The SKF 6317 is a single - row deep - groove ball bearing without a sealing structure. It has an inner diameter of 85mm, an outer diameter of 180mm, and a thickness of 41mm. Made of GCr15 high - carbon chromium bearing steel with a pressed - steel cage, it is suitable for medium - to - high - speed and medium - to - heavy - load operations in dry and clean environments, such as on machine tool spindles, motor rotor shafts, and industrial fan shafts. It can withstand radial and bidirectional axial loads, offering advantages like a low friction coefficient, good speed adaptability, and a long service life.