This is a single row deep groove ball bearing with a bore diameter of 30.0 mm, outside diameter of 72.0 mm, and width of 19.0 mm, weighing 373.89 g. It is fitted with steel sheet metal shields on both sides and a steel sheet metal cage (JN), giving it a closed design that keeps out coarse contamination while allowing regreasing through the shield gap. The radial internal clearance is C4 (Group 4), wider than standard, which compensates for temperature-related fit tightening during operation. Limiting speed is rated at 11700.0 1/min, with a reference speed of 10500.0 1/min. The C4 clearance combined with shielded protection makes this bearing suited for applications where shaft and housing fits generate additional preload or where operating temperatures rise above ambient, since the extra internal play prevents excessive tightness under such conditions. The steel sheet metal cage supports stable ball guidance at the stated speed range, while the shields protect the raceways without providing a full seal, so relubrication intervals should follow the exposure level of the surrounding environment.