S71902 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
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Main Dimensions
Ball & Washer Dimensions
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S71902 ACD/HCP4A Bearing Product Overview & Core Advantages
The S71902 ACD/HCP4A is a high-precision, single-row angular contact ball bearing engineered for demanding applications requiring exceptional accuracy and performance. Its core advantages stem from its ceramic ball material and P4 (ABEC-7) tolerance class, enabling superior high-speed operation, reduced friction, and extended service life. This bearing is preloaded and sealed, making it a ready-to-install, high-rigidity solution capable of handling significant combined loads (radial and axial). Its compact bearing dimensions (15mm bore, 28mm OD, 7mm width) make it ideal for space-constrained, high-performance assemblies.
S71902 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
- S7: Denotes a series of high-precision angular contact ball bearings.
- 1902: Specifies the bearing size series (19) and bore diameter (02 for 15mm).
- ACD: Indicates a 25° contact angle and a specific internal design and preload level optimized for high rigidity and speed.
- HC: Signifies the Hybrid Ceramic construction, featuring steel rings and ceramic balls.
- P4: Identifies the tolerance class equivalent to ABEC-7, ensuring extremely tight dimensional and running accuracy.
- A: Indicates the bearing is supplied with a sealed configuration and pre-lubricated.
S71902 ACD/HCP4A Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of chrome steel rings and ceramic balls significantly reduces friction, heat generation, and wear. This allows for higher limiting speeds (up to 63,000 rpm), lower vibration, and longer service life compared to all-steel bearings, especially in high-speed applications.
Superior Rigidity and Load Capacity: The 25° contact angle and internal preload design provide high axial and radial stiffness, enabling the bearing to handle substantial combined loads with minimal deflection, which is critical for maintaining precision.
High-Speed Capability: The lightweight phenolic resin cage is optimized for high-speed operation, reducing centrifugal forces and ensuring stable performance at the limiting speed. The hybrid ceramic design further enhances this capability.
Sealed and Lubricated for Longevity: The integral seals protect against contamination and retain lubricant, making the bearing a maintenance-free component within its specified temperature range of -30°C to 110°C.
S71902 ACD/HCP4A Bearing Typical Application Areas
The S71902 ACD/HCP4A is ideally suited for high-speed, high-precision machinery, including:
- High-Frequency Spindles for CNC machining centers and PCB drilling machines
- Precision Instrumentation and optical scanners
- High-Speed Motors and turbo-molecular pumps
- Medical Device Drives and dental handpieces
- Aerospace Actuators and guidance systems
