71918 ACEGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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71918 ACEGA/HCP4A Bearing Product Overview & Core Advantages
The 71918 ACEGA/HCP4A is a single row angular contact ball bearing designed for high-precision applications requiring exceptional rotational accuracy and rigidity. Manufactured to P4A tolerance class, this bearing is characterized by its ability to accommodate high combined loads, particularly thrust loads in one direction. Its compact design, featuring a 90 mm bore and 18 mm width, makes it ideal for space-constrained, high-performance machinery. The use of ceramic balls and a phenolic cage contributes to its superior high-speed capabilities and reduced operational weight.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71918 | Basic bearing series and size designation (90mm bore, 125mm OD, 18mm width) |
| AC | Angular Contact design with a 25° contact angle |
| EGA | Universal Matchable (SU) bearing set, preloaded to Extra Light (Class A) |
| HC | Hybrid Ceramic: Ceramic balls with steel rings |
| P4A | High precision tolerance class, exceeding ABEC 7 standards |
71918 ACEGA/HCP4A Bearing Structural Features & Performance Benefits
This bearing's performance is derived from its advanced material composition and precision engineering:
- High Rigidity & Load Capacity: The 25° contact angle and robust chrome steel rings provide excellent resistance to combined radial and axial loads, with a dynamic load rating of 6435 lbf.
- Superior High-Speed Performance: The combination of ceramic balls (Si3N4) and a lightweight phenolic resin cage reduces centrifugal forces and friction, enabling a high limiting speed of 15,000 rpm.
- Precision & Accuracy: Manufactured to P4A tolerance class with tight dimensional tolerances on the bore, outside diameter, and width, ensuring minimal runout and vibration for smooth operation.
- Pre-Lubricated & Ready for Use: The bearing comes pre-lubricated, facilitating immediate installation and initial operation within its specified temperature range of -30°C to 110°C.
71918 ACEGA/HCP4A Bearing Typical Application Areas
The 71918 ACEGA/HCP4A is engineered for demanding applications where precision, speed, and reliability are critical. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling and grinding spindles.
- Precision Robotics: Joint and arm actuators requiring high rigidity and accuracy.
- Aerospace & Defense Systems: Gyroscopes, navigation systems, and auxiliary power units.
- High-Frequency Motors: Spindle motors for IT and semiconductor manufacturing equipment.
