TimkenDouble Row Tapered Roller Bearing Assembly 1.7812″ Bore x 3.0625″ OD, Back-to-Back with Spacers, Class 2

Product Description

What this part is

A Timken LM603049-90033 complete matched tapered roller bearing assembly — two single-row bearings preset back to back with an inner-ring spacer and an outer-ring spacer. Inch (imperial) series, 2TS-IM configuration, Timken precision Class 2. Supplied as the full assembly, six pieces.

Decoding the designation

-90xxx — a Timken suffix marking a factory matched assembly rather than a loose component.

2TS — two tapered single rows.

IM — indirect mount, the back-to-back arrangement.

LM603049 — the cone number.

LM603011 — the cup number.

LM603049XF — the cone spacer, sitting between the two inner rings.

LM603011EX — the cup spacer, sitting between the two outer rings.

Quantity and configuration

Unit Quantity: 6 Pcs. Contents: two LM603049 cones (inner ring with rollers and cage), two LM603011 cups (outer race), one LM603049XF cone spacer and one LM603011EX cup spacer. Six pieces per assembly.

What these specs mean in practice

Back-to-back mounting sets the two effective load lines apart from each other, which gives a wide effective bearing spread and stiff resistance to moment load from a short shaft section — the standard arrangement for pinion heads and small wheel ends. Because the spacers are ground to size at the factory, the axial internal clearance is fixed when the rings are clamped. Class 2 is a tighter tolerance grade than the standard Class 4 / Class K.

Mounting data

Bore Diameter: 1.7812 in (45.24 mm). Outside Diameter: 3.0625 in (77.79 mm). Cone Width (each row): 0.7812 in (19.84 mm). Cup Width (each row): 0.5937 in (15.08 mm). Precision Class: Class 2. Number Of Rows: 2, indirect (back-to-back) mount. Cage: pressed steel. Material: chrome alloy bearing steel.

Interchange guidance

The LM603049 cone and LM603011 cup are also supplied as a 2TS-DM direct-mount assembly using the LM603011EB spacer, and as a different 2TS-IM pairing using the LM603049XB spacer. Those are related configurations with a different spacer set and a different mount direction, so they are not interchangeable with a -90033. A single LM603049/LM603011 TS bearing is one row of this assembly, measuring 1.7812 x 3.0625 x 0.7812 in.