Timken478WTapered Roller Bearing Cone – 2.5591 in Bore, 1.1420 in Inner Ring Width, Straight Bore, Pressed Steel Cage, Mates With 472, 472A And 474 Cups

Product Description

What this part is:

Timken 478W inch tapered roller bearing cone, 1 Pc. Cone only: the inner ring with its tapered roller set and pressed steel cage, one non-separable assembly. Matching single cups are Timken 472, 472A and 474.

Decoding the designation:

478 — cone number in Timken’s 475 inch series.

W — Timken design-variant letter on the cone; the 478W is a distinct part from the plain 478 with its own published dimensions and ratings.

Specifications:

Manufacturer Part Number: 478W. Base Number: 478. Series: 475. Bearing Type: Tapered Roller Bearing Cone. Number of Rows: 1. Rolling Elements: Tapered Rollers. Design Units: Inch. Bore: 2.5591 in (65.001 mm). Inner Ring Width: 1.1420 in (29.007 mm). Bore Type: Straight. Closure Type: Open. Cage Type: Pressed steel. Cage Material: Steel. Bearing Material: Case-Carburized Steel. Item Weight: 8.05 lb (3.652 kg). Dynamic Radial Load Rating C1, per row, ISO method at 1 million revolutions: 30,500 lbf (135,000 N). Dynamic Radial Load Rating C90, per row, Timken method at 90 million revolutions: 7,890 lbf (35,100 N). Dynamic Axial Rating Ca90, per row: 5,200 lbf (23,100 N). Static Radial Load Rating C0: 41,900 lbf (186,000 N). K Factor: 1.52. G1 Factor: 77.2. G2 Factor: 23. Geometry Factor Cg: 0.108. Maximum Temperature: 120 °C. Minimum Temperature: −54 °C. Harmonization Code: 8482.20.00. Unit Quantity: 1 Pc.

Dimensions and mounting:

Effective Center Location: −0.16 in (−4.1 mm), inside the cone backface. Maximum Shaft Fillet Radius: 0.09 in (2.3 mm). Shaft Backing Shoulder Diameter, frontface (da): 2.87 in (73 mm). Shaft Backing Shoulder Diameter, backface (db): 3.03 in (77 mm). Cage Location relative to the backface (Aa): 0.04 in (1 mm). Cage Location relative to the frontface (Ab): 0.12 in (3 mm).

Compatibility and replacement:

Mating cups: Timken 472, 472A and 474, giving the single-row assemblies 478W/472, 478W/472A and 478W/474. Cross-Reference 1: SKF 478 (related, plain 478 cone). Cross-Reference 2: NTN 4T-478 (related, plain 478 cone). Cross-Reference 3: Bower 478 (related, plain 478 cone). The plain 478 shares the series and bore and is a separate Timken part number. MPN Variants: 478W, 478-W, 478 W, 478.

Frequently asked questions:

What size is the Timken 478W cone?

Bore: 2.5591 in (65.001 mm). Inner Ring Width: 1.1420 in (29.007 mm).

Which cups mate with the 478W?

Timken 472, 472A and 474, giving the assemblies 478W/472, 478W/472A and 478W/474.

What is the dynamic load rating?

C1: 30,500 lbf (135,000 N) per row. C90: 7,890 lbf (35,100 N) per row.