71918 ACE/HCP4ADGA
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
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71918 ACE/HCP4ADGA Bearing Product Overview & Core Advantages
The 71918 ACE/HCP4ADGA is a super-precision angular contact ball bearing engineered for the most demanding high-speed and high-rigidity applications. This universal matchable (SU) bearing is supplied in a set of two, pre-loaded to Extra Light (Class A) specifications, ensuring optimal performance and minimal heat generation. Its defining features include a 25° contact angle for superior axial load capacity and a phenolic resin cage that enables exceptional limiting speeds of up to 15,000 rpm. Manufactured to the stringent P4A tolerance class, it delivers the ultimate in rotational accuracy and system stability.
71918 ACE/HCP4ADGA Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning | Significance |
|---|---|---|
| 71918 | Basic bearing series and size designation (90mm bore, 125mm OD, 36mm width) | Defines the core bearing dimensions. |
| ACE | Internal design code for optimized contact geometry and high-speed performance. | Enhances dynamic response and load distribution. |
| HC | Hybrid Ceramic: Signifies ceramic balls and steel rings. | Reduces centrifugal forces, lowers friction, and extends service life, especially at high speeds. |
| P4A | Tolerance class equivalent to ABEC 7/ISO P4, with additional running accuracy requirements. | Guarantees exceptional dimensional and running accuracy for precision machinery. |
| DGA | Universal Matchable (SU) bearing in a duplex set with Extra Light (A) preload. | Allows for flexible mounting configurations (DB, DF, DT) to handle combined loads. |
71918 ACE/HCP4ADGA Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings and silicon nitride (Si3N4) ceramic balls significantly reduces weight and inertial forces within the bearing. This is critical for achieving high rotational speeds with minimal heat generation and improved stiffness.
Phenolic Resin Cage: The lightweight and robust phenolic cage is essential for high-speed operation. It offers excellent dimensional stability and low friction, contributing directly to the bearing's impressive 15,000 rpm limiting speed.
Universal Match (SU) & Preload: Supplied as a pre-mounted and pre-loaded pair, these bearings are "universally matchable." This means they can be arranged in back-to-back (DB), face-to-face (DF), or tandem (DT) configurations without requiring selective assembly, simplifying installation and ensuring consistent, high system rigidity to manage complex combined radial and axial loads.
Super-Precision P4A Tolerances: Manufactured to the P4A class, this bearing provides extremely tight tolerances on bore, outside diameter, and width, resulting in superior running accuracy, reduced vibration, and predictable performance in precision spindles.
71918 ACE/HCP4ADGA Bearing Typical Application Areas
The 71918 ACE/HCP4ADGA is the bearing of choice for high-performance applications where speed, accuracy, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling and routing spindles.
- High-Frequency Motors: Spindles for electric motors operating at very high RPMs.
- Aerospace & Defense Systems: Gyroscopes, radar systems, and other critical rotating assemblies.
- Medical Equipment: Dental handpieces and high-speed surgical tools.
