Deep groove ball bearing 6328-M-C4 is a single row radial bearing with a solid brass cage (M), bore diameter 140.0 mm, outside diameter 300.0 mm and width 62.0 mm. Net mass is 21.767 kg. The limiting speed is 3850.0 1/min, with a reference speed of 3250.0 1/min. Radial internal clearance is C4 (Group 4), which is wider than standard clearance. The solid brass cage gives the bearing stability at the stated speed values and allows reliable ball guidance under higher operating temperatures compared to pressed cage designs. The C4 internal clearance compensates for thermal expansion and interference fit conditions, keeping the bearing free of excessive preload once operating temperature is reached. As a single row deep groove ball bearing, it carries radial load together with moderate axial load in both directions, and the open design (bore type Z) requires external sealing and a separate lubrication arrangement suited to the reference and limiting speed values given.