Timken98316/98788Tapered Roller Bearing Cone & Cup Set – 3.1496 in (80 mm) Bore, 7.874 in (200 mm) OD, 2.0772 in Total Width

Product Description

What this part is

A Timken TS single-row tapered roller bearing set: one 98316 cone and one 98788 cup. The 98316 is the cone, the inner ring with its roller and cage assembly. The 98788 is the cup, the outer ring. Together they form a complete single-row bearing on a 3.1496 in (80 mm) bore and a 7.874 in (200 mm) outside diameter, 2.0772 in (52.761 mm) assembled width.

Decoding the designation

The 98000 series sets the envelope. Timken writes single-row TS bearings as cone number followed by cup number, so 98316/98788 names the two halves of one bearing rather than two alternatives. Cone inner ring width B is 1.9375 in (49.213 mm) and cup outer ring width C is 1.375 in (34.925 mm); the assembled width T is less than their sum because the cone seats inside the cup raceway.

What these specs mean in practice

The e factor is 0.63, the K factor 0.92 and the Y factor 0.95. A K factor of 0.92 is a steep taper, meaning this bearing is thrust-biased: it carries a large axial component relative to its radial rating, which is why the axial and radial 90-million-revolution figures sit so close together at 30,400 lbf and 28,100 lbf. Geometry factor Cg is 0.120, G1 is 203.4 and G2 is 37.5.

Ratings

Single-row values, per row. Dynamic radial load rating at one million revolutions, C1, is 108,000 lbf (482,000 N). Dynamic radial rating at ninety million revolutions, C90, is 28,100 lbf (125,000 N). Dynamic axial rating Ca90 is 30,400 lbf (135,000 N). Static radial load rating C0 is 117,000 lbf (519,000 N).

Fitting notes

Maximum shaft fillet radius is 0.14 in (3.6 mm) and maximum housing fillet radius 0.130 in (3.30 mm). Shaft backing shoulder diameters are 4.13 in (105 mm) at the frontface and 4.37 in (111 mm) at the backface. Housing backing shoulder diameters are 7.41 in (188.00 mm) frontface and 6.85 in (173.99 mm) backface. Effective centre location is 0.05 in (1.3 mm). Cage location relative to the backface is 0.31 in and to the frontface 0.24 in.

Quantity and configuration

Two pieces: one 98316 cone and one 98788 cup, forming one complete single-row bearing. Case-carburized alloy steel, stamped steel cage, open, straight bore. Set weight 17.50 lb (7.9 kg).

Interchange guidance

The cup 98788-SA is a related size on the same envelope with a modified profile and is a separate Timken part number. Mounting two of these bearings in opposition on one shaft carries axial load in both directions.