Timken46780/46720BTapered Roller Bearing Assembly, TSF Flanged Cup – 6.2500 in ID, 8.875 in OD, 1.6250 in Width, Series 46700

Product Description

What this part is

Timken 46780/46720-B is an inch-series tapered roller bearing assembly in the TSF configuration — Tapered Single with Flange. Series: 46700. Bore: 6.2500 in (158.750 mm). Outside diameter: 8.875 in (225.425 mm). Total assembly width: 1.6250 in (41.275 mm). Inner ring width (B): 1.5625 in (39.688 mm). Outer ring width (C): 1.3125 in (33.338 mm).

Decoding the designation

Cone part number: 46780. Cup part number: 46720-B. The B on the cup designates the flanged cup. A flanged cup locates axially against the face of a through-bored housing, so the housing needs no machined backing shoulder. Outer ring flange O.D. (D1): 9.0898 in (230.881 mm). Outer ring flange width (C2): 0.2188 in (5.558 mm). Precision Class: Not specified.

What these specs mean in practice

Dynamic radial load rating C1, at 1 million revolutions: 68,200 lbf (303,000 N). Dynamic radial load rating C90, at 90 million revolutions: 17,700 lbf (78,600 N). Dynamic axial rating Ca90: 11,600 lbf (51,600 N). Static radial load rating C0: 143,000 lbf (635,000 N). K factor: 1.52. e factor: 0.38. Y factor: 1.57. The K factor of 1.52 fixes the ratio of radial to thrust capacity set by the raceway angle, and the e and Y factors convert a combined radial and thrust load into the equivalent radial load used for life calculation.

Quantity and configuration

One assembly, two pieces: one 46780 cone carrying the rollers and cage, and one 46720-B flanged cup. Single row. Rolling elements: tapered rollers. Cage: stamped steel. Open, unsealed. Effective centre location: 0.1 in (2.5 mm) outside the cone backface.

Mounting dimensions

Shaft backing shoulder diameter, frontface (da): 6.65 in (169 mm). Shaft backing shoulder diameter, backface (db): 6.93 in (176 mm). Housing backing shoulder diameter, frontface (Da): 8.63 in (218.95 mm). Maximum shaft fillet radius: 0.14 in (3.600 mm). Maximum housing fillet radius: 0.130 in (3.30 mm). Cage location relative to frontface (Ab): 0.12 in (3 mm). Weight: 11.400 lb (5.2 kg).

Fitting notes

Cone and cup mount as a pair. Bearing setting is made by axial adjustment against the opposing row or by shim, and the K factor governs the induced thrust reaction. G1 factor: 572. G2 factor: 133. Geometry factor Cg: 0.143, used in the lubrication life adjustment factor a3l. Lubrication: oil or grease.

Interchange guidance

Searchable forms of the designation: 46780/46720B, 46780-46720-B, 46780 46720 B, 46720-B, 46720B, 46780. The unflanged cup that runs on the same cone is the 46720, a related size with no locating flange and a different housing fit.