Non-standard bearings refer to bearings that do not conform to standard specifications and dimensions. Unlike standard bearings, which are widely used and readily available in the market, non-standard bearings are specifically designed and manufactured to meet unique and specific requirements of different applications. Non-standard bearings are specialized bearings that are custom-made or designed to meet specific requirements of different applications. They can be categorized into various types based on their unique characteristics and applications, such as customized bearings, miniature bearings, thin-section bearings, ceramic bearings, stainless steel bearings, high-speed bearings, high-temperature bearings, and special-purpose bearings.