A single row deep groove ball bearing with a bore diameter of 90.0 mm, outside diameter of 190.0 mm, and width of 43.0 mm, weighing 5.4 kg. The design features shields on both sides (2Z) and a steel sheet metal cage (JN). Radial internal clearance is CN (Group N), the standard clearance class. The limiting speed is rated at 4150 1/min, with a reference speed of 5100 1/min. The shields protect the raceway and balls from dust and coarse contaminants while retaining the factory-applied grease fill, making this bearing suited for applications where relubrication access is limited. Standard CN clearance and steel cage construction support radial loading at moderate to higher rotational speeds within the stated limits. Dimensionally and constructionally equivalent to SKF 6318-2Z, NSK 6318ZZ, and NTN 6318ZZ.