Timken455-3Tapered Roller Bearing Cone, 2.0000 in Bore, 1.1542 in Cone Width, Class 3 Precision, Case-Carburized Steel

Product Description

What this part is

A Timken 455-3 single tapered roller bearing cone in Class 3 precision — the inner ring complete with its tapered roller set and cage, as one non-separable unit. Brand: Timken. Part Number: 455-3. Cone Part Number: 455. Base Number: 455. Series: Timken imperial TS tapered single, 450 sequence. Bore: 2.0000 in / 50.800 mm. Cone Width: 1.1542 in. Number Of Rows: 1. Precision Class: Timken Class 3. Bearing Class: Class 3. Bearing Material: Case-carburized steel. Cage Type: Stamped, roller-guided. Cage Material: Steel. Closure Type: Open. Cone Backface To-Clear Radius: 0.14 in. Cone Frontface Backing Diameter: 1.95 in. Cage-Cone Frontface Clearance: 0.08 in. Cage-Cone Backface Clearance: 0.07 in. Effective Center Location: -0.28 in. Design Units: Imperial (inch). Harmonization Code: 8482.20.00.

Decoding the designation

455: Timken imperial TS (tapered single) cone part number, 2.0000 in bore. -3: Timken precision Class 3, a tighter bore, width and runout grade than the standard Class 4 / K tolerance. The carton often stamps the class with a leading asterisk, so the same part appears as 455 *3, 455-3 and 4553.

What these specs mean in practice

Tapered roller bearings carry heavy combined radial and thrust load because the roller, cone raceway and cup raceway apexes meet at a common point — that geometry lets one bearing take thrust in one direction while supporting a large radial load. They are fitted in opposed pairs so the pair locates the shaft both ways and the setting, endplay or preload, is adjustable at assembly. Class 3 earns its price where the bearing sets a gear mesh or a machine tool spindle: tighter runout means less variation in the dialled-in setting and less pattern shift on the gear teeth.

Quantity and configuration

Cone only — inner ring, rollers and cage as one non-separable unit. Unit Quantity: 1 Pc. Mating cups: Timken 453, 453A, 453B, 453X, 454 and 4536. The common assembly is 455/453X, which measures 2.0000 in bore x 4.1250 in outside diameter x 1.1875 in overall width (T), with a 0.9687 in cup width.

Interchange guidance

The 455 cone is catalogued against Timken cups 453, 453A, 453B, 453X, 454 and 4536. Inch tapered roller numbering is an industry standard rather than a brand code, so the same-envelope cone carries the same number from other makers: Koyo 455, NTN 455, SKF 455, Bower / BCA 455 and Federal-Mogul 455. A plain 455 without the -3 suffix is the same envelope in standard Class 4 / K precision and is a fit-for-fit substitute where the tighter class is not called out; a -3 cone fits any standard 455 application.