S71904 CDGA/HCP4A
Hybrid Ceramic Super Precision Bearings
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Basic Information
Main Dimensions
Ball & Washer Dimensions
Performance
Materials
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S71904 CDGA/HCP4A Bearing Product Overview & Core Advantages
The S71904 CDGA/HCP4A is a super-precision angular contact ball bearing designed for the most demanding high-speed and high-rigidity applications. As a single bearing with a 15° contact angle and Universal Matchable (SU) designation, it is engineered to accommodate combined radial and axial loads simultaneously. Its construction with ceramic balls and a phenolic cage enables exceptional limiting speeds and thermal stability, making it ideal for high-precision spindles and other machinery requiring ultimate reliability and performance.
S71904 CDGA/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
- S7: High-precision bearing series
- 1904: Dimension series (19) and bore code (04 for 20mm bore)
- CD: Contact angle of 15°
- G: Cage guidance (cage guided by outer ring land)
- A: Extra light preload (Class A)
- HCP4A: P4A tolerance class (geometric tolerances tighter than ABEC 7) and universal matching specification
S71904 CDGA/HCP4A Bearing Structural Features & Performance Benefits
This bearing's performance is derived from its advanced material selection and precision engineering. The use of ceramic balls (Si3N4) significantly reduces centrifugal forces, lowers operating temperature, and extends bearing life, which is critical for achieving the high limiting speed of 75,000 rpm. The phenolic resin cage offers excellent strength-to-weight ratio and operates smoothly at high speeds with minimal friction. The P4A tolerance class ensures extreme running accuracy, low vibration, and high system rigidity. The extra light preload (Class A) minimizes deflection under load while maintaining high rotational accuracy, making it perfectly suited for ultra-high-speed spindles.
S71904 CDGA/HCP4A Bearing Typical Application Areas
The S71904 CDGA/HCP4A is predominantly used in applications where high speed, high precision, and high rigidity are paramount. Typical applications include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Instrumentation: High-speed centrifuges and coordinate measuring machines.
- Semiconductor Manufacturing Equipment: Wafer handling robots and stepper stages.
- Aerospace Systems: Gyroscopes and auxiliary power units.
