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NA, Machined Type Needle Roller
NA Machined Type Needle Roller Bearing with Inner Race (NA Series) The NA series, originally introduced by Torrington, features a caged roller assembly for maximum speed capacity, and comes with an inner race. Its machined outer shell and caged needle rollers ensure positive radial retention, even during repeated shaft removals for servicing. These needle bearings require hardened shafting or inner rings for optimal performance.