Timken72200Tapered Roller Bearing Cone, 2 in. Bore, 1.2910 in. Inner Ring Width, Steep-Angle High-Thrust Imperial Series

Product Description

What this part is

A single-row imperial tapered roller bearing cone in the 72200 size — the inner ring complete with its tapered rollers and cage, forming the shaft-side half of a two-piece TS single-row tapered bearing. Cone only. The matching cup is the Timken 72487, with the 72500 as the second published pairing.

Decoding the designation

72200 is an inch-series number in the ANSI/ABMA interchange scheme, so the digits define the cone geometry and the same number is used by other inch-series makers. The 72200 sits in Timken’s steep-angle number block: cone numbers in the 722xx group pair with cups in the 724xx and 725xx groups, which is why the mating cup is a 72487 rather than a number close to 72200.

What these specs mean in practice

The K factor of 0.79 is unusually low, indicating a steep cup angle. The consequence is visible in the ratings: the published thrust rating Ca90 of 12,100 lbf exceeds the radial rating C90 of 9,620 lbf, so the 72200/72487 is a thrust-dominant tapered bearing suited to positions where axial load is the governing case — pinion heads, screw jacks, kiln and mill trunnions. A steeper angle trades speed capability for that thrust capacity. The effective centre lies 0.05 in. outside the cone backface rather than inside it, which is characteristic of the steep-angle geometry and matters when calculating effective span for an opposed pair.

Published ratings and mounting data

Bore (d): 2 in. (50.8 mm)
Inner ring width (B): 1.2910 in. (32.791 mm)
Dynamic radial rating C1, matched 72200/72487 assembly: 37,100 lbf (165,000 N)
Dynamic radial rating C90, matched 72200/72487 assembly: 9,620 lbf (42,800 N)
Dynamic thrust rating Ca90, matched assembly: 12,100 lbf (54,000 N)
Static radial rating C0, matched assembly: 39,400 lbf (175,000 N)
K factor: 0.79
Maximum shaft fillet radius: 0.14 in. (3.600 mm)
Shaft backing shoulder diameter: 2.59 in. frontface, 2.91 in. backface
Cone weight: 9.77 lb (4.429 kg)

Quantity and configuration

One cone assembly, sold individually. Single row, tapered rollers, steel cage, straight bore, no snap ring.

Fitting notes

The cone takes an interference fit on the shaft and is driven from the backface against the shoulder, with the load path through the inner ring rather than through the cage or rollers. Endplay or preload is set once the cup is seated in the housing bore. Grease or oil lubrication both suit the geometry.

Interchange guidance

72200 interchanges directly across Timken, SKF, FAG (as K-72200), NTN and Koyo because the inch-series number defines the geometry. The 72212 and 72225 are related sizes in the same block with different bore and width and are separate parts.