Bearings, Plain, Unmounted
FSC 3120: Bearings, Plain, Unmounted
Federal Supply Class (FSC) 3120 covers unmounted plain bearings, meaning sleeve and journal bearings supplied without a housing. These NSN items support shafts and pivots across machinery.
Plain bearings support rotating or sliding shafts through a low-friction sliding surface. They handle high loads and tolerate shock and contamination well.
Common types include sleeve bearings, bushings, thrust washers, and journal bearings. They are made from bronze, babbitt, and self-lubricating composite materials.