The use of ceramic balls and a phenolic cage contributes to its high-speed capability, low friction, and extended service life in demanding operational environments.
71918 ACDGA/HCP4AL Bearing Model Code Explained, Specifications & Naming Convention
- 71918: Basic designation indicating a light series, angular contact bearing with a 90mm bore and 125mm outside diameter.
- AC: Angular Contact design.
- D: High contact angle (25°).
- GA: Universal Matchable bearing. This bearing can be universally matched with other bearings of the same designation in any combination to achieve a specific preload or tolerance.
- HCP4A: P4A Tolerance Class. This denotes a very high precision grade with tighter tolerances on bore, outside diameter, and width than standard precision classes.
- L: Light preload designation (consistent with the "Extra light / Class A" specification).
71918 ACDGA/HCP4AL Bearing Structural Features & Performance Benefits
High Precision and Rigidity: The P4A tolerance class ensures minimal runout and vibration, providing the stability required for ultra-precise applications. The optimized 25° contact angle effectively supports combined radial and axial loads, delivering high system rigidity.
High-Speed Performance: The combination of ceramic balls (silicon nitride) and a phenolic resin cage enables superior high-speed operation. Ceramic balls are lighter and harder than steel, reducing centrifugal forces and wear, while the phenolic cage offers excellent strength-to-weight ratio and smooth operation at the limiting speed of 15,000 rpm.
Universal Matching Capability (SU): Designed as a Universal Matchable (SU) bearing, the 71918 ACDGA/HCP4AL can be flexibly mounted in sets (as indicated by the matched set of 3) to achieve precise preload and stiffness characteristics without selective sorting, simplifying installation and inventory management.
Open Design with Lubrication: The open seal type allows for optimal lubrication flow and heat dissipation, which is crucial for high-speed applications. The bearing is supplied lubricated, ready for initial operation within its specified temperature range of -30°C to 110°C.
71918 ACDGA/HCP4AL Bearing Typical Application Areas
This bearing is specifically designed for high-performance machinery where precision and speed are paramount. Its primary applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy rotary axes.
- Aerospace Equipment: Gyroscopes, navigation systems, and auxiliary power units.
- Medical Devices: High-speed dental handpieces and imaging scanner rotors.
- Test and Measurement Equipment: Coordinate measuring machines and precision rotary tables.
