Specification:Name: Deep Groove Ball BearingMaterialCage: PA66 NylonBalls: High Strength Glass BallInner and Outer Ring: POM PlasticNumber of Scrolling Columns: Single ColumnModel: 603 604 605 605 606 608 609 623 624 625 626 627 628 to 699Size: ID x OD x Thickness (ID=Inner Diameter; OD=Outer Diameter)603 3x9x3mm (Model=603; Inner Diameter=3mm; Outer Diameter=9mm; Thickness=3mm)Features:1.Paraformaldehyde (POM) is known as "super steel" or "race steel", also called polyoxymethylene. It can be used normally in environments as much as 90°C. High fatigue strength.2.Good corrosion resistance, able to resisting all kinds of corrosive media and organic media in the vary of temperature and concentration.3.Good self-lubrication and high wear resistance,Strong resistance to adhesion.4.Extremely low water absorption and perfect electrical insula.Package:Packing : Plastic bag / Carton box.Quantity : According in your Choose!