There are nine major categories of bearings, each with its own structure and purpose:
Bearing numbers beginning with 6 are Category 0 bearings, also known as Deep groove ball bearings
Bearing numbers beginning with 1 or 2 are Category 1 bearings, also known as self-aligning ball bearings.
Bearing numbers beginning with NN, NU, or NJ are Category 2 bearings, also known as cylindrical roller bearings.
Bearing numbers beginning with 21, 22, 23, or 24 are Category 3 bearings, also known as spherical roller bearings.
Bearing numbers beginning with NA, NK, RA, or HK are Category 4 bearings, also known as needle roller bearings.
Bearing numbers beginning with 7 are Category 6 bearings, also known as angular contact bearings.
Bearing numbers beginning with 3 are Category 7 bearings, also known as tapered roller bearings.
Bearing numbers beginning with 51 and 52 are Category 8 bearings, also known as thrust ball bearings and planar thrust bearings.
Bearing numbers beginning with 81 and 29 are Category 9 bearings, also known as thrust roller bearings.
Each bearing type and code corresponds to a different structure. Understanding these bearing model codes is crucial to understanding the logic of bearings in the industrial field.
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