Timken48385-90098Tapered Roller Bearing TDO Assembly – 5.2500 in Bore, 7.5000 in Outside Diameter, 3.3750 in Overall Width, Class 3 Precision, Case-Carburized Steel

Product Description

What this part is:

Timken 48385-90098 tapered roller bearing assembly — a TDO (tapered double outer) two-row set built from two 48385 cones, one 48320-D double cup and one X1S-48385 cone spacer. Brand: Timken. Manufacturer Part Number: 48385-90098. Cone Part Number: 48385. Cup Part Number: 48320-D. Base Number: 48385. Series: 48300 inch tapered. Bore Diameter: 5.2500 in (133.35 mm). Outside Diameter: 7.5000 in (190.5 mm). Overall Width: 3.3750 in (85.725 mm). Cup Width: 2.8750 in (73.03 mm). Cone Width: 1.5625 in (39.688 mm). Number Of Rows: 2. Rolling Elements: Tapered Roller. Bore Type: Straight. Closure Type: Open. Precision Class: Class 3. Bearing Material: Case-carburized alloy steel. Design Units: Imperial. Item Weight: 7.42 kg (16.36 lb). Mounting Arrangement: TDO, indirect mount.

Decoding the designation:

48385 — the cone number in Timken’s 48300 inch tapered series, giving a 5.2500 in bore.

48320-D — double cup: one outer race carrying both cup raceways, so the two cone rows share a single housing seat.

D on a cup — double cup, taking two cones.

X1S-48385 — the cone spacer that sets the axial position of the two cones inside the double cup.

-90098 — the Timken assembly number for this cone, cup and spacer combination supplied as one pre-set unit.

*3 — Precision Class 3: a tighter tolerance than standard, giving lower running vibration and closer shaft location. Written on cartons as *3, #3 or -3.

Listing search forms: 48385-90098, 48385 90098, 48385/48320D, 48385 *3, 48385 #3, 48385-3, Class 3 precision.

What these specs mean in practice:

Dynamic Load Rating: 492,000 N two-row. Static Load Rating: 542,000 N per row. Dynamic Radial Rating C90: 73,300 N per row. Two-Row Dynamic Radial Rating C90-2row: 128,000 N. Dynamic Axial Rating Ca90: 40,300 N. e Factor: 0.32. K Factor: 1.82. Y1 Factor: 2.1. Y2 Factor: 3.13.

A K factor of 1.82 is a shallow inch taper, so the set carries a high radial load for its thrust capacity. The TDO form places the two rows back to back with the load lines diverging outward, which gives a wide effective bearing spread and high resistance to overturning moments from one bearing position. Class 3 precision holds the bore, outside diameter and running accuracy to a tighter band than standard, which shows up as lower running vibration and closer control of shaft location.

Mounting data:

Max Shaft Fillet Radius: 3.5 mm. Shaft Backing Shoulder Diameter (db): 148 mm. Max Housing Fillet Radius: 0.8 mm. Housing Backing Shoulder Diameter (Da): 184 mm. The cones seat on a straight shaft journal and the double cup locates in a single housing bore. Internal setting is fixed by the X1S-48385 spacer supplied with the set, so the assembly mounts without a bench adjustment.

Quantity and configuration:

Unit Quantity: 4 Pcs. The sale unit is one complete 48385-90098 assembly: two 48385 cones, one 48320-D double cup and one X1S-48385 cone spacer.

Interchange guidance:

48385 and 48320-D are industry-standard inch tapered numbers built to the same ANSI/ABMA boundary dimensions by several manufacturers, so same-number substitution is valid on geometry. Cross-references are listed in the attribute table. The 48320-DC is a related double cup on the same envelope and the 48393 is a related cone running against the same double cup at a larger bore; both are different parts.