6218 M/HC5C3S0
6000 Series HC5/HC5C3 Hybrid Ceramic Bearings
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6218 M/HC5C3S0 Bearing Product Overview & Core Advantages
The 6218 M/HC5C3S0 is a single row deep groove ball bearing engineered for high-performance applications demanding precision and reliability. Its core advantage lies in the use of Silicon Nitride (Si3N4) ceramic balls, which significantly reduce friction, weight, and wear compared to traditional steel ball bearings. This construction provides excellent capabilities for handling radial loads and is optimized for operation at high speeds. The bearing's open design and C3 radial internal clearance make it suitable for applications with thermal expansion or where specific preload conditions are required, offering a robust solution for demanding industrial environments.
6218 M/HC5C3S0 Bearing Model Code Explained, Specifications & Naming Convention
- 6218: Basic model number, indicating a single row deep groove ball bearing with a 90mm bore and 160mm outside diameter.
- M: Signifies a machined metal cage, typically brass or steel, offering high strength and suitability for high-speed operation and demanding conditions.
- HC5: Denotes the use of Hybrid Ceramic balls, specifically Silicon Nitride (Si3N4). This provides benefits like electrical resistance, reduced weight, and the ability to run at higher speeds with less lubrication.
- C3: Indicates a greater than normal radial internal clearance. This is selected for applications where thermal expansion is a factor or where a specific preload is not desired.
- S0: Specifies a standard ring material of through-hardened chrome steel, providing a high load rating and durability.
6218 M/HC5C3S0 Bearing Structural Features & Performance Benefits
Hybrid Ceramic Construction: The combination of steel rings and Silicon Nitride balls results in lower centrifugal forces, reduced operating temperature, and extended service life, especially in high-speed applications. The ceramic balls are also electrically insulating, preventing damage from electrical arcing.
High-Speed Capability: The machined metal cage (M) and lightweight ceramic balls contribute to a high limiting speed of 4,000 rpm (with grease lubrication), making this bearing ideal for precision spindles and other high-velocity machinery.
Robust Load Capacity: With a dynamic load rating of 21,604 lbf and a static load rating of 16,074 lbf, this bearing is designed to handle significant radial loads reliably.
Precision & Thermal Management: Manufactured to ABEC 1 / ISO P0 tolerance class, it ensures consistent performance. The C3 clearance allows for thermal expansion, preventing binding and ensuring smooth operation across its wide temperature range of -30°C to 150°C.
6218 M/HC5C3S0 Bearing Typical Application Areas
The 6218 M/HC5C3S0 is ideally suited for advanced applications where its hybrid ceramic technology and high-speed performance are critical. Typical uses include:
- High-Speed Machine Tool Spindles
- Precision Grinding & Milling Applications
- Electric Motors & Generators (particularly for mitigating electrical erosion)
- Turbomachinery & Pumps
- Aerospace & Racing Components
