71938 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
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71938 ACD/HCP4A Bearing Product Overview & Core Advantages
The 71938 ACD/HCP4A is a single-row angular contact ball bearing engineered for high-precision applications requiring exceptional rotational accuracy and high rigidity. Designed to accommodate primarily axial loads in one direction and combined loads, this bearing features a 25° contact angle for optimal load distribution. Its P4 (ABEC-7) tolerance class ensures superior running accuracy, making it ideal for demanding, high-speed machinery. The combination of a phenolic cage and ceramic balls contributes to its outstanding performance in challenging operational environments.
71938 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
- 71938: Basic model number, indicating a metric, single-row angular contact ball bearing with a 190mm bore.
- ACD: Designates a 25° contact angle and specific internal design optimized for high precision and load capacity.
- H: Indicates that the bearing is supplied with a preload for enhanced rigidity and reduced axial/radial play.
- C: Signifies the use of a phenolic (polyamide) cage.
- P4A: Denotes a P4 tolerance class (equivalent to ABEC-7) with specific dimensional and running accuracy requirements.
71938 ACD/HCP4A Bearing Structural Features & Performance Benefits
High Rigidity and Precision: The 25° contact angle and preload (H) provide superior system stiffness and minimize deflection under load, ensuring precise shaft positioning and excellent running accuracy mandated by the P4 tolerance class.
Enhanced High-Speed Capability: The lightweight phenolic cage (C) and ceramic balls reduce centrifugal forces, enabling higher limiting speeds (up to 8,000 rpm) and reduced operational friction and heat generation.
Superior Load Capacity: Engineered to handle significant axial loads in one direction and combined (radial and axial) loads, with a high dynamic load rating of 36,675 lbf and static load rating of 46,800 lbf.
Optimized for Demanding Conditions: The ceramic ball material offers advantages such as reduced weight, electrical insulation, and the ability to operate effectively within a broad temperature range (-30°C to 110°C).
71938 ACD/HCP4A Bearing Typical Application Areas
This high-precision angular contact bearing is ideally suited for applications requiring high speed, rigidity, and accuracy, including:
- Machine Tool Spindles
- High-Frequency Machining Centers
- Precision Grinding Spindles
- Industrial Pumps and Compressors
- High-Speed Robotic Drives
