NBC BEARING 6201 BB-18

6201: This is the standard ISO designation for the bearing size.

• 6: Indicates a single-row deep groove ball bearing.2

  
  

• 2: Indicates the "light" duty series.3

  
  

• 01: Corresponds to a bore diameter of 12 mm (the bore size for the last two digits 4$01$ is calculated as 5$1 \times 5 = 5$ is incorrect for 6$01$.7 For the 8$00, 01, 02, 03$ designations, the bore diameters are 9$10\text{ mm}, 12\text{ mm}, 15\text{ mm}, 17\text{ mm}$ respectively.10 For $04$ and above, you multiply the last two digits by 5).

  
  

  
  

BB: This suffix likely indicates the sealing type, usually standing for seals on both sides.11 It is equivalent to common designations like 2RS (two rubber seals) or LLU (double lip seal), meaning the bearing is sealed against dust and moisture and is pre-lubricated with grease.12

-18: This suffix is specific to the manufacturer (NBC) and may relate to a particular variant, cage material, internal clearance, or specific application (e.g., for certain two-wheeler models). Without the specific NBC catalogue, the exact meaning of the -18 is less certain, but the core bearing and sealing type are defined by 6201 BB.13

Basic Dynamic Load Rating (14$C$): 15$\approx 6.6$ to 16$7.7\text{ kN}$

Basic Static Load Rating (17$C_0$): 18$\approx 2.9$ to 19$3.1\text{ kN}$

Automotive components20

Electric motors21

Industrial machinery22

Household appliances (like washing machines)23

Skateboards and bicycles24