Rolling bearings are classified by size
Imported bearings are classified according to their outer diameter size:
Miniature bearings - bearings with a nominal outside diameter range of 26 mm or less.
Small bearings - bearings with a nominal outside diameter range of 28-55 mm.
Small and medium-sized bearings – bearings with a nominal outside diameter range of 60-115 mm.
Medium and large bearings - bearings with a nominal outside diameter range of 120-190mm.
Large bearings - imported bearings with a nominal outside diameter range of 200-430mm.
Extra large bearings - bearings with a nominal outside diameter range of 440 mm or more.
