Timken469-3/452DC-3Class 3 Precision TDO Two-Row Tapered Roller Bearing – 2-1/4 in Bore, 4.25 in OD, 2.5625 in Width, Case-Carburized Steel

Product Description

What this part is

Brand: Timken. Assembly designation: 469/452DC. Product type: TDO two-row tapered roller bearing. TDO stands for Tapered Double Outer. Series: 455. Design units: imperial. A TDO is two cones running in one double cup. Cone: Timken 469. Double cup: Timken 452DC. Precision class: Timken Class 3, marked -3 and #3 on both halves.

Decoding the designation

469 is the cone number. 452DC is the double cup number. DC marks a double cup, a one-piece outer ring with two raceways that seats two cones. Timken designates this assembly 469/452DC. Class 3 holds tighter bore, outside diameter, width and running-accuracy tolerances than standard tolerance, which gives lower radial and axial runout and less vibration in service.

Dimensions

Bore, d: 2 1/4 in (57.150 mm). Outside diameter, D: 4.25 in (107.95 mm). Assembly width, T: 2.5625 in (65.088 mm). Outer ring width, C: 2.1250 in (53.975 mm). Inner ring width, B: 1.1542 in (29.317 mm). Weight: 5.38 lb (2.442 kg).

Load ratings

Dynamic radial rating, C1: 62,900 lbf (280,000 N). Dynamic radial rating at 90 million revolutions, C90, two-row assembly: 16,300 lbf (72,600 N). Dynamic radial rating at 90 million revolutions, C90, per row: 9,370 lbf (41,700 N). Dynamic thrust rating at 90 million revolutions, Ca90: 5,380 lbf (23,900 N).

Bearing factors

e: 0.34. K: 1.74. Y1: 2.01. Y2: 3. Cg: 0.0946.

Fitting notes

Housing backing diameter, Da: 3.96 in (100.58 mm). Shaft backing diameter, db: 2.83 in (72 mm). Maximum shaft fillet radius: 0.14 in. Maximum housing fillet radius: 0.03 in. Cage location, Aa: 0.07 in. Effective centre location: –0.28 in, inside the cone backface. Material: case-carburized alloy steel with ground raceways. Closure: open. Bore form: straight. Rolling elements: tapered rollers. Number of rows: 2.

What these specs mean in practice

A TDO takes thrust in both directions. It is mounted with the double cup clamped in the housing and the two cones on the shaft, and its bench-end play is set at the outer ring. K 1.74 and e 0.34 are the load factors for this bearing: it carries high radial load with moderate thrust capacity.

Interchange guidance

Timken 469 is the cone number for this assembly. Timken 452DC is the double cup number. Timken 452 is the single cup on the same 4.25 in outside diameter and is a related size. Timken 455/452D, 458/452D, 464/452D and 467/452D are related sizes on the same 4.25 in outside diameter with different bores. Searchable forms of this designation: 469/452DC, 469-452DC, 469 452DC, 469#3, 469-3, 452DC#3, 452DC-3, Class 3, *3, #3.