“Deep groove ball bearings are the most widely used and highest-consumption core components in drones. Their performance directly determines flight stability, endurance and service life.”

Drones have core requirements for bearings: high speed, lightweight design, low friction and resistance to harsh environments. With their simple structure, strong adaptability and controllable cost, deep groove ball bearings have become the preferred choice for many key subsystems.

Deep groove ball bearings consist of an inner ring, an outer ring, steel balls and a cage. Their deep groove raceways can support both radial and slight axial loads simultaneously without the need for additional thrust bearings, meeting the lightweight requirements of drones. They are mainly used in brushless motors and rotor systems, and are also suitable for components such as small gimbals and steering gears.

As the "heart" of drones, brushless motors can reach tens of thousands of revolutions per minute. Most civilian drones use miniature deep groove ball bearings such as 5×11×4 mm and 8×22×7 mm, which are mounted in pairs at both ends of the motor shaft. Bearings of ABEC-5 precision or higher with 2RS/ZZ sealing are selected. For example, the 608 bearing (inner diameter 8 mm, P6 precision) has a limiting speed of 18,000 rpm and a dynamic load rating of 4.8 kN, making it a standard choice for motors in small civilian drones.

Consumer drone gimbals use even smaller miniature bearings, requiring low friction and low noise (≤20dB). Servos and control linkages adopt chrome steel (GCr15) bearings; after heat treatment, their hardness reaches HRC60–64, improving fatigue resistance.

Offshore operation drones adopt 440C stainless steel bearings for salt spray resistance, while industrial drones used in high-temperature environments are equipped with high-temperature resistant grease rated for -30℃ to +120℃.With outstanding cost performance, deep groove ball bearings have become indispensable basic components in the drone industry.

In summary, the core value of deep groove ball bearings lies in simplifying structure, improving efficiency and controlling costs. They are used across multiple drone systems. With the advancement of drone technology, these bearings are evolving toward higher precision, lighter weight and maintenance-free operation.