Timken67887Tapered Roller Bearing Single Cone – 7.5625 in Bore, 1.8438 in Width, Series 67800, Matching Cups 67820 and 67830

Product Description

What this part is

Timken 67887 is an inch-series tapered roller bearing cone — the inner ring with its tapered roller and cage assembly. Series: 67800. Bore: 7.5625 in (192.088 mm). Inner ring width (B): 1.8438 in (46.833 mm). Bore form: straight. Cone only. The matching cups are the Timken 67820 and the Timken 67830.

Decoding the designation

Base number: 67887. Series: 67800. Design units: inch. Precision Class: Not specified — the designation carries no class suffix. Bearing material: case-carburized steel, which gives a hard raceway over a tough core and suits the shock loading these large inch sections see in axle, mill and gearbox positions.

What these specs mean in practice

Ratings below are per row, for the 67887 cone running against a matching cup. Dynamic radial load rating C1, at 1 million revolutions: 93,600 lbf (416,000 N). Dynamic radial load rating C90, at 90 million revolutions: 24,300 lbf (108,000 N). Dynamic axial rating Ca90: 19,800 lbf (88,200 N). Static radial load rating C0: 188,000 lbf (835,000 N). K factor: 1.22. A K factor of 1.22 sits mid-range, giving a balanced split between radial and thrust capacity rather than favouring either.

Quantity and configuration

One piece: one 67887 cone, comprising the inner ring, the tapered rollers and the cage. Single row. Rolling elements: tapered rollers. Cage: stamped steel. Open, unsealed. Effective centre location: 0.4 in (10.2 mm) outside the cone backface.

Mounting dimensions

Shaft backing shoulder diameter, frontface (da): 8.03 in (204 mm). Shaft backing shoulder diameter, backface (db): 8.78 in (223 mm). Maximum shaft fillet radius: 0.410 in (10.400 mm). Cage location relative to backface (Aa): 0.18 in (4.6 mm). Cage location relative to frontface (Ab): 0.11 in (2.8 mm). Weight: 34.29 lb (15.553 kg).

Fitting notes

Cones of this type mount in opposing pairs on a shaft, and the bearing is set by axial adjustment or shim against the opposing row. G1 factor: 727.9. G2 factor: 146.6. Geometry factor Cg: 0.131, used in the lubrication life adjustment factor a3l. Lubrication: oil or grease. The 0.410 in maximum shaft fillet radius is unusually generous for the section, so a large-radius shaft undercut is cleared by the cone corner.

Interchange guidance

Searchable forms of the designation: 67887, 67887 cone, Bower 67887. Matching single cups: 67820 and 67830, each sold separately and each giving the published per-row ratings. Bower is a legacy tapered roller brand now within Timken, and Bower-marked 67887 cones carry the same designation and envelope.