1218 K/C4
1200 Series Self Aligning Ball Bearings
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Basic Information
Main Dimensions
Inner Ring Dimensions
Outer Ring Dimensions
Performance
Materials
Environment & Compliance
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1218 K/C4 Bearing Product Overview & Core Advantages
The 1218 K/C4 is a double row angular contact ball bearing designed for exceptional performance in demanding applications. This metric bearing features a 1:12 tapered bore for secure shaft mounting and is engineered to handle significant radial loads. Its double row construction provides high rigidity and stability, making it an ideal choice for machinery requiring precise shaft positioning and robust support. The bearing is pre-lubricated and features an open design, offering versatility for various lubrication systems. With a C4 radial internal clearance, it is well-suited for applications with thermal expansion considerations.
1218 K/C4 Bearing Model Code Explained, Specifications & Naming Convention
| Code Segment | Technical Meaning |
|---|---|
| 1218 | Basic bearing designation indicating a double row angular contact ball bearing with a 90mm bore and 160mm outside diameter. |
| K | Denotes a tapered bore with a 1:12 taper ratio, facilitating precise axial positioning and interference fit on the shaft. |
| C4 | Indicates a greater than normal radial internal clearance. This is crucial for applications where differential thermal expansion between the bearing and shaft/housing occurs, preventing preload and potential seizure. |
1218 K/C4 Bearing Structural Features & Performance Benefits
- High Rigidity & Load Capacity: The double row ball construction provides superior radial stiffness and load-carrying capacity compared to single row designs, ensuring stable operation under heavy loads.
- Tapered Bore for Secure Mounting: The 1:12 tapered bore allows for a tight, interference fit on a tapered shaft adapter, eliminating inner ring creep and ensuring precise running accuracy.
- Optimized for Thermal Conditions: The specified C4 radial clearance accommodates thermal expansion, making this bearing suitable for applications with significant temperature fluctuations or where the shaft operates at a higher temperature than the housing.
- High-Speed Capability: The lightweight Nylon cage ensures smooth operation and low friction, contributing to a high limiting speed of 5,300 rpm. The open design allows for efficient lubrication management.
- Durable Material Construction: Manufactured from high-grade Chrome Steel for both rings and balls, ensuring long service life and reliable performance under demanding conditions.
1218 K/C4 Bearing Typical Application Areas
The 1218 K/C4 is engineered for robust industrial applications where high radial load capacity, secure shaft mounting, and accommodation of thermal expansion are critical. Key sectors include:
- Vibrating Screens and Conveyors: Where shock loads and thermal effects are common.
- Agricultural Machinery: Such as tractor gearboxes and heavy-duty implements.
- Industrial Gearboxes and Transmissions: Requiring precise shaft location and high rigidity.
- Electric Motors and Generators: Particularly larger units where shaft expansion must be considered.
- Material Handling Equipment: Including pulley systems and rolling mills.
