Deep groove ball bearings are widely used because they possess a series of excellent properties:
Mainly support radial loads: As the name suggests, they are best suited to withstand forces in the direction of the bearing radius (radial loads). For example, wheel bearings primarily withstand radial forces from the vehicle’s weight.
Can also withstand certain bidirectional axial loads: Due to the deep grooves in the raceways, they can also withstand a certain degree of forces along the axis (axial loads). However, their axial load capacity is far lower than that of thrust bearings specifically designed for this purpose.
Excellent high-speed performance: Low friction and heat generation make them ideal for high-speed applications.
Low friction and heat generation: The rolling friction design results in low starting torque, smooth operation, and high efficiency.
Simple structure and low manufacturing cost: High standardization allows for easy mass production and a relatively low price.
Easy maintenance: Most bearings are sealed or shielded and pre-greased at the factory, requiring no maintenance throughout their lifecycle (maintenance-free bearings).
It can be said that wherever there’s rotation, there’s a high probability of a deep groove ball bearing.
II. Applications
Household Appliances: Motors in washing machines, air conditioners, electric fans, vacuum cleaners, hard disk drives, etc.
Automotive: Wheels, generators, air conditioning compressors, gearboxes, water pumps, etc.
Industrial Motors: Almost all types of electric motors and generators.
Office Equipment: Printers, copiers, computer cooling fans.
General Machinery: Gearboxes, conveyor belt rollers, agricultural machinery, etc.
Everyday Objects: Scooters, bicycles (although bicycles often use more specialized angular contact bearings, the principle is similar), toys, etc.
III. Common Variants and Accessories
To adapt to different environments, deep groove ball bearings have many variants:
Sealing Types:
ZZ: Metal dust caps on both sides. Dust-proof, but not completely leak-proof.
2RS: Rubber contact seals on both sides. Better dust and oil protection, but slightly increased friction.
Pre-lubricated grease: Most bearings are factory-filled with a grease suitable for common operating conditions (such as lithium-based grease), eliminating the need for users to add grease.
Dimensional series: To accommodate varying loads, bearings with the same bore diameter may have different widths and outer diameters, referred to as “width series” and “diameter series.”
For example, “6204” and “6304” both have a 20mm bore diameter, but the latter has a larger outer diameter and width, resulting in a greater load-bearing capacity.