Timken81593Tapered Roller Bearing Single Cone – 5.9375 in Bore, 1.9687 in Width, Series 81000, Matching Cups 81962 and 81962X

Product Description

What this part is

Timken 81593 is an inch-series tapered roller bearing cone — the inner ring with its tapered roller and cage assembly. Series: 81000. Bore: 5.9375 in (150.813 mm). Inner ring width (B): 1.9687 in (50.005 mm). Bore form: straight. Cone only. The matching cups are the Timken 81962 and the Timken 81962X.

Decoding the designation

Base number: 81593. Series: 81000. Design units: inch. Precision Class: Not specified — the designation carries no class suffix. Bearing material: bearing steel. The 81962X cup differs from the 81962 in its outer geometry while running the same raceway, so both are published as mates for this cone.

What these specs mean in practice

Ratings below are per row, for the 81593 cone running against a matching cup. Dynamic radial load rating C1, at 1 million revolutions: 90,300 lbf (402,000 N). Dynamic radial load rating C90, at 90 million revolutions: 23,400 lbf (104,000 N). Dynamic axial rating Ca90: 14,100 lbf (62,700 N). Static radial load rating C0: 134,000 lbf (595,000 N). K factor: 1.66. A K factor of 1.66 comes from a shallow raceway angle, which biases the row toward radial capacity: C90 at 23,400 lbf is well above Ca90 at 14,100 lbf.

Quantity and configuration

One piece: one 81593 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: –0.21 in (–5.3 mm), inside the cone backface.

Mounting dimensions

Shaft backing shoulder diameter, frontface (da): 6.46 in (164.1 mm). Shaft backing shoulder diameter, backface (db): 6.65 in (168.9 mm). Maximum shaft fillet radius: 0.14 in (3.600 mm). Cage location relative to backface (Aa): 0.31 in (7.9 mm). Cage location relative to frontface (Ab): 0.03 in (0.8 mm). Weight: 36.99 lb (16.779 kg). Timken records a non-standard shoulder design on this cone, and the shoulder detail is held in the factory drawing rather than in the published dimension table.

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: 413. G2 factor: 98.4. Geometry factor Cg: 0.125, used in the lubrication life adjustment factor a3l. Lubrication: oil or grease. Operating range: –54 °C to 120 °C.

Interchange guidance

Searchable forms of the designation: 81593, 81593 cone, Bower 81593. Matching single cups: 81962 and 81962X, each sold separately and each giving the published per-row ratings. Bower is a legacy tapered roller brand now within Timken, and Bower-marked 81593 cones carry the same designation and envelope.