71918 ACD/HCP4ATBTB
Hybrid Ceramic Super Precision Bearings
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71918 ACD/HCP4ATBTB Bearing Product Overview & Core Advantages
The 71918 ACD/HCP4ATBTB is a precision angular contact ball bearing designed for demanding applications requiring exceptional accuracy and rigidity. This bearing is supplied as a triplex back-to-back (TBT) matched set, providing superior stiffness and the ability to withstand combined loads (radial and axial loads) simultaneously. Manufactured to a P4A tolerance class and featuring a ceramic ball and phenolic cage construction, it is engineered for high-speed operation and long-term reliability in precision machinery.
Model Code Breakdown
| Code Segment | Technical Meaning |
|---|---|
| 71918 | Basic bearing series and size designation (90mm bore, 125mm OD). |
| ACD | Angular Contact design with a 25° contact angle. |
| HC | Hybrid Ceramic construction, indicating ceramic balls and steel rings. |
| P4A | High precision tolerance class, exceeding ABEC 7 standards. |
| TBT | Triplex Back-to-Back arrangement of three matched bearings. |
71918 ACD/HCP4ATBTB Bearing Structural Features & Performance Benefits
High Rigidity & Load Capacity: The triplex back-to-back (TBT) matched set configuration creates an extremely rigid bearing system, capable of handling high combined loads and moments. The 25° contact angle is optimized for sustaining significant axial loads in addition to radial loads.
High-Speed & Thermal Performance: The combination of a lightweight phenolic cage and low-density ceramic balls reduces centrifugal forces, enabling higher limiting speeds (15,000 rpm). Ceramic balls also exhibit lower thermal expansion and superior performance in high-temperature environments.
Precision Operation: Manufactured to a P4A tolerance class, this bearing ensures minimal runout and vibration, which is critical for applications requiring high rotational accuracy.
Pre-Lubricated: The bearing comes pre-lubricated, ensuring immediate operational readiness and protection during the initial run-in period.
71918 ACD/HCP4ATBTB Bearing Typical Application Areas
The 71918 ACD/HCP4ATBTB is ideally suited for high-performance applications where precision, speed, and rigidity are paramount. Key industries and equipment include:
- Machine Tool Spindles (High-speed milling, grinding)
- Precision Robotics and Automation Arms
- High-Frequency Motors and Spindles
- Aerospace & Defense Instrumentation
- Medical Equipment (e.g., High-speed dental handpieces)
