HC209-27 bearing is Eccentric bore with (cam) locking collar set screw, NA209-27 Insert Bearing has a combination of a standard lubrication feature that has a drilled hole in the groove on the locking collar and to make things more efficient the drilled oil hole opposite to the collar to make it interchangeable with the different manufactures.
Sizes: ID 1-11/16" inch x OD 85mm x W 22mm
Match#: UG209-27, EX209-27, UEL209-111D1, EW209-27S, 1045-1-11/16DECG, NA209-27, G1111KRRB, R-111, GY1111KRRB, INS-SXR-111, VE-227, YG227NL, YEL209-111, YW220-1-11/16, R-27E
HC200 Series Insert Bearing is self aligning for standard load capacity. This specific bearing has an eccentric cam locking collar for the attachment of the shaft.