How to Read & identify Bearing by Bearing Number Calculation and Nomenclature /ElectricalTechnician /ElectricalTechnical What Does Bearing Number say Silently 6 3 05 ZZ C3 Internal clearance Sealing Bore size Bearing Series Bearing Type Types of Bearings and Their Code in Bearing Number 6 3 05 ZZ C3 Bearing Type R Bearing Type Bearing Name 1 Self aligning Ball Bearing 2 Spherical ball bearing 3 6 Means Single row deep groove ball bearing Bearing Type NA Needle roller bearing contact Ball Bearing BK Thrust ball bearing Single row deep groove 32/T bearing Double row Angular 5 8 Cylinderical roller Double row roller bearing Double row ball bearing 7 Inch bearing NN 4 6 N Bearing Name ball bearing Single row angular contact Felt Seal Bearing Tappered roller bearing HK C K QJ Needle roller bearing with closed end Needle roller bearing with open end CARB toroidal roller bearing Needle roller bearing and cast thrust assembly Four Point contact ball bearing Types of Bearings and Their Code in Bearing Number 6 3 05 ZZ C3 Bearing Series 3 means the bearing is of Medium series or Medium toughness. Series Code 0 1 2 3 4 8 Extra Light Extra light Thrust Light Medium Heavy Extra Thin Section 9 Very Thin Section Series Description Types of Bearings and Their Code in Bearing Number 6 3 05 ZZ C3 Bore size of Bearing bearing’s bore size is 25 mm. Third and Fourth Digit 0 1 2 3 4 5 Bore size in mm 10 12 15 17 (x5) 20 (x5) 25 And so on...... Types of Bearings and Their Code in Bearing Number 6 3 05 ZZ C3 shielding or sealing and other specialty in the bearing the last letters ‘ZZ’ means the bearing is shielded from both sides. Code (Last letter) Z Description single side shieled ZZ Both Sides Shielded RS one side rubber sealed 2RS double side rubber sealed V one side non contact seal VV DDU NR both side non contact seals both side contact seals snap ring and groove M brass case C3 the clearance factor Types of Bearings and Their Code in Bearing Number 6 3 05 ZZ C3 CODE C2 Internal clearance C3 C4 C5 Radial internal clearance greater than Normal P5 P6 P62 INTERNAL CLEARANCE Radial internal clearance smaller than Normal Radial internal clearance greater than Normal Radial internal clearance greater than C3 Radial internal clearance greater than C4 Dimensional and geometrical tolerances to class P5 Dimensional and geometrical tolerances to class P6 P6 + C2
