Non-standard bearings refer to bearings that do not conform to the dimensions specified in national standards. Their specifications, structure, or tolerance system may differ from those in the GB/T 273 series. These bearings are custom-made according to customer drawings and are characterized by low versatility, small-batch manufacturing, and high costs. They are commonly used in specialized equipment and complex operating conditions, such as aerospace, high-speed rail, and precision instruments.
These bearings feature a personalized design, with adjustable structural parameters such as the number of balls and roller arrangement. Materials include titanium alloys, ceramics, and stainless steel to meet corrosion and high-temperature resistance requirements. Typical models include the S695ZZ anti-magnetic bearing and the 2.5x5x1mm miniature deep groove ball bearing, which are used in watch movements, medical equipment, and other fields. Routine maintenance requires surface treatment through solvent cleaning and compressed air purging, and rust prevention oil immersion or spraying to slow down rust.
Its main characteristics are low degree of versatility, mostly used for special equipment and special occasions, small batches, and most of them are trial products of newly developed equipment; but because it is not large-scale and mass-produced, there are not many manufacturers, the cost is high, and the price is relatively expensive.
