FAGK48190Tapered roller bearing single cone – 4.2500 in bore, 1.3750 in inner ring width, inch series, pressed steel cage, case-carburized steel, standard precision

Product Description

What this part is

The 48190 is a single cone for an inch-series tapered roller bearing — the inner ring together with its full complement of tapered rollers and the cage that holds them, supplied as one non-separable assembly. Bore is 4.25 in (107.95 mm) and inner ring width is 1.3750 in (34.925 mm). Weight is 5.2 lb (2.3 kg).

Quantity and configuration

Cone only. The matching cup is the 48120.

Decoding the designation

Inch-series tapered roller numbering assigns each cone its own part number rather than encoding dimensions, so 48190 identifies this bore, raceway angle and roller set. The K prefix used by FAG marks the part as the cone half of the bearing. With no precision suffix the cone is standard precision, ANSI/ABMA Class 4, and with no D suffix it is a single cone rather than a one-piece double cone.

Load ratings and what they mean

Dynamic radial load rating is 43,200 lbf (192,000 N) at one million revolutions on the ISO method, and 11,200 lbf (49,800 N) at ninety million revolutions on the Timken method — the same bearing expressed on two different life bases, which is why the two figures differ by roughly four times. Dynamic axial rating on the ninety-million basis is 9,680 lbf (43,100 N) and static radial rating is 69,200 lbf (308,000 N). The K factor of 1.16 is the radial-to-thrust rating ratio for this raceway geometry: a value near 1.1 marks a steeper contact angle than the common 1.5 to 1.6 designs, so this cone carries a proportionally larger share of thrust for the same radial load.

Shaft seat and abutment dimensions

Shaft backing shoulder diameter is 4.57 in (116 mm) at the front face and 4.8 in (122 mm) at the back face, and the largest shaft fillet radius the cone corner will clear is 0.14 in (3.560 mm). Effective centre location sits 0.15 in (3.8 mm) from the reference face. Cage clearance is 0.09 in (2.3 mm) relative to the back face and 0.07 in (1.8 mm) relative to the front face, which sets the space a seal or spacer needs to leave clear.

Material and construction

Case-carburized alloy steel inner ring and rollers with a ground raceway and a pressed steel cage. The carburized case over a tough core is what gives tapered roller components their tolerance of shock loading and momentary edge contact.

Fitting notes

The cone is pressed or heat-fitted onto the shaft seat with force applied to the cone back face, and it seats against the shaft shoulder within the published backing diameters. Rollers and cage remain captive on the cone throughout handling. Running setting is established afterwards by axial adjustment against the opposing bearing in the mounting.

Interchange guidance

The same cone is catalogued as Timken 48190, SKF 48190 and Koyo 48190, and the complete single-row assembly is written 48190/48120. Related parts on the same number: 48190-3 is the Class 3 precision version and 48190D is a one-piece double cone that runs against two single cups, both different parts rather than substitutions.