Sealed on BOTH SIDES of the to keep lubricant in. Suitable for complex environmentdurability and resistance to deformity under heavy loadsZ1 Noise Level for most general use-Lubricated, Easy to maintainDeep Groove are one of the most widely used rolling bearings. They are used to accommodate and axial loads in both directions.Suitable for all kinds of industrial equipment, Mini motor, small motor, office equipment and so on.With small friction and high-limit speed,Deep Groove are cost-effective and require little maintenance.better in toughness than chrome steel bearings after quenching. These cost-effective bearings are widely used in areas with low requirements for Mohs hardness.Single-, -lubricated, normal accuracy.Model: 698-Sealed Type: Double SealedHeat Treatment: QuenchingHardness: HRC50-55Accuracy Class: P0 (ABEC-1)Noise Level: Z1Weight: 73gcolour:Silver + blackMaterial:Carbon steelsize:Inner Diameter (d): 8mmOuter Diameter (D): 19mmThickness (B): 6mmPackage Contents:10*Deep groove raceway NOTE refer to the picture and select right type of bearings your order (Sealed or on BOTH or SINGLE side of the ). Suffix on the just for differentiating between Sealed and type of . It would not affect the use of product.Only the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.