This 28 x 12 x 8mm 6001Z miniature ball bearing is a single-row bearing for supporting radial loads
The dimensions of this bearing make it suitable for use in skateboards, inline skates, and scooters, among others
Rolling bearings use rolling elements to maintain the separation between moving parts to reduce rotational friction and support radial and axial loads
The bearing is made of carbon steel for durability and resistance to deformity under heavy loads, and is shielded to keep lubricant in and contaminants out
All rolling bearings are open, shielded, or sealed. Sealed bearings are lubricated with oil or grease in the bearing factory, while open and shielded bearings are meant to be lubricated in place, with periodic reapplication of lubrication, based on use