6004 bearing is a deep groove ball bearings, the 6004 Bearing inner diameter is 20mm, the 6004 Bearing outer diameter is 42mm and the 6004 Bearing width is 12mm, this is a popular size that could be used in many applications, the bearing dimensions are 20mm x 42mm x 12mm, 20*42*12 mm, the 6004 bearing can be open, rubber sealed or metal shielded, that depends on your application. That includes 6004-2RS, 6004ZZ and 6004-2Z.
6004 bearing is a deep groove ball bearings, the 6004 Bearing inner diameter is 20mm, the 6004 Bearing outer diameter is 42mm and the 6004 Bearing width is 12mm, this is a popular size that could be used in many applications, the bearing dimensions are 20mm x 42mm x 12mm, 20*42*12 mm, the 6004 bearing can be open, rubber sealed or metal shielded, that depends on your application. That includes 6004-2RS, 6004ZZ and 6004-2Z. the inner diameter is referred as the bore of the bearing and also know as ID of the bearing, the outer diameter is known as OD, the "width" is also known as height of the ball bearing. the 6004 bearing rpm (revolution per minute) average between 17000 to 20000 rpm, the 6004 bearing weight is about 69 grams. 6004 bearing is categorized as single row deep groove ball bearings that can mainly take radial loads, the closures of the bearing can be chosen according to the environment around the bearing, electric motors usually take metal shield closures with grease lubrication, automotive application usually take rubber seal closures with grease lubrication. the most common ball retainer is made of steel, however, some application require nylon cage for higher speeds.