Item Type: One Way Bearing_x000D_Material: GCr15 bearing steel_x000D_Model: CSK40PP_x000D__x000D_Inner Diameter: Approx. 40mm / 1.6in_x000D__x000D_Outer Diameter: Approx. 80mm / 3.1in_x000D__x000D_Thickness: Approx. 18mm / 0.7in 1Can rotate freely in one direction, while locked in the other direction is one-way bearing. 2Made of GCr15 bearing steel material, heat?treated hardness HRC61?65, strong and durable. 3The bearing is small in size and has high load capacity, and there is enough space for storing grease. 4Powder metallurgy one?way bearings and one?way bearings can completely "lock up" the drive shaft when it receives driving force. 5Can be used in textile machinery, printing machinery, automotive industry, household appliances, etc.1 x One WayBearing