High temperature adaptability of NTN bearings
High Temperature Adaptability of NTN Bearings
NTN bearings are designed to perform reliably in a variety of temperature conditions. For bearings with an outer diameter less than 240mm, the heat treatment process ensures stability at temperatures below 150°C. However, when operating temperatures exceed this threshold, special heat treatment is required. These high-temperature resistant NTN bearings are typically marked with suffixes S1 through S4, as defined by DIN 623. - **S1**: Maximum operating temperature of 200°C - **S2**: Maximum operating temperature of 250°C - **S3**: Maximum operating temperature of 300°C - **S4**: Maximum operating temperature of 350°C For NTN bearings with an outer diameter greater than 240mm, they generally maintain good performance at temperatures below 200°C. Some NTN bearings are constructed using glass fiber reinforced nylon 66, which is suitable for environments where the operating temperature does not exceed 120°C. These bearings require lubrication with oil. If the oil contains additives, it may reduce the lifespan of the cage. Additionally, if the temperature exceeds 120°C, the lubricating oil may age and cause premature wear. Therefore, regular inspection and replacement of the lubricant is essential. The temperature tolerance of sealed NTN bearings also depends on the type of grease used and the effectiveness of the sealing system. Sealed NTN bearings are usually filled with high-quality lithium-based grease that can withstand short-term exposure to temperatures up to 120°C. However, once the operating temperature reaches 70°C or higher, the life of the lithium-based grease will be significantly reduced. If a bearing is expected to operate frequently under high-temperature conditions, it is recommended to use specialized high-temperature lubricants. In addition, heat-resistant materials should be used for the sealing components. Standard contact seals are typically limited to a maximum operating temperature of 110°C. In cases where high-temperature sealing materials are used, such as certain fluorinated compounds, care must be taken, as these materials can emit harmful gases and smoke when exposed to temperatures above 300°C. When disassembling NTN bearings, it's important to use a welding torch carefully to avoid damaging the component. --- **Related Bearing Knowledge** Radial bearing terminology, English control, Japanese imported full ball bearings, features of protection, TIMKEN imported bearings, three effective methods for tapered roller bearings, common sense about water pump shaft bearings, zinc-based bearing alloys, liquid-solid kneading process. This article is sourced from China Bearing Network. Please visit [China Bearing Network](http://) for more information. Previous: Japan Seiko NSK Imported Bearing Rear Code Clarification Next: Two Types of Bearing Locking Methods
Wiper Seals are a type of mechanical seal commonly used to protect piston rods and pistons in hydraulic and pneumatic equipment. The main function of Wiper Seals is to prevent dust, dirt, and other impurities from entering the interior of the equipment, thereby protecting the sealing performance of the piston rod and piston, and extending the service life of the equipment.
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