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Designations - Identification of bearing type

0Double row angular contact ball bearings
1Self-aligning ball bearings
2Spherical roller bearings, spherical roller thrust bearings
3Tapered roller bearings
4Double row deep groove ball bearings
5Thrust ball bearings
6Single row deep groove ball bearings
7Single row angular contact ball bearings
8Cylindrical roller thrust bearings
BKDrawn cup needle roller bearings with closed end
CCARB toroidal roller bearings
HKDrawn cup needle roller bearings with open ends
KNeedle roller and cage thrust assemblies
NCylindrical roller bearings
A second and sometimes a third letter are used to identify the configuration of the flanges, e.g. NJ, NU, NUP; double or multi-row cylindrical roller bearing designations always start with NN.
NANeedle roller bearings with boundary dimensions to ISO 15
NKNeedle roller bearings
QJFour-point contact ball bearings
TTapered roller bearings, a few metric sizes to ISO 355-1977
Inch tapered roller bearings with dimensions to an ABMA series are designated according to a different system to ANSI-ABMA Standard 19 (see also under prefix K-)
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