This deep groove ball bearing carries radial and moderate axial loads through a single row of balls running in a 105.0 mm bore, 225.0 mm outside diameter, 49.0 mm width housing, with a net mass of 8.7 kg. The design uses a steel sheet metal cage (JN) and a bore type Z, allowing a limiting speed of 4050.0 1/min and a reference speed of 4450.0 1/min. The radial internal clearance is increased to C3 (Group 3), compensating for thermal expansion under load and allowing stable operation where shaft and housing fits generate tighter interference than standard clearance permits. The single-row ball arrangement keeps friction low, and the sheet metal cage supports higher rotational speeds within the stated limits. Dimensionally and constructionally equivalent to SKF 6321/C3, NSK 6321C3, and NTN 6321C3.