Timken29580/29526DTapered Roller Bearing TDO Two-Row Assembly – 2.3622 in Bore, 4.4375 in Outside Diameter, 2.1874 in Overall Width, Class 3, Case-Carburized Steel.

Product Description

What this part is

Timken 29580/29526D Class 3 TDO two-row tapered roller bearing assembly, 29500 series. Bore Diameter: 2.3622 in (60 mm). Outside Diameter: 4.4375 in (112.713 mm). Overall Width: 2.1874 in (55.56 mm). Number Of Rows: 2. Rolling Elements: Tapered Roller. Bore Type: Straight. Closure Type: Open. Precision Class: Class 3. Bearing Material: Case-carburized steel. Item Weight: 2.301 kg (5.07 lb). Lubricant: Grease or oil.

Decoding the designation

29580 — the cone number, an inch tapered roller bearing inner ring with its rollers and cage, 2.3622 in bore, 1.0000 in (25.400 mm) wide.

29526D — the cup number with a D suffix. A D on a cup means a double cup: one outer ring carrying two raceways back to back, 4.4375 in outside diameter, 1.6875 in (42.863 mm) wide.

TDO — Tapered Double Outer. Two cones run on the shaft either side of one double cup, which gives a single fixed-position bearing seat that takes thrust in both directions.

Class 3 — Timken precision Class 3, marked on the box as ∗3. Tighter bore, outside diameter and running-accuracy tolerances than standard, giving lower running vibration and closer shaft location.

What these specs mean in practice

Dynamic Radial Load Rating, two-row (C90-2row): 58,900 N (13,200 lbf). Dynamic Load Rating (C1, one million revolutions): 227,000 N (51,100 lbf). Dynamic Axial Rating (Ca90): 26,600 N (5,970 lbf).

K Factor: 1.27. e Factor: 0.46. Y1 Factor: 1.47. Y2 Factor: 2.19. Geometry Factor (Cg): 0.111. These are the Timken factors used to resolve a combined radial and thrust duty into an equivalent radial load and to adjust calculated life for the lubricant film.

The wide effective spread between the two rows makes a TDO stiff in overturning moment, which is why the arrangement is used on pinion shafts, speed reducers, gearbox output shafts and heavy industrial drives.

Case-carburized steel gives a hard raceway over a tough core, so the assembly takes shock loading without through-cracking.

Mounting data

Shaft Backing Shoulder Diameter (db): 2.95 in (75 mm). Housing Backing Shoulder Diameter (Da): 4.15 in (105.40 mm). Maximum Shaft Fillet Radius: 0.14 in (3.6 mm). Maximum Housing Fillet Radius: 0.03 in (0.8 mm) — these are the largest fillets the mating shaft and housing may carry and still be cleared by the bearing corners. Effective Center Location: -0.03 in (-0.8 mm).

The double cup seats in the housing bore and locates axially against the housing shoulder; the two cones press onto the shaft either side of it.

Quantity and configuration

Unit Quantity: 3 Pcs. Two 29580 cones and one 29526D double cup, supplied as the matched factory assembly in its Timken precision box.

Interchange guidance

The component numbers 29580 and 29526D are inch tapered roller bearing designations that SKF, NTN, Koyo, NSK and Bower also build to the same envelope at standard precision. Class 3 is the Timken precision grade of this assembly. Written variants in circulation include 29580/29526D, 29580-29526D, 29580 29526D #3 and 29580/29526-D.