TimkenLM603049 90033Double 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

A Timken -90xxx suffix marks a factory matched assembly rather than a loose component. 2TS is two tapered single rows; IM is indirect mount, the back-to-back arrangement. LM603049 is the cone number, LM603011 the cup. The spacers follow Timken’s spacer convention: LM603049XF is the cone spacer, sitting between the two inner rings, and LM603011EX is the cup spacer, sitting between the two outer rings.

Quantity and configuration

2 × LM603049 cone (inner ring with rollers and cage)
2 × LM603011 cup (outer race)
1 × LM603049XF cone spacer
1 × 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, so the assembly needs no shim-and-measure setting procedure. Class 2 is a tighter tolerance grade than the standard Class 4 / Class K.

Published dimensions

Bore: 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: Timken Class 2
Rows: 2, indirect (back-to-back) mount
Cage: pressed steel
Material: chrome alloy bearing steel

Interchange guidance

The same 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 × 3.0625 × 0.7812 in.