Non-standard bearings refer to those that do not conform to the external dimensions specified in national standards, and their specifications, structures, or tolerance systems differ from the GB/T 273 series standards. These products are custom-made according to customer drawings and are characterized by low universality, small batch manufacturing, and high cost. They are commonly used in aerospace, high-speed rail, precision instruments, and other special equipment and complex working conditions. This type of bearing adopts personalized design, allowing for adjustments to structural parameters such as the number of steel balls and roller arrangement. The materials used include special types such as titanium alloy, ceramic, and stainless steel to meet requirements for corrosion resistance and high temperature resistance. Typical models include S695ZZ antimagnetic bearings and 2.5x5x1mm miniature deep groove ball bearings, which are used in fields such as watch movements and medical equipment. Daily maintenance involves surface treatment through solvent cleaning and compressed air purging, and the use of immersion or spraying of anti-rust oil to delay corrosion
