Timken453DW-3Tapered Roller Bearing Double Cup – 4.5000 in Outside Diameter, 2.1875 in Outer Ring Width, Class 3 Precision, Two Raceways On One Ring, TDO Service

Product Description

What this part is

Timken 453DW *3 inch tapered roller bearing double cup. Cup only. Manufacturer: Timken. Manufacturer Part Number: 453DW-3. Cup Part Number: 453DW. Base Number: 453. Series: 453. Bearing Type: Tapered Roller Bearing Double Cup. Number of Rows: 2. Rolling Elements: Tapered Rollers. Design Units: Inch. Outside Diameter: 4.5000 in (114.300 mm). Outer Ring Width: 2.1875 in (55.563 mm). Precision Class: Class 3. Item Weight: 7.6 lb (3.449 kg). Unit Quantity: 1 Pc. The mating cone is the Timken 455.

Decoding the designation

453 is the cup number in Timken’s 453 inch series. The D marks a DOUBLE CUP: one outer ring machined with two tapered raceways, which takes two separate cones. The W is a Timken design-variant letter on the cup. The trailing 3, written -3, *3 or #3, is Precision Class 3. Class 3 holds a tighter running-accuracy tolerance than standard, which gives lower running vibration and closer housing location. Searchable forms of the number are 453DW-3, 453DW *3, 453 D W #3, 453-D-W and 453DW.

What these specs mean in practice

e Factor: 0.71. K Factor: 1.74. Y1 Factor: 0.96. Y2 Factor: 1.42. Geometry Factor Cg: 0.0946. The K factor of 1.74 sets the ratio of radial to thrust capacity for this raceway geometry. The e factor of 0.71 is the load-ratio threshold at which the thrust term enters the equivalent-load calculation, and the two Y factors apply to the loaded and unloaded rows of the two-row arrangement. A double cup holds both raceways in a single outer ring, so the row spacing is fixed by the ring rather than set by shimming at assembly, and that fixed spread is what gives a TDO arrangement its resistance to overturning moment. The TDO can be clamped in the housing or left free to float in the bore. Harmonization Code: 8482.20.00.

Mounting dimensions

Maximum Housing Fillet Radius: 0.03 in (0.8 mm). Housing Backing Shoulder Diameter, frontface (Da): 3.96 in (100.58 mm). These are the figures that decide whether a given housing step and fillet will clear the cup corners.

Quantity and configuration

Unit Quantity: 1 Pc. Double cup only: one outer ring carrying both tapered raceways. The cup is the outer race alone, and its two raceway angles are cut to match the mating cones.

Cone and cup mating

A D suffix on a cup marks a double cup, and it takes two cones, one per raceway. The mating cone for the 453 cup series is the Timken 455, which carries a 2.0000 in bore and a 1.1542 in cone width. This is the mirror of the cone convention, where a D on a cone number marks a one-piece double cone that takes two single cups.

Interchange guidance

A standard-tolerance 453DW shares the same outside diameter, outer ring width and raceway geometry, so it is dimensionally interchangeable, but it holds a wider running-accuracy tolerance than this Class 3 cup. The single cups 453, 453A, 453B and 453X carry one raceway each on the same series and are related parts rather than substitutes for a double cup.