S7204 ACD/HCP4A
Hybrid Ceramic Super Precision Bearings
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S7204 ACD/HCP4A Bearing Product Overview & Core Advantages
The S7204 ACD/HCP4A is a high-precision, single-row angular contact ball bearing designed for applications demanding exceptional accuracy and high-speed performance. Engineered to accommodate combined loads, it efficiently supports both radial and substantial axial loads in one direction. Its defining characteristics include a P4 (ABEC-7) tolerance class for superior running accuracy, a ceramic ball construction for reduced weight and enhanced speed capability, and a phenolic cage optimized for high rotational speeds. This bearing is preloaded and pre-lubricated, making it an ideal, ready-to-install solution for high-rigidity, high-reliability spindle arrangements.
S7204 ACD/HCP4A Bearing Model Code Explained, Specifications & Naming Convention
| Model Segment | Code | Technical Meaning |
|---|---|---|
| Basic Designation | S7204 | Indicates a high-precision angular contact ball bearing series with a 20mm bore, 47mm OD, and 14mm width. |
| Contact Angle | ACD | Specifies a 25° contact angle, optimized for supporting high axial loads. |
| Sealing / Cage | HCP4A | Denotes a sealed design and a phenolic cage, contributing to the high limiting speed of 38,000 rpm. The "P4A" suffix confirms the P4 tolerance class and specific internal design. |
S7204 ACD/HCP4A Bearing Structural Features & Performance Benefits
- High-Speed Capability: The combination of ceramic balls (lower density, reduced centrifugal forces) and a lightweight phenolic cage is engineered to achieve an exceptionally high limiting speed, making it suitable for very demanding spindle applications.
- Superior Rigidity and Accuracy: The bearing is supplied with a preload, which eliminates internal clearance. This significantly increases system stiffness, improves rotational accuracy, and reduces vibration and noise.
- High Load Capacity: The 25° contact angle design is optimized to carry significant combined loads, particularly one-direction axial loads, in addition to radial loads.
- Maintenance-Free Operation: As a sealed and pre-lubricated unit, the bearing is protected from contamination and is lubricated for life under normal operating conditions, ensuring long-term reliability and reducing maintenance needs.
S7204 ACD/HCP4A Bearing Typical Application Areas
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Instrumentation: High-speed measuring and testing equipment.
- High-Frequency Motors and Spindles: Applications requiring extreme rotational velocities.
- Medical and Dental Equipment: High-speed handpieces and drills.
