Radial Ball Bearing 623ZZ for 3D Printer This Radial Ball Bearing 623ZZ for 3D Printer/ Robot is a 3x10x4 mm Double Shielded Ball Bearing with 623ZZ ABEC-3 quality, 623ZZ Bearings are the popular item that could be used in many application that uses this size 3x10x4 mm bearings, each 623ZZ bearings are closed with 2 Metal Shields, one Shield from each side, to protect the bearing from dust or any possible contamination. Bearings come in various qualities. We have carefully selected the best quality bearings from numerous suppliers. This means our bearings are meant for continuous use and they’ll last longer than other cheap bearings. Ideal for use in your 3D Printer, CNC project, or robot. It’s needed for most types of RepRap 3D printers. Our bearings come pre-lubricated from the manufacturer so that no additional lubrication is required to be applied. These protect the bearing from dust or any possible corrosion. Check out the entire range of Bearings Applications: Mostly used for 3D printer wheel bearings, CNC, etc. Fit for skateboards, inline skates, roller skates, scooters, and other skating applications.