Timken 552A Tapered Roller Bearing Cup Outer Race

The Timken 552A Tapered Roller Bearing Cup (Outer Race) is a precision single‑cup outer race designed to mate with Timken tapered roller bearing cones to support heavy combined radial and axial loads. As part of Timken’s 550 Series, this inch‑unit outer race (MPN 552A) is compatible with Timken cones 555‑S, 557, 557A, and 558A and delivers reliable rotational performance in demanding equipment. The cup’s outside diameter is 4.8750 in (123.825 mm) and its width is 1.1875 in (30.163 mm), with a weight of 4.0 lb (1.8 kg). Its separable design simplifies installation and service, helping maintain accurate shaft alignment and long service life in industrial gearboxes, rolling mills, mining equipment, construction machinery, and heavy‑duty power transmission systems. Design units are inch (imperial), and the housing geometry includes a maximum fillet radius of 0.130 in (3.30 mm) with housing backing shoulder diameters Da of 4.60 in (116.10 mm) and Db of 4.29 in (108.97 mm).