Type: 624ZZ Ball Bearings
Item: Double Shielded Ball Bearings 624ZZ Bearings
Quality: ABEC-5
624ZZ Size: 4mm x 13mm x 5mm
ID (inner diameter) Bore=4mm
OD (outer diameter)=13mm
Width/Height/Thickness=5mm
Dynamic load rating Cr: 1,300 N
Static load rating Cor: 490 N
Grease Lubrication: 44,000 RPM
Also know as 624Z Ball Bearing. It's needed for all most all types of Reprap 3D printers.