71905 ACE/HCP4AL
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
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71905 ACE/HCP4AL Bearing Product Overview & Core Advantages
The 71905 ACE/HCP4AL is a single-row angular contact ball bearing engineered for applications demanding high precision and high-speed performance. As a P4A tolerance class bearing, it offers exceptional dimensional accuracy and running precision. Its core advantage lies in its ability to support combined loads (radial and axial) efficiently, facilitated by a 25° contact angle. The use of ceramic balls and a phenolic cage contributes to lower friction, higher limiting speeds, and extended service life, making it ideal for high-reliability, precision machinery.
71905 ACE/HCP4AL Bearing Model Code Explained, Specifications & Naming Convention
The model number 71905 ACE/HCP4AL provides detailed technical specifications. Below is a breakdown of its key suffixes:
| Suffix | Technical Meaning |
|---|---|
| ACE | Indicates a 25° contact angle and specific internal design optimized for high-speed operation and high rigidity. |
| HC | Signifies the use of Hybrid Ceramic balls (Silicon Nitride), which reduce weight, friction, and heat generation. |
| P4A | Denotes a super-precision tolerance class with extremely tight bore, outer diameter, and width tolerances for superior running accuracy. |
| L | Indicates the bearing is pre-lubricated with a specific grease suitable for its operational temperature range. |
71905 ACE/HCP4AL Bearing Structural Features & Performance Benefits
The design of the 71905 ACE/HCP4AL incorporates several features that deliver distinct performance advantages:
- Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls significantly reduces centrifugal forces and friction, enabling a high limiting speed of 83,000 rpm. This also provides electrical insulation and superior performance in high-temperature environments.
- Phenolic Resin Cage: The lightweight and robust phenolic cage ensures excellent dimensional stability and low friction at high speeds, contributing to smooth operation and reduced wear.
- High Rigidity & Load Capacity: The 25° contact angle and precision-ground raceways provide high rigidity, allowing the bearing to effectively handle significant combined radial and axial loads.
- Precision & Preload: Manufactured to P4A tolerance class, this bearing guarantees minimal runout and vibration. It is supplied as a universal matching bearing (set of 2), allowing for precise preload adjustment in duplex arrangements (DB, DF, DT) to achieve optimal system stiffness.
71905 ACE/HCP4AL Bearing Typical Application Areas
This high-precision, high-speed angular contact bearing is ideally suited for demanding applications across various industries, including:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Robotics: Arm joints and high-accuracy positioning systems.
- High-Frequency Motors and Spindles: PCB drilling spindles and dental handpieces.
- Aerospace & Defense Systems: Gyroscopes, navigation instruments, and radar equipment.
- Medical Equipment: Centrifuges and high-speed laboratory apparatus.
