71918 ACDGC/HCP4A
Hybrid Ceramic Super Precision Bearings
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71918 ACDGC/HCP4A Bearing Product Overview & Core Advantages
The 71918 ACDGC/HCP4A is a single-row angular contact ball bearing engineered for exceptional precision and performance in demanding applications. Positioned in the P4A super-precision tolerance class, it delivers outstanding running accuracy and rotational stability. Its core advantage lies in its ability to support high combined loads (radial and axial) simultaneously, facilitated by a 25° contact angle. The use of ceramic balls and a phenolic cage enables superior high-speed performance and reduced rotational inertia. This bearing is pre-lubricated and features a universal matchable (SU) design, allowing for flexible mounting in duplex arrangements to achieve optimal rigidity and load capacity.
71918 ACDGC/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| 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. |
| D | High ceramic ball material for high-speed and longevity. |
| GC | Specific internal clearance and preload group (Moderate / Class C). |
| HC | Indicates a phenolic (polyamide) cage. |
| P4A | Denotes a super-precision tolerance class exceeding ABEC 7. |
71918 ACDGC/HCP4A Bearing Structural Features & Performance Benefits
- High-Speed Capability: The combination of ceramic balls and a lightweight phenolic cage significantly reduces centrifugal forces and friction, enabling a high limiting speed of 15,000 rpm. This design also offers excellent dimensional stability under thermal loads.
- Superior Rigidity and Load Capacity: The 25° contact angle and robust construction provide high rigidity, making it ideal for applications requiring minimal deflection. It offers a dynamic load rating of 9945 lbf and a static load rating of 10800 lbf.
- Precision Performance: Manufactured to P4A tolerance standards, this bearing ensures extremely low runout and vibration, which is critical for maintaining accuracy in precision machinery.
- Universal Matching Design (SU): As a universal matchable bearing, it can be paired with another identical bearing in various duplex arrangements (back-to-back, face-to-face, or tandem) to tailor the assembly's rigidity and moment load capacity without selective mounting.
71918 ACDGC/HCP4A Bearing Typical Application Areas
The 71918 ACDGC/HCP4A is designed for high-performance applications where precision, speed, and reliability are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed machining centers, grinding spindles.
- Precision Rotary Systems: Industrial robots, rotary tables.
- High-Speed Motors and Drives: Electric spindles, servo motors.
- Aerospace and Defense Systems: Gyroscopes, radar equipment.
- Medical Equipment: High-speed dental handpieces, centrifuges.
