623ZZ Ball Bearing - 3x10x4mm - Pack of 5

Description
Ball bearings help to reduce friction in 3D printer. It usually used in combination with timing belts.
Flange mounted bearings are used when the shaft axis is perpendicular to the bearing mounting surface. 
These ball bearings are suitable for both radial and axial movements at high speeds. They incorporate a sealed bearing that is preassembled into a flanged housing. The housing contains a precision ground surface perpendicular to the bearing axis and two, three or four mounting holes, depending on the style. Some typical applications for these bearings: Hold the (Z-axis) screws in place, supporting and guiding the movements of timing belt systems and reduce turning friction (eg in cold ends).

Features:
Model: F623ZZ  
    Size: 3mm x 10mm x 4mm
    Outer Diameter: 10mm
    Inner Diameter: 3mm
    Thickness: 4mm
Model: F624ZZ  
    Size: 4mm x 15mm x 5mm
    Outer Diameter: 15mm
    Inner Diameter: 4mm
    Thickness: 5mm
Model: F625ZZ  
    Size: 5mm x 18mm x 5mm
    Outer Diameter: 18mm
    Inner Diameter: 5mm
    Thickness: 5mm
Model: F688ZZ  
    Size: 8mm x 16mm x 5mm
    Outer Diameter: 16mm
    Inner Diameter: 8mm
    Thickness: 5mm
Model: F604ZZ
    Size: 4mm x 13mm x 4mm
    Outer Diameter: 13mm
    Inner Diameter: 4mm
    Thickness: 4mm