Sealed on both sides of the bearing to retain lubricant. Suitable for complex environments Durability and resistance to deformation under heavy loads Z1 noise level for most general uses Pre-lubricated, easy to maintain Deep groove ball bearings are one of the most widely used bearings. They are used to support radial and axial loads in both directions. Suitable for all types of industrial equipment, mini motors, rotary motors, office equipment, etc. With low friction and high limiting speed, deep groove ball bearings are economical and require little maintenance. Better hardness than chrome steel bearings after quenching. Economical bearings are widely used in areas where Mohs hardness is not very demanding. Normal precision, pre-lubricated, single row. Model: 698- Sealed Type: Double Sealed Heat Treatment: Quenching Hardness: HRC50-55 Accuracy Class: P0 (ABEC-1) Noise Level: Z1 Weight: 219g Color: Silver + Black Material: Carbon Steel Size: Inner Diameter (d): 8mm Outer Diameter