FAGK43096/43319DDouble-Row TDO Tapered Roller Bearing Assembly, 0.960 in Bore x 3.1875 in OD x 2.1875 in Wide, Two Cones in One Double Cup

Product Description

What this part is

This is a two-row tapered roller bearing in the TDO configuration, Tapered Double Outer. Two 43096 cone assemblies run in a single wide 43319D double cup. Bore is 0.9600 in (24.384 mm), cup outside diameter 3.1875 in (80.963 mm), overall width across the cone backfaces 2.1875 in (55.563 mm). Stamped steel cages, inch design units, 43000 series.

Decoding the designation

K — FAG’s prefix marking an inch-series tapered roller designation.

43096 — the cone number in the 43000 inch series, which sets the 0.9600 in bore.

43319D — the cup number, where the trailing D means double cup: one wide outer ring carrying two opposed raceways, which is what makes this a two-row bearing.

TDO — the resulting arrangement, two rows back-to-back inside the double cup.

Published dimensions and factors

Bore (d): 0.9600 in / 24.384 mm. Cup outside diameter (D): 3.1875 in / 80.963 mm. Assembly width across cones (T): 2.1875 in / 55.563 mm. Cone width (B), each: 0.9478 in / 24.074 mm. Double cup width (C): 1.5625 in / 39.688 mm. e factor 0.67. K factor 0.87. Y1 1.01. Y2 1.5. Number of rows: 2. Rolling elements: tapered rollers, two rows. Design units: inch. Unit Quantity: 1 Pc, comprising two 43096 cones and one 43319D double cup.

43096 and 43319D are industry-standard inch designations rather than FAG-proprietary numbers, so the boundary dimensions and calculation factors above are fixed by the standard and a FAG part interchanges dimensionally with any maker’s.

What the K factor of 0.87 tells you

K is the ratio that follows from the cup angle, and 0.87 is low, well under the 1.5 to 1.8 typical of general-purpose tapered roller bearings. A low K means a steep cup angle, and a steep cup angle means the bearing is built to take thrust. Combined with the high e factor of 0.67, this is a bearing whose design intent is heavy axial load with a comparatively modest radial component. In a TDO arrangement, where thrust is taken in both directions, that makes it a locating bearing, holding a short shaft axially against reversing loads.

The effective centre location is negative at −0.08 in. The load line crosses the bearing axis inside the cone backface, so for a back-to-back pair the two load lines cross close together and the effective bearing spread is narrow. The arrangement holds position and reversing thrust rather than reacting a large overturning moment.

Quantity and configuration

Each unit is one bearing: two 43096 cones plus one 43319D double cup.

Mounting data

Cone backface backing diameter (db): 1.59 in / 40.5 mm. Cup frontface backing diameter (Da): 2.94 in / 73.91 mm. Maximum cone backface fillet radius cleared (R): 0.03 in / 0.800 mm. Maximum cup backface fillet radius cleared (r): 0.06 in / 1.5 mm. Cage location relative to cone backface (Aa): 0.10 in / 2.5 mm. Effective centre location (a): −0.08 in / −2 mm, inside the cone backface.

TDO endplay is ground in at the factory as a controlled cone backface stack height.

Interchange guidance

Cross-references: K43096/43319D, 43096/43319D, 43096-43319D, 43096 43319D, 43319D, 43319-D, K43096-43319D. Components: cone 43096, double cup 43319D. Related: 43096/43319 (single row), 43319 (single cup). Because these are standard inch numbers, Timken, NSK, Koyo and others catalogue the same designation.