Metric Deep Groove Ball Bearings (6000,6200,6300,6400 Series)
Because of their versatility, single-row deep groove ball bearings are the most popular of the antifriction bearing types. They are available in a broad range of sizes, from miniature ball bearings with outside diameters of less than 9mm to extra-large bearings that exceed 800mm in diameter. These bearings are also available in a wide variety of shield, seal and snap-ring arrangements.

6000 ~ 6026,  6200 ~ 6226,  6300 ~ 6320, 6403 ~6418 with different types, such as open, ZZ, 2RS, N, NR etc.