Timken 558A Single Row Tapered Roller Bearing Cone

The Timken 558A is a single-row tapered roller bearing cone designed to support heavy combined radial and axial loads in demanding industrial and mobile equipment, featuring a separable cone design that simplifies installation and maintenance and mates with the Timken 552A bearing cup. As part of the 555 Series, this inch-based cone has a bore of 2.3750 in (60.325 mm), inner ring width of 1.4440 in (36.678 mm), and an overall width of 1.5000 in (38.100 mm when used with the 552A cup), and it weighs 9.28 lb (4.21 kg) with a stamped steel cage. Key ratings include dynamic radial load C90 11,100 lbf (49,400 N) and C1 42,900 lbf (191,000 N), dynamic axial load Ca90 6,590 lbf (29,300 N), and static radial load C0 55,700 lbf (248,000 N); the maximum shaft fillet radius is 0.140 in (3.600 mm), with shaft backing shoulders frontface da 2.72 in (69 mm) and backface db 2.99 in (76 mm), and an effective center location of -0.37 in (-9.4 mm). Common applications include industrial gearboxes, rolling mills, mining equipment, construction machinery, and heavy-duty power transmission systems, with mating compatibility to Timken 552A cups.