This single row cylindrical roller bearing carries two ribs on the outer ring and one rib on the inner ring, giving it a semi-locating function that allows axial displacement of the non-ribbed ring while still guiding the shaft in one direction. Bore diameter is 50.0 mm, outside diameter 90.0 mm, width 20.0 mm, netto mass 0.552 kg. The rollers run in a solid brass cage (M1), and the internal design (E) provides increased roller complement for higher load capacity. Limiting speed is rated at 14500 1/min, with a reference speed of 6600 1/min. Radial internal clearance is C3, wider than normal, which compensates for interference fits and thermal expansion during operation. The separable inner and outer rings simplify mounting and dismounting, and the semi-locating arrangement suits applications where one bearing position must accommodate axial shaft movement while radial loads are carried at both ends. As an open type, relubrication with grease or oil is required according to the operating conditions and duty cycle.