Drawn Cup Needle Roller Bearings type is composed of an outer ring drawn from a thin steel plate by precision drawing, needle rollers and a cage assembled in the outer ring after the raceway surface thereof was hardened (A bearing marked with a suffix including M is subjected to heat-treatment after assembly). Of the bearings with outer ring, this bearing type is a bearing with the smallest section height which enables space-saving and cost-saving. Usually design is so made as to use a shaft as the direct raceway surface without using inner ring. The outer ring of this bearing type is of such a construction that the needle rollers and the cage are not separated from one another, so that the bearing is only press-fitted in a rigid housing with proper fit torque. Thus, this bearing type needs no snap ring, etc. to fix itself in axial direction and, in addition, is easy to handle. NTN Needle Roller Bearing, Drawn Cup, Series: HK Series, 12 mm Bore Dia, 18 mm Outside Dia, 1 Row, 12 mm W, Open Closure, 7300 N, Steel Bearing, Steel Cage, 13000 RPM Grease/20000 RPM Oil Maximum, -40 to 120 °C