The cylindrical roller bearing NU307R (commonly manufactured by brands like KOYO) features a standard 35 mm inside diameter, 80 mm outside diameter, and a width of 21 mm. 
Key Dimensions & Specifications
  • Inside Diameter (ID): 35 mm
  • Outside Diameter (OD): 80 mm
  • Width: 21 mm
  • NU: Single-row design featuring two integral flanges on the outer ring and a completely flangeless inner ring. This configuration allows the inner ring to separate and accommodates axial displacement in both directions